I want to use a flann-based matcher in Python as described in http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_feature2d/py_matcher/py_matcher.html
Since I am using OpenCV 3.0.0, I had to adjust the code regarding the initialization of the SIFT detector. The rest is taken without changes
def calculateMatch(self):
# Initiate SIFT detector
sift = cv2.xfeatures2d.SIFT_create()
# find the keypoints and descriptors with SIFT
(kp1, desc1) = sift.detectAndCompute(self.image1,None)
(kp2, desc2) = sift.detectAndCompute(self.image2,None)
# FLANN parameters
FLANN_INDEX_KDTREE = 0
index_params = dict(algorithm = FLANN_INDEX_KDTREE, trees = 5)
search_params = dict(checks=50) # or pass empty dictionary
flann = cv2.FlannBasedMatcher(index_params,search_params)
matches = flann.knnMatch(desc1,desc2,k=2)
When I run the code, I get the following message:
cv2.error: cv2.cpp:161: error: (-215) The data should normally be NULL! in function allocate
in the line:
matches = flann.knnMatch(desc1,desc2,k=2)
One more comment:
If I use brute force matcher, everything works fine:
bf = cv2.BFMatcher()
matches = bf.knnMatch(desc1, desc2, k=2)
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