B.Sc.(CUHK), M.Sc., Ph.D.(Loughborough), CEng., MHKIE, SrMIEEE
Email: wkcham@ee.cuhk.edu.hk
Telephone: +852 3943-8281 Fax: +852 2603-5558
Wai-kuen Cham graduated from The Chinese University of Hong Kong in 1979 in Electronics. He received his M.Sc. and Ph.D. degrees from Loughborough University of Technology, U.K., in 1980 and 1983 respectively. His research work was on image coding and in close collaboration with British Telecom. From June 1984 to April 1985, he was a senior engineer in Datacraft Hong Kong Limited and a lecturer in the Department of Electronic Engineering, Hong Kong Polytechnic (now The Polytechnic University of Hong Kong). Since May 1985, he has been with the Department of Electronic Engineering, the Chinese University of Hong Kong.
Prof. Cham's research interests are image and video signal processing. He has published over hundred papers in international journals and proceedings of major conferences and is the inventor of a number of patents. Prof. Cham has acted as a consultant to a number of government and industrial organizations, such as the Hong Kong Consumer Council, Grace Everett Ltd, COMedia HK Ltd and Jet Propulsion Laboratory, NASA. He is the inventor of the Integer Cosine Transform which was used in the NASA Galileo space mission and is adopted in the international video coding standard H.264/AVC, VC-1 and the national standard of China AVS (Audio Video Coding Standard). Prof. Cham is a Chartered Engineer, a senior member of IEEE and was an associate editor of IEEE Trans. Image Processing from 2010 to 2014.
Digital Signal Processing, Image/Video Coding, Image Processing, Pattern Matching, Edge-model-based Image Processing
Recipient of The Exemplary Teaching Award 2000 of the Engineering Faculty
Subjects taught in 2013/2014
Member of International Program Committee for International Conference on Signal Processing and Multimedia Applications, (SIGMAP), Reykjavik, Iceland, July 29-31, 2013.
Member of the International Program Committee, International Conference on Signal Processing, Pattern Recognition and Applications (SPPRA), Innsbruck, Austria, February 12-14, 2013.
Technical Program Chair, 2010 International Conference on Image Processing (ICIP2010), Hong Kong, 12-15 December 2010.
Voting Member, IEEE Multimedia Communications Technical Committee (MMTC), since January 2009.
Associate Editor, IEEE Trans. Image Processing, since December 2010.
Journal (names underlined are W.K. Cham's current or former students.)
Cham,W.K., 'Development of Integer Cosine Transforms by the Principle of Dyadic Symmetry,'*1 IEE Proceedings Part I, Vol.136, No.4, August 1989, pp.276-282.
Cham,W.K., Chan,Y.T., 'An Order-16 Integer Cosine Transform,'*2 IEEE Trans. on Signal Processing, Vol.39, No.5, May 1991, pp.1205- 1208.
Fan,G.L., Cham,W.K., 'Model-based edge reconstruction for low bit-rate wavelet compressed images,'*3 IEEE Trans. CAS VT, Vol.10, No.1, February 2000, pp.120-132.
Fan,G.L, Cham, W.K. 'Postprocessing of Low Bit-rate Wavelet-based Image Coding using Multiscale Edge Characterization,' *4 IEEE Trans. CAS VT, Vol.11, No. 12, December, 2001, pp.1263-1272.
Sun, D.Q., Cham, W.K., 'An Effective Postprocessing Method for Low Bit Rate Block DCT Coded Images,' *5 IEEE Trans. Image Processing, Vol.16, No.11, November 2007, pp.2743-2751. (MATLAB code of the proposed method)
Zhang, Ci-Xun, Yu, L., Lou, J., Cham, W.K., Dong J.,'The Technique of Pre-scaled Integer Transform: Concept, Design and Applications,' IEEE Trans. CASVT, Vol.18, No.1, January 2008, pp.84-97.
Mak, C.M., Fong, C.K., Cham, W.K., 'Fast Motion Estimation for H.264/AVC in Walsh Hadamard Domain,' IEEE Trans. CASVT, Vol.18, No.6, June 2008, pp.735-745.
Dong, J., Ngan, K.N., Fong, C.K., Cham, W.K. , '2D Order-16 Integer Transforms for HD Video Coding,' IEEE Trans. CASVT, Vol.19, No.10, October 2009, pp.1463-1474.
Ouyang, W., Cham, W.K., ' Fast Algorithm for Walsh Hadamard Transform on Sliding Windows,' IEEE Trans. PAMI, Vol.32, No.1, January 2010, pp.165-171. (MATLAB code of the proposed fast algorithm)
Zhao, C., Wang, X., Cham, W.K., ' Background Subtraction via Robust Dictionary Learning,' EURASIP Journal on Image and Video Processing, Vol.2011, Article ID 972961, 2011, pp.1-12.
Zhang, R., Ouyang, W., Cham, W.K., ' Image Postprocessing by Non-local Kuan’s Filter,' Journal of Visual Communication and Image Representation, Vol. 22, Issue 3, April 2011, pp.251-262.
Zhang, W., Cham, W.K., 'Hallucinating Face in the DCT Domain,' IEEE Trans. Image Processing, Vol.20, No.10, October 2011, pp.2769-2779.
Tombari, F., Ouyang, W., Di Stefano, L., Cham, W.K., 'Adaptive Low Resolution Pruning for Fast Full Search Equivalent Pattern Matching,' Pattern Recognition Letters, Vol.32, Issue 15, November 2011, pp.2119-2127.
