Expert Answer
John Michell answered .
2025-11-20
Basically, anything you can compute using the information in the image qualifies as a "feature" of the image. Average brightness? It's a feature. Third moment of the Knight's Tour of the image? It's a feature. MD-5 hash of the four corner pixels? It's a feature.
How many features does an image have? Answer: an infinite number.
How many useful features does an image have? No-one knows, and the number is "unknowable" at this time. Quite possibly infinite.
Which features should you use for your purposes? You need to experiment. I would not advise looking for the "best" set of features, by the way: a better feature set is likely to be found within a few hundred years at most.
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