asclass DynWebCamAnalyzer > DynImageSurfaceAndEnabled {
  switchable bool overlay;
  transient ReliableSingleThread rstUpdateImage = dm_rst(this, r updateImage);
  transient long duration = -1; // ms per recognition
  transient JLabel lblInfo;
  transient BufferedImage inputImage;

  start-thread {
    doEvery(100, rstUpdateImage);
  }

  afterVisualize {
    imageSurface_pixelated(imageSurface);
    containerAddFirst(buttons,
      lblInfo = jlabel(),
      dm_checkBox('overlay));
  }
  
  void updateImage enter {
    if (imageSurface == null || !enabled) ret;
    BufferedImage img = dm_webCamImage();
    temp tempAfterwards(r { inputImage = img });
    if (img == null || img == inputImage) ret;
    
    analyzeImage();
    if (overlay)
      drawOverlays(img = cloneBufferedImage(img));
    setImage(img);
  }
  
  // overlord me, uh, i mean, overload me
  void analyzeImage() {
  }
  
  // overlooooad me if you want
  void drawOverlays(BufferedImage img) {
  }
}