message: i9629 - Added actual documentation for cv::PSNR function
diff: @@ -690,10 +690,21 @@ CV_EXPORTS_W double norm(InputArray src1, InputArray src2,
  */
  CV_EXPORTS double norm( const SparseMat& src, int normType );
  -/** @brief computes PSNR image/video quality metric
  +/** @brief Computes the Peak Signal-to-Noise Ratio (PSNR) image quality metric.
  +
  +This function calculates the Peak Signal-to-Noise Ratio (PSNR) image quality metric in decibels (dB), between two input arrays src1 and src2. Arrays must have depth CV_8U.
  +
  +The PSNR is calculated as follows:
  +
  +\f[
  +\texttt{PSNR} = 10 \cdot \log_{10}{\left( \frac{R^2}{MSE} \right) }
  +\f]
  +
  +where R is the maximum integer value of depth CV_8U (255) and MSE is the mean squared error between the two arrays.
  +
  +@param src1 first input array.
  +@param src2 second input array of the same size as src1.
  -see http://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio for details
  -@todo document
  */
  CV_EXPORTS_W double PSNR(InputArray src1, InputArray src2);
  