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.
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.