From e7c014d701416dd014c305cb0d94c1781d8f9490 Mon Sep 17 00:00:00 2001
From: joaqo <joaquin.alori@gmail.com>
Date: Fri, 12 Feb 2021 00:30:01 -0300
Subject: [PATCH 01/14] Remove motmetrics (which adds pandas) and opencv as
 dependencies

Add them as extra dependencies, adjust code to return pretty error
messages when imports fail, and update documentation.
---
 README.md                          | 10 +++++++++-
 demos/alphapose/README.md          |  5 +++--
 demos/detectron2/README.md         |  5 +++--
 demos/motmetrics4norfair/README.md |  7 ++++---
 demos/openpose/README.md           |  5 +++--
 demos/yolov4/README.md             |  5 +++--
 norfair/drawing.py                 |  7 +++++--
 norfair/metrics.py                 |  6 +++++-
 norfair/utils.py                   | 11 +++++++++++
 norfair/video.py                   |  7 +++++--
 pyproject.toml                     | 12 ++++++++----
 11 files changed, 59 insertions(+), 21 deletions(-)

diff --git a/README.md b/README.md
index 52e213d5..28a8831a 100644
--- a/README.md
+++ b/README.md
@@ -20,12 +20,20 @@ Norfair is built, used and maintained by [Tryolabs](https://tryolabs.com).
 
 ## Installation
 
-Norfair currently supports Python 3.6+.
+Norfair currently supports Python 3.7+.
 
+For pure python version that works anywhere install as:
 ```bash
 pip install norfair
 ```
 
+For more features install as:
+```bash
+pip install norfair[metrics]  # Supports running MOT metrics evaluation
+pip install norfair[video]  # Adds several video helper features running on OpenCV
+pip install norfair[metrics,video]  # Everything included
+```
+
 ## How it works
 
 Norfair works by estimating the future position of each point based on its past positions. It then tries to match these estimated positions with newly detected points provided by the detector. For this matching to occur, Norfair can rely on any distance function specified by the user of the library. Therefore, each object tracker can be made as simple or as complex as needed.
diff --git a/demos/alphapose/README.md b/demos/alphapose/README.md
index fc2439a7..c8b51a0f 100644
--- a/demos/alphapose/README.md
+++ b/demos/alphapose/README.md
@@ -4,8 +4,9 @@ An example of how to integrate Norfair into the video inference loop of a pre ex
 
 ## Instructions
 
-1. [Follow the instructions](https://github.com/MVIG-SJTU/AlphaPose/tree/pytorch#installation) to install the Pytorch version of AlphaPose.
-2. Apply this diff to this [commit](https://github.com/MVIG-SJTU/AlphaPose/commit/ded84d450faf56227680f0527ff7e24ab7268754) on AlphaPose and use their [video_demo.py](https://github.com/MVIG-SJTU/AlphaPose/blob/ded84d450faf56227680f0527ff7e24ab7268754/video_demo.py) to process your video.
+1. Install norfair with `pip install norfair[video]`.
+2. [Follow the instructions](https://github.com/MVIG-SJTU/AlphaPose/tree/pytorch#installation) to install the Pytorch version of AlphaPose.
+3. Apply this diff to this [commit](https://github.com/MVIG-SJTU/AlphaPose/commit/ded84d450faf56227680f0527ff7e24ab7268754) on AlphaPose and use their [video_demo.py](https://github.com/MVIG-SJTU/AlphaPose/blob/ded84d450faf56227680f0527ff7e24ab7268754/video_demo.py) to process your video.
 
     ```diff
     diff --git a/dataloader.py b/dataloader.py
diff --git a/demos/detectron2/README.md b/demos/detectron2/README.md
index 026bace4..20a8786d 100644
--- a/demos/detectron2/README.md
+++ b/demos/detectron2/README.md
@@ -6,8 +6,9 @@ Simplest possible example of tracking. Based on [Detectron2](https://github.com/
 
 Assuming Norfair is installed:
 
-1. [Follow the instructions](https://detectron2.readthedocs.io/tutorials/install.html) to install Detectron2.
-2. Run `python detectron2_cars.py`. For the demo, we are using [this traffic footage](https://www.youtube.com/watch?v=aio9g9_xVio).
+1. Install norfair with `pip install norfair[video]`.
+2. [Follow the instructions](https://detectron2.readthedocs.io/tutorials/install.html) to install Detectron2.
+3. Run `python detectron2_cars.py`. For the demo, we are using [this traffic footage](https://www.youtube.com/watch?v=aio9g9_xVio).
 
 ## Explanation
 
diff --git a/demos/motmetrics4norfair/README.md b/demos/motmetrics4norfair/README.md
index 814defcc..93511e6b 100644
--- a/demos/motmetrics4norfair/README.md
+++ b/demos/motmetrics4norfair/README.md
@@ -3,7 +3,8 @@ Demo on how to evaluate a Norfair tracker on the [MOTChallenge](https://motchall
 
 ## Instructions
 
-1. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running
+1. Install norfair with `pip install norfair[metrics,video]`.
+2. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running
 
 ```bash
 curl -O https://motchallenge.net/data/MOT17.zip  # To download Detections + Ground Truth + Images (5.5GB)  
@@ -18,7 +19,7 @@ unzip MOT17Labels.zip
 
 Given that the ground truth files for the testing set are not publicly available, you will only be able to use motmetrics4norfair with the training set.
 
-2. Display the motmetrics4norfair instructions: 
+3. Display the motmetrics4norfair instructions: 
 ```bash
     python motmetrics4norfair.py --help 
-``` 
\ No newline at end of file
+``` 
diff --git a/demos/openpose/README.md b/demos/openpose/README.md
index 51ff7be7..ed332b86 100644
--- a/demos/openpose/README.md
+++ b/demos/openpose/README.md
@@ -4,8 +4,9 @@ Demo for extrapolating detections through skipped frames. Based on [OpenPose](ht
 
 ## Instructions
 
-1. Install [OpenPose version 1.4](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.4.0).
-2. Run `python openpose_extrapolation.py`.
+1. Install norfair with `pip install norfair[video]`.
+2. Install [OpenPose version 1.4](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.4.0).
+3. Run `python openpose_extrapolation.py`.
 
 ## Explanation
 
diff --git a/demos/yolov4/README.md b/demos/yolov4/README.md
index cbcd7e61..a2960edf 100644
--- a/demos/yolov4/README.md
+++ b/demos/yolov4/README.md
@@ -4,8 +4,9 @@ Simplest possible example of tracking. Based on [pytorch YOLOv4](https://github.
 
 ## Instructions
 
-1. Clone [pytorch YOLOv4](https://github.com/Tianxiaomo/pytorch-YOLOv4/tree/master) and download the [weights](https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ) published on the repo into your local clone of the repo.
-2. Copy `yolov4demo.py` into your local clone of the repo and run `python yolov4demo.py <video file>`.
+1. Install norfair with `pip install norfair[video]`.
+2. Clone [pytorch YOLOv4](https://github.com/Tianxiaomo/pytorch-YOLOv4/tree/master) and download the [weights](https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ) published on the repo into your local clone of the repo.
+3. Copy `yolov4demo.py` into your local clone of the repo and run `python yolov4demo.py <video file>`.
 
