002_facemesh-worker-js

This is webworker module for Face landmarks detection.

facemesh

Install

$ npm install \@dannadori/facemesh-worker-js
$ cp node_modules/\@tensorflow/tfjs-backend-wasm/dist/tfjs-backend-wasm.wasm public/

API

generateFacemeshDefaultConfig: () => FacemeshConfig;
generateDefaultFacemeshParams: () => FacemeshOperationParams;
drawFacemeshImage: (srcCanvas: HTMLCanvasElement, prediction: facemesh.AnnotatedPrediction[], params: FacemeshOperationParams) => ImageData;

FacemeshWorkerManager
init: (config: FacemeshConfig | null) => Promise<unknown>;
predict: (targetCanvas: HTMLCanvasElement, params: FacemeshOperationParams) => Promise<any>;

Configuration and Parameter

export interface ModelConfig{
    maxContinuousChecks: number;
    detectionConfidence: number;
    maxFaces: number;
    iouThreshold: number;
    scoreThreshold: number;
}

export interface FacemeshConfig {
    browserType         : BrowserType
    useTFWasmBackend    : boolean
    wasmPath            : string
    modelReloadInterval : number
    model               : ModelConfig
    processOnLocal      : boolean
}

export interface FacemeshOperationParams {
    type: FacemeshFunctionType;
    processWidth: number;
    processHeight: number;
    predictIrises: boolean;
}

export enum FacemeshFunctionType{
    DetectMesh,
}

Step by step

Create environment and install package

$ npx create-react-app demo  --template typescript
$ cd demo/
$ npm install
$ npm install @dannadori/facemesh-worker-js
$ cp node_modules/\@tensorflow/tfjs-backend-wasm/dist/tfjs-backend-wasm.wasm public/

Add source image to public.

In this time, the name is "srcImage.jpg"

Edit src/App.tsx

Sample code is here.

import React from 'react';
import './App.css';
import { FacemeshWorkerManager, generateDefaultFacemeshParams, generateFacemeshDefaultConfig, drawFacemeshImage } from '@dannadori/facemesh-worker-js'

class App extends React.Component{

  manager = new FacemeshWorkerManager()
  config = generateFacemeshDefaultConfig()
  params = generateDefaultFacemeshParams()

  srcCanvas = document.createElement("canvas")
  dstCanvas = document.createElement("canvas")

  componentDidMount = () =>{
    document.getRootNode().lastChild!.appendChild(this.srcCanvas)
    document.getRootNode().lastChild!.appendChild(this.dstCanvas)
    const srcImage = document.createElement("img")
    srcImage.onload = () =>{
      this.manager.init(this.config).then(()=>{
        this.srcCanvas.getContext("2d")!.drawImage(
          srcImage, 0, 0, this.srcCanvas.width, this.dstCanvas.height)
        return this.manager.predict(this.srcCanvas, this.params)
      }).then((res)=>{
        console.log(res)
        const facemeshImage = drawFacemeshImage(this.srcCanvas, res, this.params)
        this.dstCanvas.getContext("2d")!.putImageData(facemeshImage, 0, 0)
      })
    }
    srcImage.src = "./srcImage.jpg"
  }

  render = ()=>{
    return (
      <div className="App">
      </div>
    );
  }
}

export default App;

build and start

$ npm run start