hi everyone, I am new to OpenCV and I am trying to write an android code using OpenCV to compare two images for similarities, for my example i loaded two images from Drawable folder as you see in the code, but i am not able to complete the code in order to get a percentage of matching between images and to set a threshold or something? so please can any one help me solving my issue, thank you in advance. below is my Code:
public class MainActivity extends AppCompatActivity {
//TextView textView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
System.loadLibrary("opencv_java3");
// textView =(TextView)findViewById(R.id.textView);
Mat m1 = Imgcodecs.imread(ResourcesCompat.getDrawable(getResources(), R.drawable.image1, null).toString());
Mat m2 = Imgcodecs.imread(ResourcesCompat.getDrawable(getResources(), R.drawable.image2, null).toString());
//Imgproc.cvtColor(m1, m1, Imgproc.COLOR_RGB2BGRA);
//Imgproc.cvtColor(m2, m2, Imgproc.COLOR_RGB2BGRA);
FeatureDetector detector = FeatureDetector.create(FeatureDetector.ORB);
MatOfKeyPoint keypoints1 = new MatOfKeyPoint();
detector.detect(m1, keypoints1);
FeatureDetector detector2 = FeatureDetector.create(FeatureDetector.ORB);
MatOfKeyPoint keypoints2 = new MatOfKeyPoint();
detector2.detect(m2, keypoints2);
DescriptorExtractor extractor = DescriptorExtractor.create(DescriptorExtractor.ORB);
Mat descriptors1 = new Mat();
extractor.compute(m1, keypoints1, descriptors1);
DescriptorExtractor extractor2 = DescriptorExtractor.create(DescriptorExtractor.ORB);
Mat descriptors2 = new Mat();
extractor2.compute(m2, keypoints2, descriptors2);
DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_HAMMING);
MatOfDMatch matches = new MatOfDMatch();
matcher.match(descriptors1, descriptors2, matches);
List<DMatch> matchesList = matches.toList();
double maxDistance = 0;
double minDistance = 1000;
int rowCount = matchesList.size();
for (int i = 0; i < rowCount; i++)
{
double dist = matchesList.get(i).distance;
if (dist < minDistance) minDistance = dist;
if (dist > maxDistance) maxDistance = dist;
}
List<DMatch> goodMatchesList = new ArrayList<DMatch>();
double upperBound = 1.6 * minDistance;
for (int i = 0; i < rowCount; i++)
{
if (matchesList.get(i).distance <= upperBound)
{
goodMatchesList.add(matchesList.get(i));
}
}
MatOfDMatch goodMatches = new MatOfDMatch();
goodMatches.fromList(goodMatchesList);
}
