U^2-Net Portrait Drawing

Install

## install
$ npm install @dannadori/u2net-portrait-worker-js
$ cp node_modules/\@tensorflow/tfjs-backend-wasm/dist/tfjs-backend-wasm.wasm public/

API

generateU2NetPortraitDefaultConfig: () => U2NetPortraitConfig;
generateDefaultU2NetPortraitParams: () => U2NetPortraitOperationParams;
createForegroundImage: (srcCanvas: HTMLCanvasElement, prediction: number[][]) => ImageData;

export declare class U2NetPortraitWorkerManager {
    init(config: U2NetPortraitConfig | null): Promise<void>;
    predict(targetCanvas: HTMLCanvasElement, params?: U2NetPortraitOperationParams): Promise<number[][]>;
}

Configuration and Parameter

export interface U2NetPortraitConfig {
    browserType: BrowserType;
    processOnLocal: boolean;
    useTFWasmBackend: boolean;
    wasmPath: string;
    modelPath: string;
    workerPath: string;
}
export interface U2NetPortraitOperationParams {
    type: U2NetPortraitFunctionType;
    processWidth: number;
    processHeight: number;
}
export declare enum U2NetPortraitFunctionType {
    Portrait = 0,
    xxx = 1
}

Step by step

Create environment and install package

$ npx create-react-app demo --template typescript
$ cd demo/
$ npm install
$ npm install @dannadori/u2net-portrait-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 { generateDefaultU2NetPortraitParams, generateU2NetPortraitDefaultConfig, U2NetPortraitWorkerManager, createForegroundImage } from '@dannadori/u2net-portrait-worker-js'

class App extends React.Component{

  manager = new U2NetPortraitWorkerManager()

  config = (()=>{
    const c = generateU2NetPortraitDefaultConfig()
    c.useTFWasmBackend = false
    c.wasmPath = ""
    c.modelPath="/u2net-portrait_192/model.json"
    return c
  })()
  params = (()=>{
    const p = generateDefaultU2NetPortraitParams()
    p.processHeight=192
    p.processWidth=192
    return p
  })()


  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 foreground = createForegroundImage(this.srcCanvas, res)
        this.dstCanvas.getContext("2d")!.putImageData(foreground, 0, 0)
      })
    }
    srcImage.src = "./srcImage.jpg"
  }

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

export default App;

build and start

$ npm run start