How to estimate and apply color correction matrix using a 24 block color card?

Question

I have a 24 block color card and I\'m trying to estimate a color correction matrix to the captured images with the said color card. I have manually estimated a CCM

Answer 1

color correction model you are using is well described here:

https://www.informatik.hu-berlin.de/de/forschung/gebiete/viscom/thesis/final/Studienarbeit_Behringer_201308.pdf

This can also be done in c++ opencv. You have to determine equation:

 [p1' p2' ... pn' ] = M * [ p1 p2 ... pn]
         P'         = M *        P

Where p1',...pn' are desired values (better if in XYZ color space), p1, ... pn are real values detected and M is 3x3 transformation matrix.

You could solve that system as follows:

M = P * P'.inv(CV_SVD)