code: private static void drawRectangles(Graphics2D g2,
  									   GrayF32 image, GrayF32 template, GrayF32 mask,
  									   int expectedMatches) {
  		List<Match> found = findMatches(image, template, mask, expectedMatches);
  
  		int r = 2;
  		int w = template.width + 2 * r;
  		int h = template.height + 2 * r;
  
  		for (Match m : found) {
  			System.out.println("Match "+m.x+" "+m.y+"    score "+m.score);
  			// this demonstrates how to filter out false positives
  			// the meaning of score will depend on the template technique
  //			if( m.score < -1000 )  // This line is commented out for demonstration purposes
  //				continue;
  
  			// the return point is the template's top left corner
  			int x0 = m.x - r;
  			int y0 = m.y - r;
  			int x1 = x0 + w;
  			int y1 = y0 + h;
  
  			g2.drawLine(x0, y0, x1, y0);
  			g2.drawLine(x1, y0, x1, y1);
  			g2.drawLine(x1, y1, x0, y1);
  			g2.drawLine(x0, y1, x0, y0);
  		}
  	}
docs: Helper function will is finds matches and displays the results as colored rectangles