 ## Explanation
 
diff --git a/norfair/drawing.py b/norfair/drawing.py
index 5bdf1caa..4e9e8123 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -1,6 +1,9 @@
 from typing import Optional, Tuple, Sequence
-
-import cv2
+try:
+    import cv2
+except:
+    from utils import DummyOpenCVImport
+    cv2 = DummyOpenCVImport()
 import numpy as np
 import random
 
diff --git a/norfair/metrics.py b/norfair/metrics.py
index 05fb37e8..39140c6b 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -3,7 +3,11 @@
 from rich import print
 from rich.progress import track
 from norfair import Detection
-import motmetrics as mm
+try:
+    import motmetrics as mm
+except:
+    from utils import DummyMOTMetricsImport
+    mm = DummyMOTMetricsImport()
 from collections import OrderedDict
 import pandas as pd
 
diff --git a/norfair/utils.py b/norfair/utils.py
index 49a3a0dd..eb2df4bd 100644
--- a/norfair/utils.py
+++ b/norfair/utils.py
@@ -68,3 +68,14 @@ def get_cutout(points, image):
     max_y = int(max(points[:, 1]))
     min_y = int(min(points[:, 1]))
     return image[min_y:max_y, min_x:max_x]
+
+
+class DummyOpenCVImport:
+    def __getattribute__(self, name):
+        print("You are trying to use Norfair's video features. Install with `pip install norfair\[video]`, or install opencv-python manually.")
+        exit()
+
+class DummyMOTMetricsImport:
+    def __getattribute__(self, name):
+        print("You are trying to use Norfair's metrics features. Install with `pip install norfair\[metrics]`, or install motmetrics manually.")
+        exit()
diff --git a/norfair/video.py b/norfair/video.py
index c4aa3bde..a34ba571 100644
--- a/norfair/video.py
+++ b/norfair/video.py
@@ -1,8 +1,11 @@
 import os
 import time
 from typing import Optional, List, Union
-
-import cv2
+try:
+    import cv2
+except ImportError:
+    from utils import DummyOpenCVImport
+    cv2 = DummyOpenCVImport()
 import numpy as np
 from rich import print
 from rich.progress import BarColumn, Progress, TimeRemainingColumn, ProgressColumn
diff --git a/pyproject.toml b/pyproject.toml
index d7a5889d..68e0247d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "norfair"
-version = "0.1.8"
+version = "0.2.0"
 description = "Lightweight Python library for real-time 2D object tracking."
 license = "BSD-3-Clause"
 authors = ["Tryolabs <hello@tryolabs.com>"]
@@ -8,11 +8,15 @@ repository = "https://github.com/tryolabs/norfair"
 readme = "README.md"
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.7"
 filterpy = "^1.4.5"
 rich = "^6.1.1"
-opencv-python = ">= 3.2.0, < 5.0.0"
-motmetrics = "1.2.0"
+opencv-python = {version = ">= 3.2.0, < 5.0.0", optional = true}
+motmetrics = {version = "1.2.0", optional = true}
+
+[tool.poetry.extras]
+metrics = ["motmetrics"]
+video = ["opencv-python"]
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.0.1"

From 6668e2a7a3e308ed4b8cd4cf81d54090357de306 Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 14:41:16 -0300
Subject: [PATCH 02/14] Changes in README files.

---
 README.md                          | 12 ++++++----
 demos/alphapose/README.md          |  2 +-
 demos/motmetrics4norfair/README.md | 35 ++++++++++++++++--------------
 demos/openpose/README.md           |  2 +-
 demos/yolov4/README.md             |  2 +-
 5 files changed, 30 insertions(+), 23 deletions(-)

diff --git a/README.md b/README.md
index 28a8831a..0c8ed01d 100644
--- a/README.md
+++ b/README.md
@@ -22,15 +22,19 @@ Norfair is built, used and maintained by [Tryolabs](https://tryolabs.com).
 
 Norfair currently supports Python 3.7+.
 
-For pure python version that works anywhere install as:
+For the pure version with minimal Python dependencies, install as:
+
 ```bash
 pip install norfair
 ```
 
-For more features install as:
+Note that this will NOT install OpenCV, which is needed for video aplications. Therefore, you need to make sure Norfair runs in an environment with an existing OpenCV installation.
+
+To make Norfair install the dependencies to support more features, install as:
+
 ```bash
-pip install norfair[metrics]  # Supports running MOT metrics evaluation
 pip install norfair[video]  # Adds several video helper features running on OpenCV
+pip install norfair[metrics]  # Supports running MOT metrics evaluation
 pip install norfair[metrics,video]  # Everything included
 ```
 
@@ -122,4 +126,4 @@ If you are interested, please [contact us](https://tryolabs.com/#contact).
 
 ## License
 
-Copyright © 2020, [Tryolabs](https://tryolabs.com). Released under the [BSD 3-Clause](LICENSE).
+Copyright © 2021, [Tryolabs](https://tryolabs.com). Released under the [BSD 3-Clause](LICENSE).
diff --git a/demos/alphapose/README.md b/demos/alphapose/README.md
index c8b51a0f..f019d3e5 100644
--- a/demos/alphapose/README.md
+++ b/demos/alphapose/README.md
@@ -4,7 +4,7 @@ An example of how to integrate Norfair into the video inference loop of a pre ex
 
 ## Instructions
 
-1. Install norfair with `pip install norfair[video]`.
+1. Install Norfair with `pip install norfair[video]`.
 2. [Follow the instructions](https://github.com/MVIG-SJTU/AlphaPose/tree/pytorch#installation) to install the Pytorch version of AlphaPose.
 3. Apply this diff to this [commit](https://github.com/MVIG-SJTU/AlphaPose/commit/ded84d450faf56227680f0527ff7e24ab7268754) on AlphaPose and use their [video_demo.py](https://github.com/MVIG-SJTU/AlphaPose/blob/ded84d450faf56227680f0527ff7e24ab7268754/video_demo.py) to process your video.
 
diff --git a/demos/motmetrics4norfair/README.md b/demos/motmetrics4norfair/README.md
index 93511e6b..a2066597 100644
--- a/demos/motmetrics4norfair/README.md
+++ b/demos/motmetrics4norfair/README.md
@@ -1,25 +1,28 @@
 # Compute MOTChallenge metrics
+
 Demo on how to evaluate a Norfair tracker on the [MOTChallenge](https://motchallenge.net).
 
