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How to improve homography

Hi guys, I'm implementing manually a stitcher from a video.Here's the problem: often,it seems that the homography isn't stimated correctly.I say this because when I'm going to stitch the new frame to the mosaic, only a part fits well, and the other part seems "sliced". How can I improve the ransac algorithm for getting better results? I'm using opencv 3 with AKAZE, with a threshold of 0.00001 (it's very low but it work a lot better respect to SURF!!!) and I'm calculating the homography with this parameters:

Mat H = findHomography(obj, scene, RANSAC,2.5);

(I've read the 2.5 from AKAZE paper)

Hope someone could help