title: Sikulix cannot find target image
body: <p>I am using Sikulix.jar to search images in my project. My code is as follows: </p>
  
  <pre><code>Finder f;
  Match m;
  Points2D coords = new Point2D.Double(-1, -1);
  try {
      f = new Finder(ImageIO.read(new File("my_large_image.png")));
      f.find(ImageIO.read("my_sub_image.png"));
      if (f.hasNext()) {
          m = f.next();
          coords.setLocation(m.getTarget().getX(), m.getTarget().getY());
      }
  } catch (IOException e) {}
  </code></pre>
  
  <p>The image to be found is just a part of the large image. However the coords always returns (-1, -1). Any helps about the implementation? Thank you.</p>
  
  <p>Update 11/25
  I may found a solution but I do not know if it is correct. The image is found when I scale my testing large image down (from 1080*1920 to 540*960). But the similarity is 0.66.</p>