Dense Grid of HOG keypoints

[scottclowe]

Sample the image in intervals of 8 pixels in each dimension as "dummy keypoints", and describe each 16 pixel patch with a Histogram of Oriented Gradients.

As performed in this paper:
http://web.engr.oregonstate.edu/~tgd/publications/WACV2011-stacked-spatial-pyramid.pdf

Can be implemented with OpenCV or with skimage.

[scottclowe]

Actually, I think HOG is in skimage but not OpenCV.
http://scikit-image.org/docs/0.10.x/api/skimage.feature.html#hog

Correct me if I'm wrong, Dragos.