(JAVA) I am using Akaze to detect keypoints. I then prune keypoints according to few criteria. But passing those keypoints to the detectAndCompute method by setting the 'useProvidedKeypoints' flag to true, doesn't compute the descriptor. Instead the keypoint becomes null after calling the method. Please post the necessary fix.
Instead the keypoint becomes null after calling the method.
this means, no descriptors could be computed for your given keypoints (so the invalid ones were removed)
I then prune keypoints according to few criteria
this needs some explanation ? you're pruning unmatched keypoints ? why at all?
Please post the necessary fix.
hate to say so, but most probably you'll have to change your concept. maybe your pruning is broken ? maybe you can't do this with AKAZE keypoint ? noone knows,without more information
Sorry for not being clear, earlier. The below is a snippet of what I'm trying to do. By pruning, I meant I'm taking the top, say 40 keypoints by comparing the response field of the keypoints. I did run akaze with detectAndCompute() method and it worked as expected. Which is why, I thought of separating the methods to pick top keypoints. Please let me know if there's a much easier way to go about this. Thanks
descriptors = new Mat(); keypoints = new MatOfKeyPoint();
// Separate detect and compute
akaze.detect(logoMat, keypoints);
List<KeyPoint> kps= keypoints.toList().stream()
.sorted((KeyPoint k1, KeyPoint k2) -> ((Float)
k2.response).compareTo(((Float) k1.response)))
.collect(Collectors.toList());
kps= kps.subList(0, 40 > kps.size()? kps.size(): 40);
MatOfKeyPoint mkp= new MatOfKeyPoint();
mkp.fromList(kps);
// using from already detected keypoints
akaze.detectAndCompute(logoMat, new Mat(), mkp, descriptors, true);
Asked: 2019-04-22 05:18:31 -0600
Seen: 631 times
Last updated: Apr 22 '19