docs: private boolean checkLargeMotion( int width , int height ) {
  		if( first ) {
  			getImageCorners(width,height,corners);
  			previousArea = computeArea(corners);
  			first = false;
  		} else {
  			getImageCorners(width,height,corners);
  
  			double area = computeArea(corners);
  
  			double change = Math.max(area/previousArea,previousArea/area)-1;
  			if( change > maxJumpFraction ) {
  				return true;
  			}
  			previousArea = area;
  		}
  
  		return false;
  
  	}