System information (version)

• OpenCV => master

Detailed description

cv::Affine3DEstimatorCallback::checkSubset checks the
collineartiy for both source points and destination points, but
the check is missing for the destination points
in cv::Affine2DEstimatorCallback::checkSubset.

Although the comment says that only
the check for source points is enough,
the destination points should also be checked
to remove outliers.