SIFT Orientations in Opencv Implementation

asked 2017-03-08 03:05:52 -0600

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In the OpenCV implementation of SIFT, keypoints has (angles) in degrees (ranging from 180 to -180), which represents the calculated orientations for these keypoints. Since SIFT assign the dominant orientation of a keypoint using 10 degrees bins in a histogram, how we can get this range of angles? shouldn't the values be in 10 degrees steps?

Is that because of the histogram smoothing?

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