Bit-plane coding device

Details Bit-plane coding device Bit-plane coding device

1996-05-30

1999-03-09

Couso, Jose L.

Image analysis

Image compression or coding

G06K 936

Patent

active

058811737

ABSTRACT:
A device encodes a multi-level image by coding bit planes obtained from the multi-level image. The device includes a gray-code-conversion unit converting the multi-level image into a gray-code representation, a bit-plane generating unit generating the bit planes from the gray-code representation, a data-reference unit extracting a current pixel and fixed reference pixels from a first one of the bit planes and extracting a floating reference pixel from a second one of the bit planes including the first one, and a coding unit coding a sequence of pixels extracted sequentially from the bit planes by using an entropy coding method. The entropy coding method uses as a coding parameter a probability of data occurrence of the current pixel, the probability of data occurrence being obtained based on the fixed reference pixels and the floating reference pixel.

REFERENCES:
patent: 4745743 (1988-05-01), Hall
patent: 5091977 (1992-02-01), Katata et al.
patent: 5335088 (1994-08-01), Fan
patent: 5471207 (1995-11-01), Zandi et al.
patent: 5631977 (1997-05-01), Koshi et al.
patent: 5659631 (1997-08-01), Gormish et al.

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