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image comparison with a database

Im not yet an Open CV user, Ive been using Matlab but Ive kept an eye in OpenCV for a while already. That being said, I would like to know if its even possible to implement one idea I had for a pet project of mine, before delving deep into openCV and really learning the language.

My goal is to compare images (They`re going to have noise) with a database of images, and tell me if it finds a match. For instance:img1 img2

How would I even tell they're both similar? Are there algorithms I can implement to tell me that?

I suppose I should use some sort of noise reduction/edge detection first (I already tried some and had success with edge detection, actually). So, assuming I have a decent edge detection, how could I compare them?

Thanks in advance

image comparison with a database

Im not yet an Open CV user, Ive been using Matlab but Ive kept an eye in OpenCV for a while already. That being said, I would like to know if its even possible to implement one idea I had for a pet project of mine, before delving deep into openCV and really learning the language.

My goal is to compare images (They`re going to have noise) with a database of images, and tell me if it finds a match. For instance:img1 img2

How would I even tell they're both similar? Are there algorithms I can implement to tell me that?

I suppose I should use some sort of noise reduction/edge detection first (I already tried some and had success with edge detection, actually). So, assuming I have a decent edge detection, how could I compare them?

Thanks in advance