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R = Det(M) – k Tr(M)2 is the Harris Corner Detector.
SIFT Detector Scale-Invariant Feature Transform (SIFT) is another technique for detecting local features. The Harris Detector, shown above, is rotation-invariant, which means that the detector can still distinguish the corners even if the image is rotated.
K is an emppirically determined constant; k = 0.04 − 0.06. Page 20. Harris corner detector algorithm. -Compute magnitude of the gradient everywhere in x. and y directions.
A Harris Corner Point Detector was used to find keypoints. The basic intuition behind the Harris Detector is that sliding a small window over the image causes graident change in different directions. This can be used to detect corners as shifting the window in any direction will result in a large change.
The KSize class defines the size of a two-dimensional object using integer point precision.
Harris corner detector aims at locating key points for sparse feature matching by using local maxima in rotationally invariant scalar measures which is derived from the auto-correlation matrix. This technique uses a Gaussian weighting window making the detector response insensitive to in-plane image rotations.
Compared to its predecessor, Harris' corner detector takes the differential of the corner score into account with reference to direction directly, instead of using shifting patches for every 45 degree angles, and has been proved to be more accurate in distinguishing between edges and corners.