Methods of compression and expansion of dot pattern

Details Methods of compression and expansion of dot pattern Methods of compression and expansion of dot pattern

1991-03-22

1993-05-04

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

395110, 395114, 340728, B44J 2485

Patent

active

052075176

ABSTRACT:
In a method of compression of a dot pattern which is arranged in such a manner that two or more printing dots are not adjacent in a main scanning direction, the pattern is compressed and stored in a memory, while data read out from the memory is subjected to an expansion processing to obtain the original dot pattern, so that when a printing is performed, dummy printing dots are inserted into rows of the printing dots arranged in the main scanning direction in such a manner that columns of the printing dots arranged in a subscanning direction perpendicular to the main scanning direction. The dot pattern is compressed based on the columns of the printing dots and associated information indicating repetition of the disposition, and then stored in the memory. Further in accordance with the method as stated above, a dot pattern including dummy printing dots is prepared based on the columns of the printing dots which are read out from the memory and arranged in the subscanning direction, and associated information indicating repetition of the disposition of the columns of the printing dots in the main scanning direction. Part of the printing dots is deleted if so arranged that two or more printing dots including the dummy printing dots are adjacent in the main scanning direction, so that the dot pattern is restored in such a manner that two or more printing dots are not adjacent in the main scanning direction.

REFERENCES:
patent: 4632579 (1986-12-01), Takano et al.
patent: 4741635 (1988-05-01), Shibata
patent: 4881069 (1989-11-01), Kameda et al.
patent: 4942390 (1990-07-01), Do et al.
IBM TDB; "Compression/Decompression of Font Patterns"; vol. 28, No. 8, pp. 3563-3564; Jan. 1986.

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