Compression of grey scale images of text

Details Compression of grey scale images of text Compression of grey scale images of text

1996-01-04

2000-07-11

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

348420, 358539, 358433, 382166, 382194, 382246, G06T 900

Patent

active

060880392

ABSTRACT:
An image stored in a memory of a computer as pixels, each pixel including a bit pattern to indicate a grey-scale level. The image is compressed by grouping the pixels of the image into a plurality of regularized groups of pixels. The partitioning of the image can be in groups of four by four adjacent pixels. Groups of pixels having identical bit patterns are identified. The groups of pixels are encoded according to a frequency of groups of pixels having identical bit patterns.

REFERENCES:
patent: 4783841 (1988-11-01), Crayson
patent: 5408542 (1995-04-01), Callahan
patent: 5452104 (1995-09-01), Chong
patent: 5481364 (1996-01-01), Ito

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