 ## Instructions
 
-1. Install norfair with `pip install norfair[metrics,video]`.
-2. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running
+1. Install Norfair with `pip install norfair[metrics,video]`.
+2. Download the [MOT17](https://motchallenge.net/data/MOT17/) dataset running:
+
+    ```bash
+    curl -O https://motchallenge.net/data/MOT17.zip  # To download Detections + Ground Truth + Images (5.5GB)
+    unzip MOT17.zip
+    ```
+
+    or
 
-```bash
-curl -O https://motchallenge.net/data/MOT17.zip  # To download Detections + Ground Truth + Images (5.5GB)  
-unzip MOT17.zip
- ``` 
-or
+    ```bash
+    curl -O https://motchallenge.net/data/MOT17Labels.zip  # To download Detections + Ground Truth (9.7 MB)
+    unzip MOT17Labels.zip
+    ```
 
-```bash
-curl -O https://motchallenge.net/data/MOT17Labels.zip  # To download Detections + Ground Truth (9.7 MB)  
-unzip MOT17Labels.zip
-``` 
+    Given that the ground truth files for the testing set are not publicly available, you will only be able to use motmetrics4norfair with the training set.
 
-Given that the ground truth files for the testing set are not publicly available, you will only be able to use motmetrics4norfair with the training set.
+3. Display the instructions:
 
-3. Display the motmetrics4norfair instructions: 
-```bash
-    python motmetrics4norfair.py --help 
-``` 
+    ```bash
+    python motmetrics4norfair.py --help
+    ```
diff --git a/demos/openpose/README.md b/demos/openpose/README.md
index ed332b86..2439c7a5 100644
--- a/demos/openpose/README.md
+++ b/demos/openpose/README.md
@@ -4,7 +4,7 @@ Demo for extrapolating detections through skipped frames. Based on [OpenPose](ht
 
 ## Instructions
 
-1. Install norfair with `pip install norfair[video]`.
+1. Install Norfair with `pip install norfair[video]`.
 2. Install [OpenPose version 1.4](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.4.0).
 3. Run `python openpose_extrapolation.py`.
 
diff --git a/demos/yolov4/README.md b/demos/yolov4/README.md
index a2960edf..872a40e6 100644
--- a/demos/yolov4/README.md
+++ b/demos/yolov4/README.md
@@ -4,7 +4,7 @@ Simplest possible example of tracking. Based on [pytorch YOLOv4](https://github.
 
 ## Instructions
 
-1. Install norfair with `pip install norfair[video]`.
+1. Install Norfair with `pip install norfair[video]`.
 2. Clone [pytorch YOLOv4](https://github.com/Tianxiaomo/pytorch-YOLOv4/tree/master) and download the [weights](https://drive.google.com/open?id=1wv_LiFeCRYwtpkqREPeI13-gPELBDwuJ) published on the repo into your local clone of the repo.
 3. Copy `yolov4demo.py` into your local clone of the repo and run `python yolov4demo.py <video file>`.
 

From 1ea55d7a5d9bea4bc4b898d721266868bcc73a4a Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 14:52:11 -0300
Subject: [PATCH 03/14] Don't build Python 3.6 in CI.

---
 .github/workflows/ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c853b81..a5c62bce 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       max-parallel: 3
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
     steps:
       - uses: actions/checkout@v2
 

From dd32f7b10d1e8c82ff992da83d64f8d04cbba0bd Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:02:13 -0300
Subject: [PATCH 04/14] Improve error messages.

---
 norfair/utils.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/norfair/utils.py b/norfair/utils.py
index eb2df4bd..58ca0e57 100644
--- a/norfair/utils.py
+++ b/norfair/utils.py
@@ -72,10 +72,17 @@ def get_cutout(points, image):
 
 class DummyOpenCVImport:
     def __getattribute__(self, name):
-        print("You are trying to use Norfair's video features. Install with `pip install norfair\[video]`, or install opencv-python manually.")
+        print(
+            """[bold red]Missing dependency:[/bold red] you are trying to use Norfair's video features. However, OpenCV is not installed.
+
+Please, make sure there is an existing installation of OpenCV or install Norfair with `pip install norfair\[video]`."""
+        )
         exit()
 
+
 class DummyMOTMetricsImport:
     def __getattribute__(self, name):
-        print("You are trying to use Norfair's metrics features. Install with `pip install norfair\[metrics]`, or install motmetrics manually.")
+        print(
+            """[bold red]Missing dependency:[/bold red] you are trying to use Norfair's metrics features. Please, install Norfair with `pip install norfair\[metrics]`."""
+        )
         exit()

From cc996f368e69e952b1ec547da15c6043492fcc5a Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:05:37 -0300
Subject: [PATCH 05/14] Update all dependencies.

---
 poetry.lock    | 1039 +++++++++++++++++++++++++-----------------------
 pyproject.toml |   12 +-
 2 files changed, 550 insertions(+), 501 deletions(-)

diff --git a/poetry.lock b/poetry.lock
index c72d0e67..5a9dc18d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,121 +1,130 @@
 [[package]]
-category = "dev"
-description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
 name = "appdirs"
+version = "1.4.4"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.4"
 
 [[package]]
-category = "dev"
-description = "An abstract syntax tree for Python with inference support."
 name = "astroid"
+version = "2.4.2"
+description = "An abstract syntax tree for Python with inference support."
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "2.4.2"
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0,<1.5.0"
 six = ">=1.12,<2.0"
+typed-ast = {version = ">=1.4.0,<1.5", markers = "implementation_name == \"cpython\" and python_version < \"3.8\""}
 wrapt = ">=1.11,<2.0"
 
-[package.dependencies.typed-ast]
-python = "<3.8"
-version = ">=1.4.0,<1.5"
-
 [[package]]
-category = "main"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.0"
 
 [[package]]
-category = "main"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "20.3.0"
+description = "Classes Without Boilerplate"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.2.0"
 
 [package.extras]
-dev = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
-docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
-tests = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
-tests_no_zope = ["coverage (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "furo", "sphinx", "pre-commit"]
+docs = ["furo", "sphinx", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
 
 [[package]]
-category = "main"
-description = "Python package for providing Mozilla's CA Bundle."
-name = "certifi"
+name = "black"
+version = "20.8b1"
+description = "The uncompromising code formatter."
+category = "dev"
 optional = false
-python-versions = "*"
-version = "2020.6.20"
+python-versions = ">=3.6"
+
+[package.dependencies]
+appdirs = "*"
+click = ">=7.1.2"
+mypy-extensions = ">=0.4.3"
+pathspec = ">=0.6,<1"
+regex = ">=2020.1.8"
+toml = ">=0.10.1"
+typed-ast = ">=1.4.0"
+typing-extensions = ">=3.7.4"
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
 
 [[package]]
-category = "main"
-description = "Cross-platform colored terminal text."
-name = "colorama"
+name = "click"
+version = "7.1.2"
+description = "Composable command line interface toolkit"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
+name = "colorama"
+version = "0.4.4"
+description = "Cross-platform colored terminal text."
 category = "main"
-description = "Python parser for the CommonMark Markdown spec"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
 name = "commonmark"
+version = "0.9.1"
+description = "Python parser for the CommonMark Markdown spec"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.9.1"
 
 [package.extras]
-test = ["flake8 (3.7.8)", "hypothesis (3.55.3)"]
+test = ["flake8 (==3.7.8)", "hypothesis (==3.55.3)"]
 
 [[package]]
-category = "main"
-description = "Composable style cycles"
 name = "cycler"
+version = "0.10.0"
+description = "Composable style cycles"
+category = "main"
 optional = false
 python-versions = "*"
-version = "0.10.0"
 
 [package.dependencies]
 six = "*"
 
 [[package]]
-category = "main"
-description = "A backport of the dataclasses module for Python 3.6"
-marker = "python_version >= \"3.6\" and python_version < \"3.7\""
-name = "dataclasses"
-optional = false
-python-versions = ">=3.6, <3.7"
-version = "0.7"
-
-[[package]]
-category = "dev"
-description = "Distribution utilities"
 name = "distlib"
+version = "0.3.1"
+description = "Distribution utilities"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.3.1"
 
 [[package]]
-category = "dev"
-description = "A platform independent file lock."
 name = "filelock"
+version = "3.0.12"
+description = "A platform independent file lock."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "3.0.12"
 
 [[package]]
-category = "main"
-description = "Kalman filtering and optimal estimation library"
 name = "filterpy"
+version = "1.4.5"
+description = "Kalman filtering and optimal estimation library"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.4.5"
 
 [package.dependencies]
 matplotlib = "*"
@@ -123,114 +132,92 @@ numpy = "*"
 scipy = "*"
 
 [[package]]
-category = "main"
-description = "the modular source code checker: pep8 pyflakes and co"
 name = "flake8"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 version = "3.8.4"
+description = "the modular source code checker: pep8 pyflakes and co"
+category = "main"
+optional = true
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
 
 [package.dependencies]
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.6.0a1,<2.7.0"
 pyflakes = ">=2.2.0,<2.3.0"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = "*"
-
 [[package]]
-category = "main"
-description = "Flake8 and pylama plugin that checks the ordering of import statements."
 name = "flake8-import-order"
-optional = false
-python-versions = "*"
 version = "0.18.1"
+description = "Flake8 and pylama plugin that checks the ordering of import statements."
+category = "main"
+optional = true
+python-versions = "*"
 
 [package.dependencies]
 pycodestyle = "*"
-setuptools = "*"
 
 [[package]]
-category = "main"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "3.4.0"
+description = "Read metadata from Python packages"
+category = "main"
 optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.7.0"
+python-versions = ">=3.6"
 
 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["sphinx", "rst.linker"]
-testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "pytest-enabler", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
-category = "dev"
-description = "Read resources from Python packages"
-marker = "python_version < \"3.7\""
