What are the ready-made libraries for comparing two images in .NET?

Question

Images

There is an original picture and n copies. Copies may be cropped and saved in a different format/quality. We need a library - it accepts two pictures as input, yes or no as output (these are two thumbnails of one image or not)

Answer 1

such a library probably does not exist, because an extremely specific problem that does not have an ideal solution, in this case, can only be probabilistically assessed as similar/dissimilar. And here again the question arises, what does it mean sprinkled? If you mean truncated, then the algorithm becomes even more complicated, because you have to look for the entry of the first into the second. Moreover, if it also means changing the size of the copy that has been cropped, then it is not known which of them is embedded in which, the task is comparable in complexity to collecting mosaics. It is necessary to define the task more precisely and look for libraries suitable for them, for example, if the task is set as follows: there is an original and there is a set of obviously worse copies (differing in size and quality / uncut), then the solution comes down to resizing the original, say, to a size of 512x512 and a copy to that the same size