HALFTONING AND WATERMARKING

AM/FM halftoning: digital halftoning through simultaneous modulation of dot size and dot density

[+] Author Affiliations
Zhen He, Charles A. Bouman

Purdue University, School of Electrical and Computer Engineering, West Lafayette, Indiana 47907-1285

J. Electron. Imaging. 13(2), 286-302 (Apr 01, 2004). doi:10.1117/1.1669555
History: Received Feb. 11, 2002; Revised Mar. 17, 2003; Revised Oct. 23, 2003; Accepted Oct. 23, 2003; Online April 01, 2004
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Conventional digital halftoning approaches function by modulating either the dot size [amplitude modulation (AM)] or the dot density [frequency modulation (FM)]. Generally, AM halftoning methods have the advantage of low computation and good print stability, while FM halftoning methods typically have higher spatial resolution and resistance to moire´ artifacts. In this paper, we present a new class of AM/FM halftoning algorithms that simultaneously modulate the dot size and density. The major advantages of AM/FM halftoning are better stability than FM methods through the formation of larger dot clusters; better moire´ resistance than AM methods through irregular dot placement; and improved quality through systematic optimization of the dot size and dot density at each gray level. We present a general method for optimizing the AM/FM method for specific printers, and we apply this method to an electrophotographic printer using pulse width modulation technology. © 2004 SPIE and IS&T.

© 2004 SPIE and IS&T

Citation

Zhen He and Charles A. Bouman
"AM/FM halftoning: digital halftoning through simultaneous modulation of dot size and dot density", J. Electron. Imaging. 13(2), 286-302 (Apr 01, 2004). ; http://dx.doi.org/10.1117/1.1669555


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