Method constructor

tfjs-data/src/iterators/webcam_iterator.ts:35–61

(
      protected readonly webcamVideoElement: HTMLVideoElement,
      protected readonly webcamConfig: WebcamConfig)

  private cropBoxInd: Tensor1D;

  private constructor(
      protected readonly webcamVideoElement: HTMLVideoElement,
      protected readonly webcamConfig: WebcamConfig) {
    super();
    if (this.needToResize()) {
      this.resize = true;
      this.cropSize =
          [this.webcamConfig.resizeHeight, this.webcamConfig.resizeWidth];
      this.cropBoxInd = tensor1d([0], 'int32');
      if (this.webcamConfig.centerCrop) {
        // Calculate the box based on resizing shape.
        const widthCroppingRatio =
            this.webcamConfig.resizeWidth * 1.0 / this.webcamVideoElement.width;
        const heightCroppingRatio = this.webcamConfig.resizeHeight * 1.0 /
            this.webcamVideoElement.height;
        const widthCropStart = (1 - widthCroppingRatio) / 2;
        const heightCropStart = (1 - heightCroppingRatio) / 2;
        const widthCropEnd = widthCropStart + widthCroppingRatio;
        const heightCropEnd = heightCroppingRatio + heightCropStart;
        this.cropBox = tensor2d(
            [heightCropStart, widthCropStart, heightCropEnd, widthCropEnd],
            [1, 4]);
      } else {
        this.cropBox = tensor2d([0, 0, 1, 1], [1, 4]);
      }
    }
  }

  summary() {
    return `webcam`;