-name = "importlib-resources"
-optional = false
-python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.0.0"
-
-[package.dependencies]
-[package.dependencies.zipp]
-python = "<3.8"
-version = ">=0.4"
-
-[package.extras]
-docs = ["sphinx", "rst.linker", "jaraco.packaging"]
-
-[[package]]
-category = "main"
-description = "iniconfig: brain-dead simple config-ini parsing"
 name = "iniconfig"
+version = "1.1.1"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.0.1"
 
 [[package]]
-category = "dev"
-description = "A Python utility / library to sort Python imports."
 name = "isort"
+version = "5.7.0"
+description = "A Python utility / library to sort Python imports."
+category = "dev"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "5.5.1"
 
 [package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
 pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
 requirements_deprecated_finder = ["pipreqs", "pip-api"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
 
 [[package]]
-category = "main"
-description = "A fast implementation of the Cassowary constraint solver"
 name = "kiwisolver"
+version = "1.3.1"
+description = "A fast implementation of the Cassowary constraint solver"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "1.2.0"
 
 [[package]]
-category = "dev"
-description = "A fast and thorough lazy object proxy."
 name = "lazy-object-proxy"
+version = "1.4.3"
+description = "A fast and thorough lazy object proxy."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.3"
 
 [[package]]
-category = "main"
-description = "Python plotting package"
 name = "matplotlib"
+version = "3.3.4"
+description = "Python plotting package"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "3.3.1"
 
 [package.dependencies]
-certifi = ">=2020.06.20"
 cycler = ">=0.10"
 kiwisolver = ">=1.0.1"
 numpy = ">=1.15"
@@ -239,28 +226,20 @@ pyparsing = ">=2.0.3,<2.0.4 || >2.0.4,<2.1.2 || >2.1.2,<2.1.6 || >2.1.6"
 python-dateutil = ">=2.1"
 
 [[package]]
-category = "main"
-description = "McCabe checker, plugin for flake8"
 name = "mccabe"
-optional = false
-python-versions = "*"
 version = "0.6.1"
-
-[[package]]
+description = "McCabe checker, plugin for flake8"
 category = "main"
-description = "More routines for operating on iterables, beyond itertools"
-name = "more-itertools"
 optional = false
-python-versions = ">=3.5"
-version = "8.5.0"
+python-versions = "*"
 
 [[package]]
-category = "main"
-description = "Metrics for multiple object tracker benchmarking."
 name = "motmetrics"
-optional = false
-python-versions = "*"
 version = "1.2.0"
+description = "Metrics for multiple object tracker benchmarking."
+category = "main"
+optional = true
+python-versions = "*"
 
 [package.dependencies]
 flake8 = "*"
@@ -273,173 +252,181 @@ scipy = ">=0.19.0"
 xmltodict = ">=0.12.0"
 
 [[package]]
-category = "main"
-description = "NumPy is the fundamental package for array computing with Python."
-name = "numpy"
+name = "mypy-extensions"
+version = "0.4.3"
+description = "Experimental type system extensions for programs checked with the mypy typechecker."
+category = "dev"
 optional = false
-python-versions = ">=3.6"
-version = "1.19.1"
+python-versions = "*"
 
 [[package]]
+name = "numpy"
+version = "1.20.1"
+description = "NumPy is the fundamental package for array computing with Python."
 category = "main"
-description = "Wrapper package for OpenCV python bindings."
-name = "opencv-python"
 optional = false
-python-versions = ">=3.5"
-version = "4.4.0.42"
+python-versions = ">=3.7"
+
+[[package]]
+name = "opencv-python"
+version = "4.5.1.48"
+description = "Wrapper package for OpenCV python bindings."
+category = "main"
+optional = true
+python-versions = ">=3.6"
 
 [package.dependencies]
-numpy = ">=1.13.1"
+numpy = ">=1.17.3"
 
 [[package]]
-category = "main"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.9"
+description = "Core utilities for Python packages"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.4"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
-six = "*"
 
 [[package]]
-category = "main"
-description = "Powerful data structures for data analysis, time series, and statistics"
 name = "pandas"
-optional = false
-python-versions = ">=3.5.3"
-version = "0.25.3"
+version = "1.1.5"
+description = "Powerful data structures for data analysis, time series, and statistics"
+category = "main"
+optional = true
+python-versions = ">=3.6.1"
 
 [package.dependencies]
-numpy = ">=1.13.3"
-python-dateutil = ">=2.6.1"
+numpy = ">=1.15.4"
+python-dateutil = ">=2.7.3"
 pytz = ">=2017.2"
 
 [package.extras]
 test = ["pytest (>=4.0.2)", "pytest-xdist", "hypothesis (>=3.58)"]
 
 [[package]]
-category = "main"
-description = "Python Imaging Library (Fork)"
-name = "pillow"
+name = "pathspec"
+version = "0.8.1"
+description = "Utility library for gitignore style pattern matching of file paths."
+category = "dev"
 optional = false
-python-versions = ">=3.5"
-version = "7.2.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
+name = "pillow"
+version = "8.1.0"
+description = "Python Imaging Library (Fork)"
 category = "main"
-description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "main"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.10.0"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.9.0"
 
 [[package]]
-category = "main"
-description = "Get CPU info with pure Python 2 & 3"
 name = "py-cpuinfo"
-optional = false
-python-versions = "*"
 version = "7.0.0"
+description = "Get CPU info with pure Python 2 & 3"
+category = "main"
+optional = true
+python-versions = "*"
 
 [[package]]
-category = "main"
-description = "Python style guide checker"
 name = "pycodestyle"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.6.0"
+description = "Python style guide checker"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "passive checker of Python programs"
 name = "pyflakes"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "2.2.0"
+description = "passive checker of Python programs"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
+version = "2.7.4"
+description = "Pygments is a syntax highlighting package written in Python."
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "2.6.1"
 
 [[package]]
-category = "dev"
-description = "python code static checker"
 name = "pylint"
+version = "2.6.0"
+description = "python code static checker"
+category = "dev"
 optional = false
 python-versions = ">=3.5.*"
-version = "2.6.0"
 
 [package.dependencies]
 astroid = ">=2.4.0,<=2.5"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
 isort = ">=4.2.5,<6"
 mccabe = ">=0.6,<0.7"
 toml = ">=0.7.1"
 
 [[package]]
-category = "main"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.7"
 
 [[package]]
-category = "main"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "6.2.2"
+description = "pytest: simple powerful testing with Python"
+category = "main"
 optional = false
-python-versions = ">=3.5"
-version = "6.0.1"
+python-versions = ">=3.6"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
-attrs = ">=17.4.0"
-colorama = "*"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
-more-itertools = ">=4.0.0"
 packaging = "*"
-pluggy = ">=0.12,<1.0"
+pluggy = ">=0.12,<1.0.0a1"
 py = ">=1.8.2"
 toml = "*"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
-
 [package.extras]
-checkqa_mypy = ["mypy (0.780)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "main"
-description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer. See calibration_ and FAQ_."
 name = "pytest-benchmark"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "3.2.3"
+description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer. See calibration_ and FAQ_."
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
 py-cpuinfo = "*"
@@ -451,31 +438,39 @@ elasticsearch = ["elasticsearch"]
 histogram = ["pygal", "pygaljs"]
 
 [[package]]
-category = "main"
-description = "Extensions to the standard Python datetime module"
 name = "python-dateutil"
+version = "2.8.1"
+description = "Extensions to the standard Python datetime module"
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
-version = "2.8.1"
 
 [package.dependencies]
 six = ">=1.5"
 
 [[package]]
-category = "main"
-description = "World timezone definitions, modern and historical"
 name = "pytz"
+version = "2021.1"
+description = "World timezone definitions, modern and historical"
+category = "main"
+optional = true
+python-versions = "*"
+
+[[package]]
+name = "regex"
+version = "2020.11.13"
+description = "Alternative regular expression module, to replace re."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "2020.4"
 
 [[package]]
-category = "main"
-description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 name = "rich"
+version = "9.10.0"
+description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
+category = "main"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "6.1.1"
 
 [package.dependencies]
 colorama = ">=0.4.0,<0.5.0"
@@ -483,51 +478,48 @@ commonmark = ">=0.9.0,<0.10.0"
 pygments = ">=2.6.0,<3.0.0"
 typing-extensions = ">=3.7.4,<4.0.0"
 
-[package.dependencies.dataclasses]
-python = ">=3.6,<3.7"
-version = ">=0.7,<0.8"
-
 [package.extras]
 jupyter = ["ipywidgets (>=7.5.1,<8.0.0)"]
 
 [[package]]
-category = "main"
-description = "SciPy: Scientific Library for Python"
 name = "scipy"
+version = "1.6.0"
+description = "SciPy: Scientific Library for Python"
+category = "main"
 optional = false
-python-versions = ">=3.6"
-version = "1.5.2"
+python-versions = ">=3.7"
 
 [package.dependencies]
-numpy = ">=1.14.5"
+numpy = ">=1.16.5"
 
 [[package]]
-category = "main"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.15.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.15.0"
 
 [[package]]
-category = "main"
-description = "Python Library for Tom's Obvious, Minimal Language"
 name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "main"
 optional = false
-python-versions = "*"
-version = "0.10.1"
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
-category = "dev"
-description = "tox is a generic virtualenv management and test command line tool"
 name = "tox"
+version = "3.21.4"
+description = "tox is a generic virtualenv management and test command line tool"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "3.20.0"
 
 [package.dependencies]
-colorama = ">=0.4.1"
+colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
 filelock = ">=3.0.0"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 packaging = ">=14"
 pluggy = ">=0.12.0"
 py = ">=1.4.17"
