June 1995
Intermediate to advanced
438 pages
10h 53m
English
Content preview from Graphics Gems V (IBM Version)
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VI.1
Improved Threshold Matrices for Ordered Dithering
Purgathofer Werner, Technical University of Vienna Vienna, Austria
F. Tobler Robert, Technical University of Vienna Vienna, Austria
Geiler Manfred, Technical University of Vienna Vienna, Austria
This gem presents an improved halftoning technique using dispersed dots. 1 This corresponds to finding a microdot distribution that approximates the intensity levels that have to be rendered. An improved threshold matrix for ordered dithering is presented that avoids unwanted low-frequency portions without introducing too much random noise. Since the new method produces images of high quality, it is ideally suited for output generation in high-end image processing systems.