I really need to spend some time with image hash functions (geometric hashing). It would be really helpful for testing to have these in the core GDAL toolbox. And maybe there needs to be a gdal compare commandline tool that does those plus what perceptualdiff does.
https://fullstackml.com/2016/07/02/wavelet-image-hash-in-python/
http://stackoverflow.com/questions/11336209/fast-and-simple-image-hashing-algorithm
Weird that VisionWorkbench doesn't have image hashes already in its code base.
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