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Visualize matched keypoints
# Draw the keypoint matches between both pictures
# Still based on: https://docs.opencv.org/master/dc/dc3/tutorial_py_matcher.html
draw_params = dict(matchColor=(0, 255, 0),
singlePointColor=(255, 0, 0),
matchesMask=matchesMask[300:500],
flags=cv.DrawMatchesFlags_DEFAULT)
keypoint_matches = cv.drawMatchesKnn(
img1, kp1, img2, kp2, matches[300:500], None, **draw_params)
cv.imshow("Keypoint matches", keypoint_matches)
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