005_posenet-worker-js

This is webworker module for Posenet.

PoseNet

Install

$ npm install \@dannadori/posenet-worker-js

API

generatePoseNetDefaultConfig: () => PoseNetConfig;
generateDefaultPoseNetParams: () => PoseNetOperationParams;
drawSkeltonAndPoint: (srcCanvas: HTMLCanvasElement, prediction: poseNet.Pose[]) => ImageData;

PoseNetWorkerManager
init(config?: PoseNetConfig | null): Promise<unknown>;
predict(targetCanvas: HTMLCanvasElement, params?: PoseNetOperationParams): Promise<poseNet.Pose[]>;

Configuration and Parameter

export interface PoseNetConfig{
    browserType         : BrowserType
    model               : ModelConfig
    processOnLocal      : boolean
    // processWidth        : number
    // processHeight       : number
}

export enum PoseNetFunctionType{
    SinglePerson,
    MultiPerson,// Not implemented
}

export interface PoseNetOperationParams{
    type               : PoseNetFunctionType
    singlePersonParams : SinglePersonInterfaceConfig
    multiPersonParams  : MultiPersonInferenceConfig
}

Step by step

Create environment and install package

$ npx create-react-app demo  --template typescript
$ cd demo/
$ npm install
$ npm install @dannadori/posenet-worker-js

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 { PoseNetWorkerManager, generateDefaultPoseNetParams, generatePoseNetDefaultConfig, drawSkeltonAndPoint } from '@dannadori/posenet-worker-js'

class App extends React.Component{

  manager = new PoseNetWorkerManager()
  config = generatePoseNetDefaultConfig()
  params = generateDefaultPoseNetParams()

  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)=>{
        const imageData = drawSkeltonAndPoint(this.srcCanvas, res)
        console.log(res)
        this.dstCanvas.getContext("2d")!.putImageData(imageData, 0, 0)
      })
    }
    srcImage.src = "./srcImage.jpg"
  }

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

export default App;

build and start

$ npm run start