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Gray-level disturbance in pulse number modulation and its reduction algorithm

[+] Author Affiliations
Chang-Su Kim

Korea University, School of Electrical Engineering, Seoul 136-713, Korea

Rin-Chul Kim

University of Seoul, Department of Electrical Engineering, Seoul 130-743, Korea

J. Electron. Imaging. 15(4), 043002 (October 24, 2006). doi:10.1117/1.2360691
History: Received March 15, 2006; Revised July 10, 2006; Accepted July 31, 2006; Published October 24, 2006
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An effective algorithm to reduce gray-level disturbance (GLD) in pulse number modulation is proposed. GLD occurs when moving image sequences are presented by plasma display panels (PDPs) or digital micromirror devices (DMDs), which use pulse number modulation to express gray levels. We first develop a systematic model for GLD, and then show that GLD can be eliminated if the light emission pattern of every gray level has the same shape. Based on the ideal condition, we design subfield and driving vectors. The lexicographically largest vector is employed as the subfield vector, since it can flexibly control the shapes of light emission patterns. Then, three methods are proposed to determine driving vectors: the zero-order, first-order, and tree methods. The zero-order method has the lowest implementation complexity, whereas the tree method reduces GLD most effectively. The first-order method offers a good tradeoff between implementation complexity and disturbance reduction capability. Simulation results demonstrate that these methods suppress GLD effectively and provide good moving image quality.

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© 2006 SPIE and IS&T

Topics

Modulation

Citation

Chang-Su Kim and Rin-Chul Kim
"Gray-level disturbance in pulse number modulation and its reduction algorithm", J. Electron. Imaging. 15(4), 043002 (October 24, 2006). ; http://dx.doi.org/10.1117/1.2360691


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