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Hello, I am using the SIFT detector to detect keypoints on an image. But, I am receiving a very big amount of them and I noticed that there are a lot of duplicates, where everything is the same, apart from the angle. Is this normal behaviour? I have attached an image showing some of them. Thanks in advance.

Hello, I am using the SIFT detector to detect keypoints on an image. But, I am receiving a very big amount of them and I noticed that there are a lot of duplicates, where everything is the same, apart from the angle. Is this normal behaviour? I have attached an image showing some of them. Thanks in advance.