Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-08
1993-05-25
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 382 56, H04N 712
Patent
active
052145077
ABSTRACT:
A quantization parameter for use in encoding a region of an image is developed from a) a categorization of the region into one of a predetermined plurality of perceptual noise sensitivity (PNS) classes, b) a level of psycho-visual quality that can be achieved for the encoded version of the image, the level being selected from among a plurality of predetermined levels, and c) a prestored empirically derived model of the relationship between the PNS classes, the psycho-visual quality levels and the values of the quantization parameter. PNS indicates the amount of noise that would be tolerable to a viewer of the region, i.e., the perceptual sensitivity of the region to noise. Some characteristics on which PNS classes may be based are: spatial activity, speed of motion, brightness of the region, importance of the region in a particular context, the presence of edges within the region and the texture of the region, e.g., from "flat" to "highly textured". PNS classes that include combinations of the characteristics of a region of the image may also be defined. The PNS classes employed are selected by the implementor and may be determined empirically. The psycho-visual quality of an encoded image is the quality, as perceived by a viewer, of the version of the image that is reconstructed from the encoded image. It is determined from the complexity of the image and the bit-rate available to encode the image.
REFERENCES:
patent: 4780761 (1988-10-01), Daly et al.
patent: 5113256 (1992-05-01), Citta et al.
Aravind Rangarajan
Hang Hsueh-Ming
Haskell Barin G.
Puri Atul
AT&T Bell Laboratories
Kostak Victor R.
Rosenthal Eugene J.
Slusky Ronald D.
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