MapValue          231 samples/gpu/opticalflow_nvidia_api.cpp             (row + j * flowField->nChannels)[1] = static_cast<unsigned char> (MapValue (-(*ptr_v), -maxDisplacement, maxDisplacement, 0.0f, 255.0f));
MapValue          232 samples/gpu/opticalflow_nvidia_api.cpp             (row + j * flowField->nChannels)[2] = static_cast<unsigned char> (MapValue (*ptr_u   , -maxDisplacement, maxDisplacement, 0.0f, 255.0f));