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Could you link to it please?

I've not tried it on anything else, but I remember thinking that it has a lot of potential uses. Also I only used it on gray-scale features, but I'm sure it could make use of full RGB too. I'll have to try it some time!

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"We also investigated hierarchical features where the image is overlaid with a grid of cell size c × c and pixels withins each cell are added up. This is same as downsampling the image and using the raw pixels in the downsampled image as features." (p. 3)

http://www.eecs.berkeley.edu/Pubs/TechRpts/2009/EECS-2009-15...

Sounds similar to one level of a pyramid:

https://en.wikipedia.org/wiki/Pyramid_(image_processing)

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