Could anyone enlighten me on what are the current best ways to detect if two images are the same (i.e. a copy or edited copy of each other)? What feature detection method do they use (SIFT, DWT, pixel intensity, etc.)?
I've read a lot of algorithms that focus on detecting similar objects and so on, but I am interested in reading on some for detecting whether two images are copies of each other. I've done some googling and most algorithms/papers I've found are pre-2014 or are about detecting similar images, not exact copies.