Java - Reproductor de vídeo JAVA

computeFrame: function() {

    this.ctx1.drawImage(this.video, 0, 0, this.width, this.height);

    let frame = this.ctx1.getImageData(0, 0, this.width, this.height);

    let l = frame.data.length / 4;

    for (let i = 0; i < l; i++) {

      let r = frame.data[i * 4 + 0];

      let g = frame.data[i * 4 + 1];

      let b = frame.data[i * 4 + 2];

      if (g > 100 && r > 100 && b < 43)

        frame.data[i * 4 + 3] = 0;

    }

    this.ctx2.putImageData(frame, 0, 0);

    return;

  }