The sub-pixel locations are solved by forming a Taylor series representation
of the corner image values
Reference: Brown and Lowe "Invariant Features from Interest Point Groups"
BMVC 2002 pp 253-262
yang (2021). Sub-pixel locations in 2D image (https://www.mathworks.com/matlabcentral/fileexchange/33038-sub-pixel-locations-in-2d-image), MATLAB Central File Exchange. Retrieved .
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