Raster image data compression method and system

Details Raster image data compression method and system Raster image data compression method and system

1995-01-31

1997-07-15

Coles, Sr., Edward L.

395115, G06K 1500

Patent

active

056490747

ABSTRACT:
Data compression apparatus includes a current block of data bytes and a logic circuit for determining whether each byte in the current block is the same or different from a seed value. An encoding circuit produces a compressed version of the current block, which includes Command bytes and continuous literal data bytes from the current block. Each Command byte has an encoding identifier, an offset count and a data segment replacement count. Each offset count and data segment replacement count have, respectively, maximum bit sizes (and values). The encoding circuit responds to an indication that a data segment (1) differs from the seed value and (2) is followed by a series of contiguous data segments that are different from the seed value, by causing (a) a first Command byte to manifest a data segment replacement count of the maximum value and an offset count of 0 and to be followed by at least one of the contiguous data segments from the series. Thereafter, a next Command byte occurs if the remaining number of contiguous data segments exceeds the maximum value of the data segment replacement count. The next Command byte(s) each manifest maximum value data segment replacement counts until the count value .ltoreq. the data segment Replacement count. If the offset count is: greater than the offset count maximum value, the offset count is set to its maximum value. Subsequent Command bytes follow until the remaining offset count value is .ltoreq. to the maximum value or a lesser value.

REFERENCES:
patent: 5060286 (1991-10-01), Miller
patent: 5452405 (1995-09-01), Vondran, Jr.

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