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Yes, i actually took a look at the code and this is not really clear how dense keypoint detection is performed. Documentation should be completed to help user not going into wrong stuff.
It seems that by default, the scale parameter of keypoints starts with value=1 and scaling factor is lower than 1. Some questions remain, one important being : _depending on the descriptor that is used how does it react ? => for example SIFT with scale=1, Does OpenCV SIFT understand native SIFT size or does it force less ?
