Method for compressing and decompressing font data

Details Method for compressing and decompressing font data Method for compressing and decompressing font data

1993-09-29

2000-05-30

Evans, Arthur G.

395115, G06K 1500

Patent

active

06069999&

ABSTRACT:
A novel font compression method is disclosed that incorporates a plurality of data encoding techniques for compressing bit map font data or the like. Such individual characters of a font are represented in blocks comprised of a plurality of lines of data. The font data is first encoded according to encoding techniques that are applicable to the blocks of character data. Subsequently, each line of data is further encoded according to one of several selected encoding techniques. A selection of which technique to use for encoding a particular line is made by determining the length of data that will result from encoding using each of the selected techniques and comparing the lengths to select the technique yielding the shortest encoded data length. A novel Group encoding method is disclosed having particular application to bit strings of data having several groups of identical data bits. According to Group encoding each group is encoded by providing a first encoded portion including unit encoding bits and a second encoding portion including a binary representation of the remainder bits after subtracting the number encoded by the unit encoding bits. A font cartridge apparatus manufactured in accordance with the present invention is disclosed.

REFERENCES:
patent: 4555802 (1985-11-01), Fedak et al.
patent: 5046027 (1991-09-01), Taaffe et al.
IBM Technical Disclosure Bulletin vol. 8, Jan. 1986 No. 8 "Compression/Decompression of Fon-7-Pattern".

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