Selecting features from image data

摘要: SIFT features are selected from an input image. A procedure is applied to the image obtain candidate keypoints. For each keypoint, there calculation of a first Laplacian value (L u ) for pixels in upper Scale Space and second l lower Space, based on position keypoint. keypoint discarded if L c less than or equal either . In case that not discarded, keypoint's strength s calculated, relative change One more keypoints as corresponding strength.