@@ -535,89 +527,81 @@ six = ">=1.14.0"
 toml = ">=0.9.4"
 virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
 [package.extras]
 docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
-testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pathlib2 (>=2.3.3)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "pytest-xdist (>=1.22.2)"]
+testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "psutil (>=5.6.1)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "pytest-xdist (>=1.22.2)", "pathlib2 (>=2.3.3)"]
 
 [[package]]
-category = "dev"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-marker = "implementation_name == \"cpython\" and python_version < \"3.8\""
 name = "typed-ast"
+version = "1.4.2"
+description = "a fork of Python 2 and 3 ast modules with type comment support"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.4.1"
 
 [[package]]
-category = "main"
-description = "Backported and Experimental Type Hints for Python 3.5+"
 name = "typing-extensions"
+version = "3.7.4.3"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "main"
 optional = false
 python-versions = "*"
-version = "3.7.4.3"
 
 [[package]]
-category = "dev"
-description = "Virtual Python Environment builder"
 name = "virtualenv"
+version = "20.4.2"
+description = "Virtual Python Environment builder"
+category = "dev"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
-version = "20.0.31"
 
 [package.dependencies]
 appdirs = ">=1.4.3,<2"
 distlib = ">=0.3.1,<1"
 filelock = ">=3.0.0,<4"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 six = ">=1.9.0,<2"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12,<2"
-
-[package.dependencies.importlib-resources]
-python = "<3.7"
-version = ">=1.0"
-
 [package.extras]
 docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=19.9.0rc1)"]
-testing = ["coverage (>=5)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "pytest-xdist (>=1.31.0)", "packaging (>=20.0)", "xonsh (>=0.9.16)"]
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 [[package]]
-category = "dev"
-description = "Module for decorators, wrappers and monkey patching."
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+version = "1.12.1"
+description = "Module for decorators, wrappers and monkey patching."
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.12.1"
 
 [[package]]
-category = "main"
-description = "Makes working with XML feel like you are working with JSON"
 name = "xmltodict"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
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+description = "Makes working with XML feel like you are working with JSON"
+category = "main"
+optional = true
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
-category = "main"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
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+version = "3.4.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
 optional = false
 python-versions = ">=3.6"
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+testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pytest-cov", "jaraco.test (>=3.2.0)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
+[extras]
+metrics = ["motmetrics"]
+video = ["opencv-python"]
 
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+    {file = "typed_ast-1.4.2-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:8db0e856712f79c45956da0c9a40ca4246abc3485ae0d7ecc86a20f5e4c09abc"},
+    {file = "typed_ast-1.4.2-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:d003156bb6a59cda9050e983441b7fa2487f7800d76bdc065566b7d728b4581a"},
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+    {file = "typed_ast-1.4.2-cp36-cp36m-win_amd64.whl", hash = "sha256:d175297e9533d8d37437abc14e8a83cbc68af93cc9c1c59c2c292ec59a0697a3"},
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+    {file = "typed_ast-1.4.2-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:987f15737aba2ab5f3928c617ccf1ce412e2e321c77ab16ca5a293e7bbffd581"},
+    {file = "typed_ast-1.4.2-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:37f48d46d733d57cc70fd5f30572d11ab8ed92da6e6b28e024e4a3edfb456e37"},
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+    {file = "typed_ast-1.4.2-cp37-cp37m-win_amd64.whl", hash = "sha256:8368f83e93c7156ccd40e49a783a6a6850ca25b556c0fa0240ed0f659d2fe496"},
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+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux1_i686.whl", hash = "sha256:e683e409e5c45d5c9082dc1daf13f6374300806240719f95dc783d1fc942af10"},
+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:84aa6223d71012c68d577c83f4e7db50d11d6b1399a9c779046d75e24bed74ea"},
+    {file = "typed_ast-1.4.2-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:a38878a223bdd37c9709d07cd357bb79f4c760b29210e14ad0fb395294583787"},
+    {file = "typed_ast-1.4.2-cp38-cp38-win32.whl", hash = "sha256:a2c927c49f2029291fbabd673d51a2180038f8cd5a5b2f290f78c4516be48be2"},
+    {file = "typed_ast-1.4.2-cp38-cp38-win_amd64.whl", hash = "sha256:c0c74e5579af4b977c8b932f40a5464764b2f86681327410aa028a22d2f54937"},
+    {file = "typed_ast-1.4.2-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:07d49388d5bf7e863f7fa2f124b1b1d89d8aa0e2f7812faff0a5658c01c59aa1"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_i686.whl", hash = "sha256:240296b27397e4e37874abb1df2a608a92df85cf3e2a04d0d4d61055c8305ba6"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:d746a437cdbca200622385305aedd9aef68e8a645e385cc483bdc5e488f07166"},
+    {file = "typed_ast-1.4.2-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:14bf1522cdee369e8f5581238edac09150c765ec1cb33615855889cf33dcb92d"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win32.whl", hash = "sha256:cc7b98bf58167b7f2db91a4327da24fb93368838eb84a44c472283778fc2446b"},
+    {file = "typed_ast-1.4.2-cp39-cp39-win_amd64.whl", hash = "sha256:7147e2a76c75f0f64c4319886e7639e490fee87c9d25cb1d4faef1d8cf83a440"},
+    {file = "typed_ast-1.4.2.tar.gz", hash = "sha256:9fc0b3cb5d1720e7141d103cf4819aea239f7d136acf9ee4a69b047b7986175a"},
 ]
 typing-extensions = [
     {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
@@ -1001,8 +1052,8 @@ typing-extensions = [
     {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
 ]
 virtualenv = [
-    {file = "virtualenv-20.0.31-py2.py3-none-any.whl", hash = "sha256:e0305af10299a7fb0d69393d8f04cb2965dda9351140d11ac8db4e5e3970451b"},
-    {file = "virtualenv-20.0.31.tar.gz", hash = "sha256:43add625c53c596d38f971a465553f6318decc39d98512bc100fa1b1e839c8dc"},
+    {file = "virtualenv-20.4.2-py2.py3-none-any.whl", hash = "sha256:2be72df684b74df0ea47679a7df93fd0e04e72520022c57b479d8f881485dbe3"},
+    {file = "virtualenv-20.4.2.tar.gz", hash = "sha256:147b43894e51dd6bba882cf9c282447f780e2251cd35172403745fc381a0a80d"},
 ]
 wrapt = [
     {file = "wrapt-1.12.1.tar.gz", hash = "sha256:b62ffa81fb85f4332a4f609cab4ac40709470da05643a082ec1eb88e6d9b97d7"},
@@ -1012,6 +1063,6 @@ xmltodict = [
     {file = "xmltodict-0.12.0.tar.gz", hash = "sha256:50d8c638ed7ecb88d90561beedbf720c9b4e851a9fa6c47ebd64e99d166d8a21"},
 ]
 zipp = [
-    {file = "zipp-3.1.0-py3-none-any.whl", hash = "sha256:aa36550ff0c0b7ef7fa639055d797116ee891440eac1a56f378e2d3179e0320b"},
-    {file = "zipp-3.1.0.tar.gz", hash = "sha256:c599e4d75c98f6798c509911d08a22e6c021d074469042177c8c86fb92eefd96"},
+    {file = "zipp-3.4.0-py3-none-any.whl", hash = "sha256:102c24ef8f171fd729d46599845e95c7ab894a4cf45f5de11a44cc7444fb1108"},
+    {file = "zipp-3.4.0.tar.gz", hash = "sha256:ed5eee1974372595f9e416cc7bbeeb12335201d8081ca8a0743c954d4446e5cb"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 68e0247d..176c35c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ readme = "README.md"
 [tool.poetry.dependencies]
 python = "^3.7"
 filterpy = "^1.4.5"
-rich = "^6.1.1"
+rich = "^9.10.0"
 opencv-python = {version = ">= 3.2.0, < 5.0.0", optional = true}
 motmetrics = {version = "1.2.0", optional = true}
 
@@ -19,13 +19,11 @@ metrics = ["motmetrics"]
 video = ["opencv-python"]
 
 [tool.poetry.dev-dependencies]
-pytest = "^6.0.1"
-# Had to disable black because of this: https://github.com/python-poetry/poetry/issues/2386
-# Please install separately for development.
-# black = "^20.8b1"
-isort = "^5.5.1"
+black = "^20.8b1"
+isort = "^5.7.0"
 pylint = "^2.6.0"
-tox = "^3.20.0"
+pytest = "^6.2.2"
+tox = "^3.21.4"
 
 [build-system]
 requires = ["poetry>=0.12"]

From 37ac3f955069fe37f408daf77051a43bae36b74b Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:13:32 -0300
Subject: [PATCH 06/14] Correct import, make sure motmetrics4norfair does not
 depend on OpenCV.

---
 demos/motmetrics4norfair/motmetrics4norfair.py | 1 -
 norfair/drawing.py                             | 2 +-
 norfair/metrics.py                             | 2 +-
 norfair/video.py                               | 2 +-
 4 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/demos/motmetrics4norfair/motmetrics4norfair.py b/demos/motmetrics4norfair/motmetrics4norfair.py
index 1c0bcd0b..42088bce 100644
--- a/demos/motmetrics4norfair/motmetrics4norfair.py
+++ b/demos/motmetrics4norfair/motmetrics4norfair.py
@@ -1,6 +1,5 @@
 import os.path
 import numpy as np
-import norfair
 from norfair import Detection, Tracker, metrics, video, drawing
 import argparse
 
diff --git a/norfair/drawing.py b/norfair/drawing.py
index 4e9e8123..ab5d009b 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -2,7 +2,7 @@
 try:
     import cv2
 except:
-    from utils import DummyOpenCVImport
+    from .utils import DummyOpenCVImport
     cv2 = DummyOpenCVImport()
 import numpy as np
 import random
diff --git a/norfair/metrics.py b/norfair/metrics.py
index 39140c6b..1c5d06d8 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -6,7 +6,7 @@
 try:
     import motmetrics as mm
 except:
-    from utils import DummyMOTMetricsImport
+    from .utils import DummyMOTMetricsImport
     mm = DummyMOTMetricsImport()
 from collections import OrderedDict
 import pandas as pd
diff --git a/norfair/video.py b/norfair/video.py
index a34ba571..ba720224 100644
--- a/norfair/video.py
+++ b/norfair/video.py
@@ -4,7 +4,7 @@
 try:
     import cv2
 except ImportError:
-    from utils import DummyOpenCVImport
+    from .utils import DummyOpenCVImport
     cv2 = DummyOpenCVImport()
 import numpy as np
 from rich import print

From 6fe5bbd6db54725a32816e30834ae7f7f54aea65 Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:18:20 -0300
Subject: [PATCH 07/14] Add .isort.cfg, pass all files through Black formatter.

---
 .isort.cfg                                     | 3 +++
