Compression of binary halftones

Details Compression of binary halftones Compression of binary halftones

H - Electricity

04

N

350/7

H04N 1/41 (2006.01)

Patent

CA 2008370

ABSTRACT OF THE INVENTION: A system is described for reformatting halftone data for compression, wherein an original bilevel image is re- formatted to produce another bilevel image that allows vertical correlations to be recognized by the com- pression technique, thus improving compressibility dra- matically, with particular suitability for facsimile transmissions. In reformatting it is assumed that a se- lected halftone frequency H will satisfactorily describe an entire document, and each of successive sets of N consecutive lines are concatenated to form respective single lines. The thus reformatted lines have a clearer halftone periodicity offering greater correlation and permit more efficient coding by well-known standard bilevel compression algorithms (e.g., CCITT G3 (MR) or G4 (MMR)). For an image with unknown pattern frequency, a technique for readily estimating the frequency for use in reformatting the image is described. Y0989-001

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