docs: public static Webcam openDevice( String deviceName , int desiredWidth , int desiredHeight ) {
  		Webcam webcam = findDevice(deviceName);
  		if( webcam == null )
  			throw new IllegalArgumentException("Can't find camera "+deviceName);
  		adjustResolution(webcam,desiredWidth,desiredHeight);
  		webcam.open();
  		return webcam;
  	}