 demos/motmetrics4norfair/motmetrics4norfair.py | 6 ++++--
 demos/yolov4/yolov4demo.py                     | 6 +++---
 norfair/__init__.py                            | 2 +-
 norfair/drawing.py                             | 7 +++++--
 norfair/metrics.py                             | 5 +++++
 norfair/tracker.py                             | 4 ++--
 norfair/utils.py                               | 2 +-
 norfair/video.py                               | 6 ++++--
 9 files changed, 28 insertions(+), 13 deletions(-)
 create mode 100644 .isort.cfg

diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 00000000..aa7e7666
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,3 @@
+[tool.isort]
+profile = "black"
+multi_line_output = 3
diff --git a/demos/motmetrics4norfair/motmetrics4norfair.py b/demos/motmetrics4norfair/motmetrics4norfair.py
index 42088bce..ecf64a30 100644
--- a/demos/motmetrics4norfair/motmetrics4norfair.py
+++ b/demos/motmetrics4norfair/motmetrics4norfair.py
@@ -1,7 +1,9 @@
+import argparse
 import os.path
+
 import numpy as np
-from norfair import Detection, Tracker, metrics, video, drawing
-import argparse
+
+from norfair import Detection, Tracker, drawing, metrics, video
 
 frame_skip_period = 1
 detection_threshold = 0.01
diff --git a/demos/yolov4/yolov4demo.py b/demos/yolov4/yolov4demo.py
index fc99de85..39f40a5d 100644
--- a/demos/yolov4/yolov4demo.py
+++ b/demos/yolov4/yolov4demo.py
@@ -3,13 +3,13 @@
 import cv2
 import numpy as np
 import torch
-
-import norfair
 from models import Yolov4
-from norfair import Detection, Tracker, Video
 from tool.torch_utils import do_detect
 from tool.utils import load_class_names, plot_boxes_cv2
 
+import norfair
+from norfair import Detection, Tracker, Video
+
 max_distance_between_points = 30
 
 
diff --git a/norfair/__init__.py b/norfair/__init__.py
index 768a02ff..5f7c4a4b 100644
--- a/norfair/__init__.py
+++ b/norfair/__init__.py
@@ -1,4 +1,4 @@
 from .drawing import *
 from .tracker import Detection, Tracker
-from .utils import print_objects_as_table, get_cutout
+from .utils import get_cutout, print_objects_as_table
 from .video import Video
diff --git a/norfair/drawing.py b/norfair/drawing.py
index ab5d009b..a917ddc7 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -1,12 +1,15 @@
-from typing import Optional, Tuple, Sequence
+from typing import Optional, Sequence, Tuple
+
 try:
     import cv2
 except:
     from .utils import DummyOpenCVImport
+
     cv2 = DummyOpenCVImport()
-import numpy as np
 import random
 
+import numpy as np
+
 from .tracker import Detection, TrackedObject
 from .utils import validate_points
 
diff --git a/norfair/metrics.py b/norfair/metrics.py
index 1c5d06d8..2cf47145 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -1,14 +1,19 @@
 import os
+
 import numpy as np
 from rich import print
 from rich.progress import track
+
 from norfair import Detection
+
 try:
     import motmetrics as mm
 except:
     from .utils import DummyMOTMetricsImport
+
     mm = DummyMOTMetricsImport()
 from collections import OrderedDict
+
 import pandas as pd
 
 
diff --git a/norfair/tracker.py b/norfair/tracker.py
index 90490ac4..4dd9206e 100644
--- a/norfair/tracker.py
+++ b/norfair/tracker.py
@@ -1,10 +1,10 @@
 import math
-from typing import Callable, Optional, Sequence, List
+from typing import Callable, List, Optional, Sequence
 
 import numpy as np
 from filterpy.kalman import KalmanFilter
-
 from rich import print
+
 from .utils import validate_points
 
 
diff --git a/norfair/utils.py b/norfair/utils.py
index 58ca0e57..71758eeb 100644
--- a/norfair/utils.py
+++ b/norfair/utils.py
@@ -1,5 +1,5 @@
 import os
-from typing import Tuple, Sequence
+from typing import Sequence, Tuple
 
 import numpy as np
 from rich import print
diff --git a/norfair/video.py b/norfair/video.py
index ba720224..5d8e7930 100644
--- a/norfair/video.py
+++ b/norfair/video.py
@@ -1,14 +1,16 @@
 import os
 import time
-from typing import Optional, List, Union
+from typing import List, Optional, Union
+
 try:
     import cv2
 except ImportError:
     from .utils import DummyOpenCVImport
+
     cv2 = DummyOpenCVImport()
 import numpy as np
 from rich import print
-from rich.progress import BarColumn, Progress, TimeRemainingColumn, ProgressColumn
+from rich.progress import BarColumn, Progress, ProgressColumn, TimeRemainingColumn
 
 from .utils import get_terminal_size
 

From eff6e8ce3399afebafb25765564c89870f0f95f8 Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:27:37 -0300
Subject: [PATCH 08/14] Fix bug when creating folder.

---
 norfair/metrics.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/norfair/metrics.py b/norfair/metrics.py
index 2cf47145..3e2f10f6 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -229,9 +229,9 @@ def compute_metrics(
         return self.summary
 
     def save_metrics(self, save_path=".", file_name="metrics.txt"):
-
         if not os.path.exists(save_path):
-            os.makedirs(save_folder)
+            os.makedirs(save_path)
+
         metrics_path = os.path.join(save_path, file_name)
         metrics_file = open(metrics_path, "w+")
         metrics_file.write(self.summary)

From 6c0c7fdca32b5e9b17a5052ecab540c46c59a969 Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 15:27:27 -0300
Subject: [PATCH 09/14] Fix unused imports.

---
 demos/motmetrics4norfair/motmetrics4norfair.py | 2 +-
 demos/yolov4/README.md                         | 1 -
 norfair/drawing.py                             | 1 -
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/demos/motmetrics4norfair/motmetrics4norfair.py b/demos/motmetrics4norfair/motmetrics4norfair.py
index ecf64a30..40dabaac 100644
--- a/demos/motmetrics4norfair/motmetrics4norfair.py
+++ b/demos/motmetrics4norfair/motmetrics4norfair.py
@@ -3,7 +3,7 @@
 
 import numpy as np
 
-from norfair import Detection, Tracker, drawing, metrics, video
+from norfair import Tracker, drawing, metrics, video
 
 frame_skip_period = 1
 detection_threshold = 0.01
diff --git a/demos/yolov4/README.md b/demos/yolov4/README.md
index 872a40e6..5c1969f4 100644
--- a/demos/yolov4/README.md
+++ b/demos/yolov4/README.md
@@ -13,4 +13,3 @@ Simplest possible example of tracking. Based on [pytorch YOLOv4](https://github.
 This example tracks objects using a single point per detection: the centroid of the bounding boxes around cars returned by YOLOv4.
 
 ![Norfair YOLOv4 demo](../../docs/yolo_cars.gif)
-
diff --git a/norfair/drawing.py b/norfair/drawing.py
index a917ddc7..632f50d3 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -10,7 +10,6 @@
 
 import numpy as np
 
-from .tracker import Detection, TrackedObject
 from .utils import validate_points
 
 

From 62c2244309d2dece150044ed512051ef328fbb19 Mon Sep 17 00:00:00 2001
From: Alan Descoins <dekked@gmail.com>
Date: Fri, 12 Feb 2021 17:41:22 -0300
Subject: [PATCH 10/14] Avoid bare exception catching.

---
 norfair/drawing.py | 2 +-
 norfair/metrics.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/norfair/drawing.py b/norfair/drawing.py
index 632f50d3..3e71d13f 100644
--- a/norfair/drawing.py
+++ b/norfair/drawing.py
@@ -2,7 +2,7 @@
 
 try:
     import cv2
-except:
+except ImportError:
     from .utils import DummyOpenCVImport
 
     cv2 = DummyOpenCVImport()
diff --git a/norfair/metrics.py b/norfair/metrics.py
index 3e2f10f6..3cd5f3e5 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -8,7 +8,7 @@
 
 try:
     import motmetrics as mm
-except:
+except ImportError:
     from .utils import DummyMOTMetricsImport
 
     mm = DummyMOTMetricsImport()

From 4b9f80ead8a652ad9664554694d6d1352ca1c2e8 Mon Sep 17 00:00:00 2001
From: joaqo <joaquin.alori@gmail.com>
Date: Sat, 13 Feb 2021 14:52:48 -0300
Subject: [PATCH 11/14] Better dependency checking for metrics

Also improve missing dependency error message.
---
 norfair/metrics.py | 6 +++++-
 norfair/utils.py   | 6 ++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/norfair/metrics.py b/norfair/metrics.py
index 3cd5f3e5..0b0f7dd8 100644
--- a/norfair/metrics.py
+++ b/norfair/metrics.py
@@ -8,13 +8,14 @@
 
 try:
     import motmetrics as mm
+    import pandas as pd
 except ImportError:
     from .utils import DummyMOTMetricsImport
 
     mm = DummyMOTMetricsImport()
+    pandas = DummyMOTMetricsImport()
 from collections import OrderedDict
 
-import pandas as pd
 
 
 class InformationFile:
@@ -166,6 +167,9 @@ def __init__(self):
         self.paths = []
 
     def create_accumulator(self, input_path, information_file=None):
+        # Check that motmetrics is installed here, so we don't have to process
+        # the whole dataset before failing out if we don't.
+        mm.metrics
 
         file_name = os.path.split(input_path)[1]
 
diff --git a/norfair/utils.py b/norfair/utils.py
index 71758eeb..cae724d9 100644
--- a/norfair/utils.py
+++ b/norfair/utils.py
@@ -73,7 +73,7 @@ def get_cutout(points, image):
 class DummyOpenCVImport:
     def __getattribute__(self, name):
         print(
-            """[bold red]Missing dependency:[/bold red] you are trying to use Norfair's video features. However, OpenCV is not installed.
+            """[bold red]Missing dependency:[/bold red] You are trying to use Norfair's video features. However, OpenCV is not installed.
 
 Please, make sure there is an existing installation of OpenCV or install Norfair with `pip install norfair\[video]`."""
         )
@@ -83,6 +83,8 @@ def __getattribute__(self, name):
 class DummyMOTMetricsImport:
     def __getattribute__(self, name):
         print(
-            """[bold red]Missing dependency:[/bold red] you are trying to use Norfair's metrics features. Please, install Norfair with `pip install norfair\[metrics]`."""
+            """[bold red]Missing dependency:[/bold red] You are trying to use Norfair's metrics features without the required dependencies.
+
+Please, install Norfair with `pip install norfair\[metrics]`, or `pip install norfair\[metrics,video]` if you also want video features."""
         )
         exit()

From 27bc499bc9fd89af44b57c0acb1cb359402b0635 Mon Sep 17 00:00:00 2001
From: joaqo <joaquin.alori@gmail.com>
Date: Sat, 13 Feb 2021 15:19:34 -0300
Subject: [PATCH 12/14] Improve dependency section in README

---
 README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 0c8ed01d..89ee7a19 100644
--- a/README.md
+++ b/README.md
@@ -22,14 +22,12 @@ Norfair is built, used and maintained by [Tryolabs](https://tryolabs.com).
 
 Norfair currently supports Python 3.7+.
 
-For the pure version with minimal Python dependencies, install as:
+For the pure python version, install as:
 
