Raster row and byte group graphics images data compression metho

Details Raster row and byte group graphics images data compression metho Raster row and byte group graphics images data compression metho

1989-01-19

1991-10-22

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 55, G06K 936

Patent

active

050602861

ABSTRACT:
The invented graphics images data compression method includes software which selectively compresses data on a raster-row-by-raster-row basis or on a byte-group-by-byte-group basis. The raster-row-by-raster-row basis compares bytes within adjacent raster rows and thereby detects repetitions between the rows. When data is compared on a raster-row-by-raster-row basis, the invented method records any differences as relative offset and replacement bytes. The byte-group-by-byte-group basis compares different byte groups within a single raster row, and thereby detects repetitions within the row itself.

REFERENCES:
patent: 4757352 (1988-07-01), Asano et al.
patent: 4791680 (1988-12-01), Yokoe et al.
patent: 4809350 (1989-02-01), Shimoni et al.
patent: 4825285 (1989-04-01), Speidel et al.
patent: 4932066 (1990-06-01), Nakayama et al.
patent: 4947448 (1990-08-01), Nakayama et al.

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