Method for halftoning a multi-channel digital color image

Details Method for halftoning a multi-channel digital color image Method for halftoning a multi-channel digital color image

1998-07-10

2000-07-18

Tran, Phuoc

Image analysis

Color image processing

358535, 358457, G06K 900

Patent

active

060918497

ABSTRACT:
A method for halftoning a multi-channel digital color image having an x,y array of color pixel values, includes the steps of: providing a matrix of dither values for each color channel of the digital color image wherein two or more of the matrices of dither values are designed jointly to minimize a visual cost function; for each color channel modularly addressing the matrix of dither values with the location of a pixel in the digital color image to obtain an addressed dither value; comparing the addressed dither value for each color channel with the pixel value for the corresponding color channel to determine an output halftone image value for each color channel; and repeating steps b and c for each pixel in the digital image.

REFERENCES:
patent: 4595948 (1986-06-01), Itoh et al.
patent: 5214517 (1993-05-01), Sullivan et al.
patent: 5291311 (1994-03-01), Miller
patent: 5469515 (1995-11-01), Lin
patent: 5822451 (1998-10-01), Spaulding et al.

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