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Distinctive Image Features from Scale-Invariant Keypoints: Difference between revisions
Distinctive Image Features from Scale-Invariant Keypoints (view source)
Revision as of 17:49, 4 December 2020
, 4 December 2020→Orientation assignment
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===Keypoint localization=== | ===Keypoint localization=== | ||
===Orientation assignment=== | ===Orientation assignment=== | ||
* For every keypoint, take a patch around the keypoint and compute a gradient (norm, angle) for each pixel in the patch. | |||
* Build a histogram of gradients, binned along angles. Smooth this histogram by fitting a parabola to 3 values closest to each peak. | |||
* The peak of the histogram is the ''dominant orientation'' | |||
===Keypoint descriptor=== | ===Keypoint descriptor=== | ||