Hi, I' ve tried to understand sift implementation in opencv.
In sift.cpp class there is 'calcSIFTDescriptor' method; here, there are two for cycles: for( i = 0; i < d+2; i++ ) {...} and for( i = -radius, k = 0; i <= radius; i++ ) {...}. What is their meaning? Also, do you know some web sites or some documents that explain (better than openCV tutorial or refman) how sift algorithm in opencv works?
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