SIFT detector returns duplicate keypoints

asked 2014-10-06 08:47:34 -0600

nekiman
21 ●2

updated 2014-10-06 08:48:14 -0600

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.

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answered 2014-10-06 09:29:38 -0600

Siegfried
1393 ●10 ●26

Hi, this is the behavior as described in the original SIFT paper Distinctive Image Features from Scale-Invariant Keypoints from David Lowe in section: 5 Orientation assignment on page 13.