System information (version)

• OpenCV => 4.5

Detailed description

There seems to be a license issue in https://github.com/opencv/opencv/blob/master/modules/features2d/include/opencv2/features2d.hpp.

It states:

- the color image algorithm is taken from: @cite forssen2007maximally ; it should be much slower
than grey image method ( 3~4 times ); the chi_table.h file is taken directly from paper's source
code which is distributed under GPL.

The chi table can be found in mser.cpp as chitab3.

This would force the code to be under GPL.

This was already discussed in https://answers.opencv.org/question/31718/opencv-247-gpl-licensing-issue-with-msercpp/. But no fix was ever done.