** ** This structure represent a keypoint as extracted by the SIFT ** filter ::VlSiftFilt.
< Integer unnormalized y coordinate.
< o coordinate (octave).
< Integer unnormalized x coordinate.
< y coordinate.
< s coordinate.
< Integer s coordinate.
< x coordinate.
See Implementation
** ** This structure represent a keypoint as extracted by the SIFT ** filter ::VlSiftFilt.