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US 11,109,096 B2Granted
Determining a quality measure for a processed video signal
AssigneeGrass Valley Limited
InventorJonathan Diggins
Life of this patent
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Abstract
A method of determining a quality measure for a processed video signal generated from an original video signal. A statistical metric for a value for a set of pixels of the original video signal is determined, and the statistical metric for the value for a corresponding set of pixels of the processed video signal is also determined. The quality measure for the processed video signal is then determined by comparing the statistical metrics for the original video signal and the processed video signal.
Claims21
A method of determining a quality measure for a processed video signal generated from an original video signal, the method comprising:
- determining a statistical metric for a value for a set of pixels of the original video signal;
- determining the statistical metric for the value for a corresponding set of pixels of the processed video signal;
- comparing the statistical metric for the original video signal with the statistical metric for the processed video signal to determine a quality measure for the processed video signal that approximates a peak signal-to-noise ratio of the processed video signal;
- determining a level of clipping for the set of pixels of the original video signal having a luminance value that falls outside a clipping value range;
- determining a level of clipping for the corresponding set of pixels of the processed video signal having a luminance value that falls outside the clipping value range;
- calculating a difference between the determined level of clipping between the original video signal and the determined level of clipping between the processed video signal;
- and
- modifying the quality measure for the processed video signal using the calculated difference between the respective levels of clipping for the original video signal and the processed video signal.
5 more elements
A system for determining a quality measure for a processed video signal generated from an original video signal, comprising:
- a first video signal fingerprint generator configured to receive the original video signal as an input video signal and output fingerprint data for the input video signal that includes a statistical metric for a value for a set of pixels of the original video signal and a level of clipping for the set of pixels of the original video signal that have a luminance value that falls outside a clipping value range;
- a second video signal fingerprint generator configured to receive the processed video signal as an input video signal and output fingerprint data for the input video signal that includes a statistical metric for a value for a set of pixels of the processed video signal and a level of clipping for the set of pixels of the processed video signal that have a luminance value that falls outside a clipping value range;
- and
- a video signal quality measure determiner configured to:
- receive the fingerprint data output by the first and second video signal fingerprint generators;
- receive the statistical metric for the value for the set of pixels of the original video signal;
- receive the statistical metric for the value for the corresponding set of pixels of the processed video signal;
- compare the statistical metric for the original video signal with the statistical metric for the processed video signal to determine a quality measure for the processed video signal that approximates a peak signal-to-noise ratio of the processed video signal;
- obtain, from the fingerprint data received from the first video signal fingerprint generator, the level of clipping for the set of pixels of the original video signal having the luminance value that falls outside a clipping value range;
- obtain, from the fingerprint data received from the second video signal fingerprint generator, the level of clipping for the corresponding set of pixels of the processed video signal having the luminance value that falls outside the clipping value range;
- calculate a difference between the determined level of clipping of the original video signal and the determined level of clipping of the processed video signal, and
- modify the quality measure for the processed video signal using the calculated difference between the respective levels of clipping for the original video signal and the processed video signal.
9 more elements
Dependencies are inferred from the claim text.