Are there any image comparison libraries similar to Google Image?

Question

Images

Hello, is there a library or API in the public domain or by subscription for comparing images?
Such a task exists, a huge number of images, for example 1kkk, we make their casts, load them into the database. Next, you need to take image B, you need to make a cast from it and find the most suitable one for it in the database

Answer 1

digiCam is able to find duplicate images in a collection using fuzzy comparison (snippets from the entire collection are created at some point in this process). I checked (a long time ago) that it is indeed able to find different images photoshopped from one, or different frames shot one after the other. Of course, false positives happen, but the level of "similarity" in the search can be set. On what libraries all this is built, I think, it will become clear after reading the source (opensource).