Apparatus for effecting A/D conversation on image signal

Details Apparatus for effecting A/D conversation on image signal Apparatus for effecting A/D conversation on image signal

1997-01-24

1998-09-15

Vu, Kim Yen

Image analysis

Image compression or coding

Gray level to binary coding

382224, 3582612, 358430, 358433, 358445, 358462, 358467, H04N 1417, H04N 1415, H04N 140, G06K 936

Patent

active

058091750

ABSTRACT:
An apparatus for coding an input analog video signal to a digital code. The apparatus comprises an A/D converter for converting the input analog video signal to a first quantization code having a first number of bits, a class sorting circuit supplied with the first quantization code from the A/D converter, for effecting a class sorting process on a plurality of pixels including a pixel to be marked, based on the first quantization code corresponding to the pixel and the first quantization code corresponding to each of the pixels provided near the periphery of the pixel, and a quantizing circuit supplied with the first quantization code produced from the A/D converter and the result of class sorting by the class sorting means, for adaptively converting the first quantization code into a second quantization code having a second number of bits smaller than the first number of bits, based on the result of class sorting by the class sorting circuit.

REFERENCES:
patent: 4516262 (1985-05-01), Sakurai
patent: 4606069 (1986-08-01), Johnsen
patent: 5086484 (1992-02-01), Katayama et al.
patent: 5109436 (1992-04-01), Machida et al.
patent: 5548415 (1996-08-01), Tanaka et al.

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