Method and apparatus for compressing and extending an image

Details Method and apparatus for compressing and extending an image Method and apparatus for compressing and extending an image

1993-02-01

1994-10-18

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

348403, G06K 936

Patent

active

053575849

ABSTRACT:
An image evaluation circuit is connected to an image compression circuit and an image extension circuit. In the image evaluation circuit, original image data and extended image data reproduced from compressed image data are compared in each block pixel by pixel to generate block noise. The comparison is carried out twice to provide two block noises by two compression factors, and an optimum compression factor is determined in accordance with the two compression factors and the two block noises.

REFERENCES:
patent: 4754492 (1988-06-01), Malvar
patent: 4777620 (1988-10-01), Shimoni et al.
patent: 4825285 (1989-04-01), Speidel et al.
patent: 4903317 (1990-02-01), Nishihara et al.
patent: 5020120 (1991-05-01), Weldy
patent: 5021891 (1991-06-01), Lee

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