Measuring PSNR of full color video
View Patent ↗A method of measuring peak signal to noise ratio (PSNR) of full color video, both total and component contributions as well as providing PSNR full color and component maps includes converting the components of the full color video for both reference and impaired video signals to RGB values, and computing the error energy for each of the G, B and R channels between the reference and impaired video signals. Each component contribution to the error for the full color video components is assessed by setting the other components to a reference value, such as zero. Also the total full color PSNR is computed in RGB. Finally a color residual PSNR map is generated and displayed together with the computed PSNR results to enable a user to visualize where the significant impairments occur in the impaired video.
1. A picture quality analyzer having a display according to the method of displaying a color error map between a reference full color video signal and an impaired full color video signal produced by a picture quality analyzer comprising the steps of:
calculating a difference value between an impaired value and a reference value for each pixel of a frame of each full color video having a luminance component and chrominance components obtained from the reference full color video signal and the impaired full color video signal, for each chrominance component adding the difference values to a pedestal;
adding sufficient luminance as a function of the chrominance difference values to make the chrominance components visible in the color error map; and
displaying the color error map.
2. A picture quality analyzer having a display according to the method of measuring peak signal to noise ratio (PSNR) between reference and impaired full color video signals having a luminance component and chrominance components produced by a picture quality analyzer comprising the steps of:
converting the reference and impaired full color video signals to RGB videos;
measuring the PSNR between the RGB videos to obtain a full color PSNR value;
computing an error for each component of the RGB video;
assessing each component contribution to produce a PSNR value for each component; and
generating a color error map between the reference and impaired full color videos for display;
wherein the generating a color error map step comprises the steps of:
obtaining difference values for each of the chrominance components of the full color videos;
adding the difference values to a pedestal;
adding sufficient luminance to make the chrominance components visible in the color error map; and
displaying the color error map.
3. A picture quality analyzer having a display according to the method of measuring peak signal to noise ratio (PSNR) between reference and impaired full color video signals having a luminance component and chrominance components produced by a picture quality analyzer comprising the steps of:
converting the reference and impaired full color video signals to RGB videos;
measuring the PSNR between the RGB videos to obtain a full color PSNR value; and
generating a color error map between the reference and impaired full color videos for display;
wherein the generating a color error map step comprises the steps of:
obtaining difference values for each of the chrominance components of the full color videos;
adding the difference values to a pedestal;
adding sufficient luminance to make the chrominance components visible in the color error map; and
displaying the color error map.