find ridges in a 2D image by using local Hessian matrices to find directions of salient lines (via eigen decomposition of the hessian). The eigenvectors describe directions of the double-derivative locally around a pixel that are invariant to transformation (i.e. stable ridges or valleys).
Jordan Sorokin (2021). ridgefilt( img,L,sigma,alpha ) (https://www.mathworks.com/matlabcentral/fileexchange/67019-ridgefilt-img-l-sigma-alpha), MATLAB Central File Exchange. Retrieved .
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