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Improve ORB for rescaling ? (opencv)

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Hi, I have to work on an application of image matching. I'm not specialized at all in image, but I do my best :) I'm currently replacing sift by another descriptor (and detector). I have used ORB/ORB, and the results are kinda good, except when there is some rescaling ... That's what I read about ORB, so i'm not surprised. I am wondering if there's some tests (algo, concept, test ...) to improve the behaviour, like the way ratio test or cross matching improve matching ? (I'm trying BRISK but the result I have at the moment are worse than ORB, though I still have to play with parameters) Thanks for any idea/advice :)

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