Dithering device

Details Dithering device Dithering device

1998-08-25

2000-10-17

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358456, 358460, 358466, 358534, 382270, 382237, H04N 1405, H04N 152

Patent

active

061340243

ABSTRACT:
A dithering device converts a multi-gradation image into a binary image by comparing, in sequence, values of pixels forming the multi-gradation image with threshold values of corresponding elements forming a dither matrix. For determining the element corresponding to the pixel, the dithering device uses an array representing a relationship between a first group of positions of the elements to be used currently and a second group of positions of the elements to be used next. By referring to the array, the dithering device determines the position of the element from the second group based on the position of the element in the first group so as to compare the next pixel with the threshold value of the determined element.

REFERENCES:
patent: 5166809 (1992-11-01), Surbrook et al.
patent: 5495346 (1996-02-01), Choi et al.
patent: 5953459 (1999-09-01), Ueda et al.

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