CACS FACULTY AND THEIR RESEARCH INTERESTS

Dr. CHEE-HUNG HENRY CHU

Associate Professor of Computer Engineering. B.S.E. summa cum laude, Computer Eng., Univ. Michigan, Ann Arbor, 1981; M.S.E., Computer, Information and Control Eng., Univ. Michigan, Ann Arbor, 1982; Ph.D., Electrical Eng., Purdue Univ., West Lafayette, Indiana, 1988.

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Recent work of Dr. Chu and his students in image processing includes watermarking and halftoning of color image. In image watermarking, a multiresolution method was devised so that the watermark could be embedded to minimize perceptual distortion and to maximize its robustness against tampering. In color halftoning, a method was designed for halftoning using an arbitrary palette. Compared to the only known algorithm, viz. error diffusion, the new method produced no color shift and fewer color spikes.

A medical imaging data fusion method was developed for neuroscientific visualization. The cortical potential field as reconstructed from scalp-recorded electroencephalographic data is rendered on the cortical surface derived from magnetic resonance imaging data. Current work includes the assessment as well as the visualization of the effects of volume data compression on surface reconstruction. Another ongoing work is in the development of algorithms for imaging scenes with large dynamic ranges of illumination.

PROFESSIONAL ACTIVITIES

Dr. Chu is a Registered Professional Engineer in Electrical Engineering. He is a member of the Institute of Electrical and Electronics Engineers and the Association for Computing Machinery, and the honor societies of Tau Beta Pi, Eta Kappa Nu, and Phi Kappa Phi. He is currently the vice president of the university's chapter of the Phi Kappa Phi honor society. In May 2000, he received the university foundation's Distinguished Professor Award.

SELECTED PUBLICATIONS

S. Thainimit and C. H. Chu, "Illumination mipmaps for texture mapping in digital video," presented at IEEE Int. Workshop on Digital and Computational Video, Clearwater, Fla., Nov. 2002.
W. Wettayaprasit, C. Lursinsap, and C. H. Chu, "Quasi-morphism and comprehensibility of rules in inductive learning," in Proc. IEEE International Conference on Cognitive Informatics, Calgary, Canada, August 2002.
S. Noel, C. H. Chu, V. V. Raghavan, "Visualization of document co-citations," in Proc. 6th International Conference on Information Visualization, London, U.K., July 2002.
N. Breaux and C. H. Chu, "Halftoning for color-indexed displays," in Proc. 1999 IEEE International Conference on Image Processing, Kobe, Japan, October 1999, Vol. 3, pp. 597-601.
M. C. Erie, C. H. Chu, and R. D. Sidman, "Visualization of the cortical potential field by medical imaging data fusion," in Proc. Third International Conference on Visual Information Systems, Amsterdam, the Netherlands, June 1999, pp. 809-816.
C. H. Chu and A. W. Wiltz, "Luminance channel modulated watermarking of digital images," in Proc. SPIE Wavelet Applications Conference, Orlando, Fla., April 1999, pp. 437-445.
W. Watunyuta and C. H. Chu, "Voronoi tessellation-based spatial domain analysis of digital halftoning methods," Optics Communications, vol. 140, pp. 110-118, 1997.