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Hi! MatOfKeyPoint just extends Mat (you can check implemetation in src/org/opencv/core/MatOfKeyPoint.java folder of your OpenCV android sdk). So, in native side, it just a Mat with CV_32FC7 type. Try to cast it to Mat in usual way.

Hi! MatOfKeyPoint just extends Mat (you can check implemetation in src/org/opencv/core/MatOfKeyPoint.java folder of your OpenCV android sdk). So, in native side, it just a Mat with CV_32FC7 type. Try to cast it to Mat in usual way.