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[FRAMES,DESCRS] = <a href="VL_DSIFT.html">VL_DSIFT</a>(I) extracts a dense set of SIFT
keypoints from image I. I must be of class SINGLE and grayscale.
FRAMES is a 2 x NUMKEYPOINTS, each colum storing the center (X,Y)
of a keypoint frame (all frames have the same scale and
orientation). DESCRS is a 128 x NUMKEYPOINTS matrix wi