Implementation of Color to GrayScale method CorrC2G #140
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Implementation of CorrC2G: Color to Gray Conversion by Correlation from paper:
https://ieeexplore.ieee.org/abstract/document/8048003
Matlab implementation can be found on:
https://www.mathworks.com/matlabcentral/fileexchange/64628-corrc2g-color-to-gray-conversion-by-correlation
Surprisingly this simple method based on correlation gives very good resulsts.
Examples: