Created
November 23, 2020 15:26
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Match keyframes and keep the good matches
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# Match keypoints in both images | |
# Based on: https://docs.opencv.org/master/dc/dc3/tutorial_py_matcher.html | |
FLANN_INDEX_KDTREE = 1 | |
index_params = dict(algorithm=FLANN_INDEX_KDTREE, trees=5) | |
search_params = dict(checks=50) # or pass empty dictionary | |
flann = cv.FlannBasedMatcher(index_params, search_params) | |
matches = flann.knnMatch(des1, des2, k=2) | |
# Keep good matches: calculate distinctive image features | |
# Lowe, D.G. Distinctive Image Features from Scale-Invariant Keypoints. International Journal of Computer Vision 60, 91–110 (2004). https://doi.org/10.1023/B:VISI.0000029664.99615.94 | |
# https://www.cs.ubc.ca/~lowe/papers/ijcv04.pdf | |
matchesMask = [[0, 0] for i in range(len(matches))] | |
good = [] | |
pts1 = [] | |
pts2 = [] | |
for i, (m, n) in enumerate(matches): | |
if m.distance < 0.7*n.distance: | |
# Keep this keypoint pair | |
matchesMask[i] = [1, 0] | |
good.append(m) | |
pts2.append(kp2[m.trainIdx].pt) | |
pts1.append(kp1[m.queryIdx].pt) |
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