Bi-directional printing with overlap using both breaks and trans

Details Bi-directional printing with overlap using both breaks and trans Bi-directional printing with overlap using both breaks and trans

1998-09-08

2000-05-30

Coles, Edward L.

Facsimile and static presentation processing

Static presentation processing

Dot matrix array

358 11, 358 113, 347101, 347174, 347179, 400323, G06F 1500

Patent

active

060697091

ABSTRACT:
An apparatus for bi-directionally rendering an image includes a bi-directional printer (10) having an input (12) which receives data corresponding to the input image. A printhead (14), in accordance with the data, renders the image on a medium (M) in swaths as it passes horizontally over the medium (M) in opposing first and second directions. A medium advance device (16) advances the medium (M) vertically past the printhead (14) between horizontal passes of the printhead (14) in the first direction and horizontal passes of the printhead (14) in the second direction. Horizontal swaths of the image are segmented into a line of columns (20) such that the columns (20) are made up of vertical arrays of pixels. A detector circuit (18) detects for breaks (22) in each of the columns (20) of each swath. Transition regions are defined for columns (20) having no vertical breaks (22) therein. Rendered during the first printing pass are: (i) pixels which are above vertical breaks (22) in each column; (ii) pixels which are above transition regions in each column; and, (iii) a first portion of pixels located in each of the transition regions. Rendered on the reverse printing pass are: (i) pixels which are below vertical breaks (22) in each column; (ii) pixels which are below transition regions in each column; and, (iii) a second portion of pixels located in each of the transition regions.

REFERENCES:
patent: 5044796 (1991-09-01), Lund
patent: 5859958 (1999-01-01), Chan et al.

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