Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1995-03-02
1997-01-21
Brinich, Stephen
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358432, H04N 100
Patent
active
055964230
ABSTRACT:
A data compression and decompression procedure for a serial printer handles data from a print swath that includes Y rows of pixel data. The procedure divides the print swath into N microbands of pixel data, with each microband including y rows of pixel data (where y.times.N.gtoreq.Y). The procedure compresses each microband of the pixel data by breaking up the microband into microblocks and comparing data in each microblock with a seed value to arrive at a compressed microblock based upon data differences from the seed value. Each microblock comprises a block of pixel data that is m bits wide by y rows high, where m is a small fraction of M bits of pixel data that are printable by the printhead across a sheet. All microbands of a swath are subjected to the data compression procedure so as to create positionally corresponding sets of compressed data microblocks for all of the microbands. In preparation for printing, the procedure decompresses all N microbands of raster data by acting on each set of compressed microblocks to recreate a set of N microbands of decompressed pixel data. The procedure then feeds the N microbands of decompressed raster data, in parallel, to the printhead.
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patent: 4568983 (1986-02-01), Bobick
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patent: 5109439 (1992-04-01), Honda
patent: 5123061 (1992-06-01), Pritchard
patent: 5298990 (1994-03-01), Otaka et al.
patent: 5420693 (1995-05-01), Horiuchi et al.
Brinich Stephen
Hewlett--Packard Company
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