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Mention more Theia dependencies #262

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367aa32
Mention more Theia dependencies
oleg-alexandrov Nov 22, 2021
56f68c5
Add example of calibration for the FOV camera
oleg-alexandrov Nov 24, 2021
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10 changes: 8 additions & 2 deletions docs/source/building.rst
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Expand Up @@ -25,11 +25,17 @@ Theia relies on a number of open source libraries. Luckily, most of the will be

5. `Ceres Solver <https://code.google.com/p/ceres-solver/>`_ is a library for solving non-linear least squares problems. In particular, Theia uses it for Bundle Adjustment.

6. `RocksDB <http://rocksdb.org/>`_ is a persistent key-value store for Flash and RAM storage.

7. `RapidJSON <https://rapidjson.org/>`__ is a fast JSON parser and generator.

Many of these libraries can be installed quickly with ``conda``. It is suggested to install a build of Ceres which uses ``libsuitesparse``.

**NOTE**: Theia also depends on the following libraries, but they are included in the installation of Ceres so it is likely that you do not need to reinstall them.

6. `google-glog <http://code.google.com/p/google-glog>`_ is used for error checking and logging. Ceres needs glog version 0.3.1 or later. Version 0.3 (which ships with Fedora 16) has a namespace bug which prevents Ceres from building.
8. `google-glog <http://code.google.com/p/google-glog>`_ is used for error checking and logging. Ceres needs glog version 0.3.1 or later. Version 0.3 (which ships with Fedora 16) has a namespace bug which prevents Ceres from building.

7. `gflags <http://code.google.com/p/gflags>`_ is a library for processing command line flags. It is used by some of the examples and tests.
9. `gflags <http://code.google.com/p/gflags>`_ is a library for processing command line flags. It is used by some of the examples and tests.

Make sure all of these libraries are installed properly before proceeding. Improperly installing any of these libraries can cause Theia to not build.

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14 changes: 12 additions & 2 deletions src/theia/io/read_calibration.h
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Expand Up @@ -41,8 +41,10 @@
namespace theia {
struct CameraIntrinsicsPrior;

// Reads calibration data for images that are to be reconstructed. The
// calibration file should have the following JSON format:
// Reads calibration data for images that are to be reconstructed in
// the JSON format. The calibration file has the image name, dimensions,
// camera model, and intrinsics. Examples are shown below for three types
// of camera models:
//
// {
// "priors" : [
Expand Down Expand Up @@ -70,6 +72,14 @@ struct CameraIntrinsicsPrior;
// "altitude" : 64,
// "camera_intrinsics_type" : "PINHOLE_RADIAL_TANGENTIAL"
// }}
// {"CameraIntrinsicsPrior" : {
// "image_name" : "view_3.jpg",
// "focal_length" : 600,
// "principal_point" : [640, 520],
// "aspect_ratio" : 1.0,
// "radial_distortion_1" : 0.998693
// "camera_intrinsics_type" : "FOV"
// }}
// ]
// }
//
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