Apparatus for effecting A/D conversion on image signal

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

1994-06-14

1997-03-11

Coles, Sr., Edward L.

Image analysis

Pattern recognition

Classification

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

Patent

active

056109989

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: 5107345 (1992-04-01), Lee
patent: 5166987 (1992-11-01), Kageyama
patent: 5307177 (1994-04-01), Shibata et al.
IEEE International Conference On Communications Bostonicc/89, vol. 3, 14 Jun. 1989, Boston pp. 1355-1359 H. Sun et al. `Adaptive Interleaved Vector Quantization For Image Transmission` par. 3; figures 1-3.

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