Apparatus and method for predicting subjective quality of compre

Details Apparatus and method for predicting subjective quality of compre Apparatus and method for predicting subjective quality of compre

1993-10-26

1998-08-04

Couso, Jose L.

Image analysis

Image sensing

Optical

G06K 936

Patent

active

057907170

ABSTRACT:
An apparatus and method are described for predicting a subjective quality rating associated with a reference image compressed at a given level. My apparatus includes components for, and my method includes steps of, storing a digitized color image representing a reference image in memory and compressing at a given level and decompressing the reference image to produce a processed image. My apparatus and method also entail converting the reference image and the processed image each to a grayscale image and dividing each grayscale image into an array of blocks. My apparatus and method further entail generating a first intensity variance array corresponding to the array of blocks of the grayscale reference image and a second intensity variance array corresponding to the array of blocks of the grayscale processed image. Lastly, my apparatus and method entail generating a variance ratio based on the first and second intensity variance arrays, determining a block variance loss based on the variance ratio, and generating the subjective quality rating indicated by the impairment level which is based on the variance loss.

REFERENCES:
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patent: 5282255 (1994-01-01), Bovik et al.
"Moving Picture Group MPEG: A Video Compression Standard for Multimedia Applications," Didier LeGall Communications of the ACM, vol. 34, No. 4, Apr. 1991.
"Codec for Audiovisual Services at n .times. 384 kbit/s," CCITT H.261, Rec. H.261, pp. 120-128, 1988.
"The JPEG Still Picture Compression Standard," Communications of the ACM, G. K. Wallace, pp. 30-44, Apr. 1991.

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