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On Nov 20, 2012, at 2:54 PM, Kyle Banerjee wrote: > My real question is whether anyone has come up with a really good way to > assign metadata to thousands of photos, preferably in batch fashion? Thanks, There's a whole field of what they call 'computer vision', which is basically looking for things in images. (face detection is just a small subset of it): http://en.wikipedia.org/wiki/Computer_vision Most of the ones that I know of work with very constrained images (they're all pictures of the sun, at a known pixel scale, so they know what size/scale the items are that they're looking for) The various 'find similar image' engines might be useful to do some sort of clustering of the images to make them easier to process. (eg, extract landscapes vs. buildings vs. people) Wikipedia has a list of various implementations: http://en.wikipedia.org/wiki/List_of_CBIR_engines -Joe