Graphics images data compression method

Details Graphics images data compression method Graphics images data compression method

H - Electricity

04

N

350/33

H04N 1/417 (2006.01) H04N 1/415 (2006.01)

Patent

CA 1317022

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 (14,66) 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 (18) any differences as relative offset and replacement bytes. The byte-group-by-byte-group basis compares (76) different byte groups within a single raster row, and thereby detects repetitions within the row itself.

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