Measuring PSNR of full color video
AssigneeTektronix, Inc.
InventorKevin M. Ferguson
Life of this patent
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Abstract
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 GBR 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 GBR. 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.
Claims5
A method of measuring peak signal to noise ratio (PSNR) between reference and impaired full color videos comprising the steps of:
- converting the reference and impaired full color videos to RGB videos;
- and
- computing the PSNR between the RGB videos to obtain a full color PSNR value.
A method of obtaining a color error map between reference and impaired full color videos having a luminance component and chrominance components comprising the steps of:
- for each component obtaining a difference value between an impaired value and a reference value for each pixel of a frame of the full color videos;
- for each chrominance component adding the difference values to a pedestal;
- and
- if the luminance difference values are near zero, adding sufficient luminance to make the chrominance components visible in the color error map.
Dependencies are inferred from the claim text.