Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1994-11-14
1996-05-14
Bennett, Christopher A.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
395108, B41J 222
Patent
active
055162169
ABSTRACT:
A method and apparatus for enhancing the quality of images printed by dot printers or dot displays are disclosed. Image irregularities caused by quantization are smoothed by using a set of rules to transform an initial pattern into an enhanced pattern for printing. The initial pattern may consist of a matrix of bits representing an image having X dots per inch along an intended direction of printing. An intermediate pattern is formed by replicating columns of bits from the initial pattern. Image enhancement rules are applied to the intermediate pattern to invert one or more bits in the intermediate pattern to create an enhanced pattern. The enhanced pattern is printed at n*X dots per inch along the direction of printing where n.gtoreq.1.
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IBM Technical Disclosure Bulletin vol. 25 No. 10 Mar. 1983.
Blume J. Erik
McDonough Timothy M.
Scandalis Aneesa R.
Bennett Christopher A.
Hewlett--Packard Company
Kelley Steven S.
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