Method and apparatus for rotation of high addressability bitmap

Details Method and apparatus for rotation of high addressability bitmap Method and apparatus for rotation of high addressability bitmap

1995-11-01

1997-05-27

Evans, Arthur G.

395117, G06K 1500

Patent

active

056340885

ABSTRACT:
The present invention is a method and apparatus for consistently rotating high addressability bitmap images to be rendered on a printing system. The invention first encodes the high addressability image to produce a regular bitmap array and then rotates the regular array. Next the invention applies a compact dot growth operation to assure that the exposure pulses for any gray pixels are consistently positioned, thereby assuring consistent output-independent of the rotation direction.

REFERENCES:
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patent: 4975977 (1990-12-01), Kurosa et al.
patent: 5012434 (1991-04-01), Ziethow et al.
patent: 5124692 (1992-06-01), Sasson
patent: 5359706 (1994-10-01), Sterling
patent: 5404411 (1995-04-01), Banton et al.
Xerox Disclosure Journal; "Fast Small-Angle Bitmap Rotation"; Michael J. Denbur; vol. 17, No. 5 Sep./Oct. 1992 391-392.

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