Как сравнить два изображения?

// Matching
        DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_HAMMING);
        MatOfDMatch matches = new MatOfDMatch();
        matcher.match(descriptors1, descriptors2, matches);

        List<DMatch> matchesList = matches.toList();
        Double max_dist = 0.0;
        Double min_dist = 100.0;

        for (DMatch dMatch : matchesList) {
            Double dist = (double) dMatch.distance;
            if (dist < min_dist)
                min_dist = dist;
            if (dist > max_dist)
                max_dist = dist;
        }
        List<DMatch> good_matches = new ArrayList<DMatch>();
        for (DMatch aMatchesList : matchesList) {
            if (aMatchesList.distance <= (1.5 * min_dist))
                good_matches.add(aMatchesList);
        }