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HOG = <a href="vl_hog.html">VL_HOG</a>(IM, CELLSIZE) computes the HOG features for image IM
and the specified CELLSIZE. IM can be either grayscale or colour
in SINGLE storage class. HOG is an array of cells: its number
of columns is approximately the number of columns of IM divided
by CELLSIZE and the same for the number of rows. The third
dimension spans the feature compoents.
<