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The norms are used for BFMatching (BruteForce). As you can see it is mentioned here:
"For BF matcher, first we have to create the BFMatcher object using cv2.BFMatcher(). It takes two optional params. First one is normType"
while,
"For FLANN based matcher, we need to pass two dictionaries which specifies the algorithm to be used, its related parameters etc. First one is IndexParams. For various algorithms, the information to be passed is explained in FLANN docs."
