OpenCV Python : No drawMatchesknn function

2 down vote

The functions cv2.drawMatches and cv2.drawMatchesKnn are not available in newer versions of OpenCV 2.4. @rayryeng provided a lightweight alternative which works as is for the output of DescriptorMatcher.match. The difference with DescriptorMatcher.knnMatch is that the matches are returned as a list of lists. To use the @rayryeng alternative, the matches must be extracted into a 1-D list. For example, the Brute-Force Matching with SIFT Descriptors and Ratio Test tutorial could be amended as such: # BFMatcher with default params bf = cv2.BFMatcher() matches = bf.knnMatch(des1,des2, k=2) # Apply ratio test good = [] for m,n in matches: if m.distance < 0.75*n.distance: # Removed the brackets around m good.append(m) # Invoke @rayryeng's drawMatches alternative, note it requires grayscale images gray1 = cv2.cvtColor(img1,cv2.COLOR_BGR2GRAY) gray2 = cv2.cvtColor(img2,cv2.COLOR_BGR2GRAY) drawMatches(gray1,kp1,gray2,kp2,good)

转自  https://stackoverflow.com/questions/20172953/opencv-python-no-drawmatchesknn-function   参考链接：