VL_PLOTSIFTDESCRIPTOR(D) plots the SIFT descriptor D. If D is a matrix, it plots one descriptor per column. D has the same format used by VL_SIFT().
VL_PLOTSIFTDESCRIPTOR(D,F) plots the SIFT descriptors warped to the SIFT frames F, specified as columns of the matrix F. F has the same format used by VL_SIFT().
H=VL_PLOTSIFTDESCRIPTOR(...) returns the handle H to the line drawing representing the descriptors.
The function assumes that the SIFT descriptors use the standard configuration of 4x4 spatial bins and 8 orientations bins. The following parameters can be used to change this:
- NumSpatialBins 4
Number of spatial bins in both spatial directions X and Y.
- NumOrientationBins 8
Number of orientation bis.
- MagnificationFactor 3
Magnification factor. The width of one bin is equal to the scale of the keypoint F multiplied by this factor.
See also: VL_SIFT(), VL_PLOTFRAME(), VL_HELP().