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Given a query image Q and two other images X and Y (you can assume they have more or less the same resolutions if that simplifies the problem), which algorithm would perform extremely well at determining which image between X and Y is most similar to Q, even when the differences are rather subtle? For example, a trivial case would be:

  • Q = image of mountains, X = image of mountains, Y = image of dogs, therefore it is clear that sim(Q,X) > sim(Q,Y).

However, examples of trickier cases would be:

  • Q = image of a yellow car, X = image of a red car, Y = image of a yellow car, therefore sim(Q,Y) > sim(Q,X) (assuming the car shapes are more or less the same).
  • Q = image of a man standing up in the middle with a black background, X = image of another man standing up in the middle with a black background, Y = image of a woman standing up in the middle with a black background, therefore sim(Q,X) > sim(Q,Y).

Which algorithm (or combination of algorithms) would be robust enough to handle even the tricky cases with very high accuracy?

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