Two dimensional context model obtained without a line buffer for

Details Two dimensional context model obtained without a line buffer for Two dimensional context model obtained without a line buffer for

1996-08-26

1998-04-28

Boudreau, Leo

Image analysis

Pattern recognition

Context analysis or word recognition

382247, G06K 900

Patent

active

057456038

ABSTRACT:
An encoding method that allows the use of previous line data without requiring multiple accesses to the image or the use of a line buffer. The image, which is to be compressed, is divided into columns. Each column is traversed vertically. Each row within a column is compressed by horizontally moving across the row. After a row is compressed the next row in transferred to the compressor. Once a column is compressed, the compressor continues at the top of the next column. This process continues until all the columns have been compressed. By vertically traversing through the image, information about the previous row is limited by the width of the column. This limited storage of the previous row allows use of a two dimensional context model, which greatly increases the compression ratio.

REFERENCES:
patent: 4463380 (1984-07-01), Hooks, Jr.
patent: 4785349 (1988-11-01), Keith et al.
patent: 5299197 (1994-03-01), Schlafly
patent: 5381145 (1995-01-01), Allen et al.
patent: 5442458 (1995-08-01), Rabbani et al.

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