 ```bash
 pip install norfair
 ```
 
-Note that this will NOT install OpenCV, which is needed for video aplications. Therefore, you need to make sure Norfair runs in an environment with an existing OpenCV installation.
-
 To make Norfair install the dependencies to support more features, install as:
 
 ```bash
@@ -38,6 +36,8 @@ pip install norfair[metrics]  # Supports running MOT metrics evaluation
 pip install norfair[metrics,video]  # Everything included
 ```
 
+If the needed dependencies are already present in the system, installing the pure python version of Norfair is enough for enabling the extra features. This is particuarly useful for embedded devices, where installing compiled dependencies can be difficult.
+
 ## How it works
 
 Norfair works by estimating the future position of each point based on its past positions. It then tries to match these estimated positions with newly detected points provided by the detector. For this matching to occur, Norfair can rely on any distance function specified by the user of the library. Therefore, each object tracker can be made as simple or as complex as needed.

From e7258a819bc2722a753fb5a6c9c320839cb5cfff Mon Sep 17 00:00:00 2001
From: joaqo <joaquin.alori@gmail.com>
Date: Sat, 13 Feb 2021 16:18:26 -0300
Subject: [PATCH 13/14] Capitalize Python in README

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 89ee7a19..a001b406 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Norfair is built, used and maintained by [Tryolabs](https://tryolabs.com).
 
 Norfair currently supports Python 3.7+.
 
-For the pure python version, install as:
+For the pure Python version, install as:
 
