check_costCoeffNxN 2698 source/test/pixelharness.cpp         if (!check_costCoeffNxN(ref.costCoeffNxN, opt.costCoeffNxN))
check_costCoeffNxN  122 source/test/pixelharness.h     bool check_costCoeffNxN(costCoeffNxN_t ref, costCoeffNxN_t opt);