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Java: dense SIFT?


I have written my Java code for the detection of keypoints using SIFT, as follows:

FeatureDetector featureDetector = FeatureDetector.create(FeatureDetector.SIFT);
MatOfKeyPoint keypoints = new MatOfKeyPoint();
featureDetector.detect(image, keypoints);

where image is a Mat variable containing the image.

However, I am not sure how to compute the dense SIFT descriptors, as contained in the PHOW computation of the VLFeat library. Is there a way of doing this?

Thank you in advance.