This program can semi-automatically vectorize a scanned (or born-digital, but raster) graph so that the result it can be further processed with Matlab.
Jan Hadacek (2020). GraphTrace (https://www.mathworks.com/matlabcentral/fileexchange/54823-graphtrace), MATLAB Central File Exchange. Retrieved .
More examples, clean-up of the source.
Inspired by: Hessian based Frangi Vesselness filter