 ```bash
 pip install norfair
@@ -36,7 +36,7 @@ pip install norfair[metrics]  # Supports running MOT metrics evaluation
 pip install norfair[metrics,video]  # Everything included
 ```
 
-If the needed dependencies are already present in the system, installing the pure python version of Norfair is enough for enabling the extra features. This is particuarly useful for embedded devices, where installing compiled dependencies can be difficult.
+If the needed dependencies are already present in the system, installing the pure Python version of Norfair is enough for enabling the extra features. This is particuarly useful for embedded devices, where installing compiled dependencies can be difficult.
 
 ## How it works
 

From 5b8ee6c346efe4ec369f87bf94f71f61532082f6 Mon Sep 17 00:00:00 2001
From: joaqo <joaquin.alori@gmail.com>
Date: Wed, 17 Feb 2021 11:45:47 -0300
Subject: [PATCH 14/14] Fix small typo

---
 demos/detectron2/README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/demos/detectron2/README.md b/demos/detectron2/README.md
index 20a8786d..46a97e43 100644
--- a/demos/detectron2/README.md
+++ b/demos/detectron2/README.md
@@ -6,7 +6,7 @@ Simplest possible example of tracking. Based on [Detectron2](https://github.com/
 
 Assuming Norfair is installed:
 
-1. Install norfair with `pip install norfair[video]`.
+1. Install Norfair with `pip install norfair[video]`.
 2. [Follow the instructions](https://detectron2.readthedocs.io/tutorials/install.html) to install Detectron2.
 3. Run `python detectron2_cars.py`. For the demo, we are using [this traffic footage](https://www.youtube.com/watch?v=aio9g9_xVio).