Television – Monitoring – testing – or measuring
Patent
1995-10-12
1996-11-12
Kostak, Victor R.
Television
Monitoring, testing, or measuring
348395, H04N 1700
Patent
active
055745008
ABSTRACT:
A sync controller 14 controls an amount of delay of a delay part 15 so that original video data entered from a video source 1 is synchronized with reproduced video data which is compressed and reproduced by a system to be evaluated. A first OT calculator 17 orthogonally transforms a reproduced image, a second OT calculator 21 orthogonally transforms an original image and a subtractor 19 obtains a difference value of the same order coefficients in one block. A WSNR calculator 22 weights the difference with a weighting function which varies with a position of a coefficient of orthogonally transformed data and a magnitude of an AC power in the block after orthogonal transform of the original image and subsequently obtains an average weighted S/N ratio of each video frame or a plurality of video frames. Finally, a subjective evaluation value calculator 23 calculates a subjective evaluation value (deterioration percentage) according to the average weighted S/N ratio. Consequently, the present invention enables to provide a video quality evaluating equipment for a reproduced image of a video signal subject to digital compression capable of economically evaluating the video quality in a short period of time.
REFERENCES:
patent: 4953019 (1990-08-01), Skikakura et al.
patent: 5051827 (1991-09-01), Fairhurst
patent: 5499050 (1996-03-01), Baldes et al.
Hamada Takahiro
Matsumoto Shuichi
Kokusai Denshin Denwa Kabushiki Kaisha
Kostak Victor R.
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