| http://www.w3.org/ns/prov#value | - Multiple images of the third stack are compressed into icons of p???p pixels, where n=p???q and q is an integer, by dividing each image into p tiles of q???q pixels, selecting q pixels from each tile, where each of said selected q pixels is representative of predetermined directional orientations within the tile, and calculating the mean value of the selected q pixels to produce a pixel representa
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