Method and apparatus for thinning printed images

Details Method and apparatus for thinning printed images Method and apparatus for thinning printed images

H - Electricity

04

N

H04N 1/23 (2006.01) G09G 5/20 (2006.01) G09G 5/395 (2006.01) H04N 1/40 (2006.01) H04N 1/409 (2006.01)

Patent

CA 2049596

A method and apparatus are shown for improving bit- image quality in video display terminals and xerographic processors. In one embodiment, each scan line of a source image is ANDed with the scan line above to remove half-bits and thin halftones. In other embodiments, entire blocks of data are processed by bit-block transfer operations, such as ANDing a copy of the source image with a copy of itself shifted by one bit. Also, a source image can be compared to a shifted copy of itself to locate diagonal lines in order to place gray pixels near these lines.

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