Dot matrix character printing using constrained memory

Details Dot matrix character printing using constrained memory Dot matrix character printing using constrained memory

1981-12-21

1984-07-03

Shaw, Gareth D.

Boots, shoes, and leggings

364519, 364523, 340728, 340748, 382 56, 400121, 400124, 400 70, G06F 314

Patent

active

044583338

ABSTRACT:
In a wire matrix printer control system, some characters from a finite alphabet are locally stored as compressed dot matrix objects reflectively symmetric about at least one axis. Upon being referenced and ascertained as a compressed object, the bits are applied to the printhead in column major order up to the axis of symmetry and then applied in reverse column major order. For uncompressed objects, the bits are applied only in column major order.

REFERENCES:
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patent: 3671957 (1972-06-01), Kegelman
patent: 4028731 (1977-06-01), Arps
patent: 4074254 (1978-02-01), Belser
patent: 4117470 (1978-09-01), Elliott
patent: 4146874 (1979-03-01), Ide et al.
patent: 4181973 (1980-01-01), Tseng
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patent: 4286329 (1981-08-01), Goertzel
Reghbati, "An Overview of Data Compression Techniques", IEEE Computers, Apr. 1981, pp. 71-75.
Casey et al., Fifth International Conference on Pattern Recognition, Miami, Florida, Dec. 1980, FIG. 3.

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