getPSNR           136 samples/cpp/tutorial_code/HighGUI/video-input-psnr-ssim/video-input-psnr-ssim.cpp double getPSNR(const Mat& I1, const Mat& I2)
getPSNR           173 samples/cpp/tutorial_code/gpu/gpu-basics-similarity/gpu-basics-similarity.cpp double getPSNR(const Mat& I1, const Mat& I2)