Ouyang, W., Tombari, F., Mattoccia, S., Stefano, L.D., Cham, W.K., ' Performance Evaluation of Full Search Equivalent Pattern Matching Algorithms,' IEEE Trans. PAMI, Vol.34, Issue 1, Jan 2012, pp.127-143.
Zhang, W., Cham, W.K., ' Single Image Refocusing and Defocusing,' IEEE Trans. Image Processing, Vol.21, No.2, February 2012, pp.873-882.
Zhang, W., Cham, W.K., ' Gradient-directed Multi-exposure Composition,' IEEE Trans. Image Processing, Vol.21, No.4, April 2012, pp.2318-2323.
Fong, C.K., Cham, W.K., ' LLM Integer Cosine Transform and its Fast Algorithm,' IEEE Trans. CASVT, Vol. 22, No.6, June 2012, pp. 844-854.
Ouyang, W., Zhang, R., Cham, W.K., ' The Segmented Gray-Code Kernels for Fast Pattern Matching,' IEEE Trans. Image Processing, Vol.22, No.4, April 2013, pp.1512-25.
Note:
*1. © 1989 IET. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IET.
*2. © 1991 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IEEE.
*3. © 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IEEE.
*4. © 2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IEEE.
*5. © 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IEEE.
Conference
Ouyang, Wanli, Cham, W.K., ' Fast pattern matching using orthogonal Haar transform,' Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), San Francisco, USA, June 15-17, 2010, pp.3050-3057.
Fong, C.K., Cham, W.K., ' Simple Order-16 Integer Transform for Video Coding,' Proceedings of the 2010 International Conference on Image Processing (ICIP), Hong Kong, Sept 26-29, 2010, pp.161-164.
Zhang, W., Cham, W.K., ' High Quality Artifact-free Super-resolution,' Proceedings of the 2010 International Conference on Image Processing (ICIP), Hong Kong, Sept 26-29, 2010, pp.889-892.
Zhao, C., Cham, W.K., ' Joint Face Alignment with A Generic Deformable Face Model,' Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), Colorado Springs, USA, June 20-25, 2011, pp.561-568.
Zhang, Renqi, Liu, Y., Cham, W.K., ' High Performance Deartifacting Filters in Video Compression,' Proceedings of 2011 International Conference on Acoustics, Speech and Signal Processing (ICASSP), Prague, Czech Republic, May 22-27, 2011, pp.1069-1072.
Contributions to standards
[AVS_M2610] W.K. Cham, C.K. Fong, Y.L. Fong, K.N. Ngan, Y. Liu, K.M. Cheng, Adaptive Block-size Transform towards AVS 2.0, 30th AVS meeting, Wuxi, Sept 2009.
[AVS_M2647] W.K. Cham, C.K. Fong, Y. Liu, K.M. Cheng, Adaptive Block-size Transform towards AVS 2.0, 31st AVS meeting, Beijing, Dec 2009.
[AVS_M2657] W.K. Cham, C.K. Fong, Y. Liu, K.M. Cheng, An investigation of Order-16 Transform in AVS-M2606 ABT, 31st AVS meeting, Beijing, Dec 2009.
[AVS_M2666] C.K. Fong, W.K. Cham, Y. Liu, K.M. Cheng, Adaptive Block-size Transform towards AVS 2.0, 32nd AVS meeting, Guangzhou, Mar 2010.
[AVS_M2911] W.K. Cham, C.K. Fong, Qinglong Han, A New Orthogonal Order-16 Transform for ABT, 40th AVS meeting, Beijing, Mar 2012.
[AVS_M2985] C.K. Fong, W.K. Cham, Qinglong Han, Recursive Integer Cosine Transform in AVS2, 43rd AVS meeting, Beijing, Dec 2012.
[AVS_M3034] C.K. Fong, Qinglong Han, W.K. Cham, Recursive Integer Cosine Transform in AVS2, 44th AVS meeting, Luoyang, Mar 2013.
[AVS_M3084] C.K. Fong, W.K. Cham, Qinglong Han, Recursive Integer Cosine Transform in AVS2, 45th AVS meeting, Taicang, Jun 2013.
[AVS_M3176] Z. Chen, Qinglong Han, C.K. Fong, W.K. Cham, Recursive Integer Cosine Transform in AVS2, 46th AVS meeting, Shenyang, Sept 2013.
Cham, W.K., Fong, C.K., '离散余弦变换信号与整数余弦变换信号间的信号转换方法 Signal conversion method between signal of discrete cosine transform and signal of integral cosine transformation', China Patent Office Patent No. ZL 2004 1 0071003.0, May 28, 2008.
Yu, L., Cham, W.K., Lou, J., '图象和视频信号变换装置及其方法', China Patent Office Patent No. ZL 2004 1 0015637.4 , April 28, 2010 (The work was accepted as a part of the Audio Visual Coding Standard AVS).
CHAM, W.K., FONG C.K., DONG J., NGAN, K.N., WONG, H.M., WANG, L., HUO, Y., PUN, H.Y., 'Method and Device for Order-16 Integer Transform from Order-8 Integer Cosine Transform', US Patent Number: 8228983 B2, July 24, 2012.
Cham, W.K., Fong, C.K., 'Processes and Apparatus for Deriving Order-16 Integer Transforms', US Patent Number: 8,255,445 B2, Aug. 28, 2012.
Cham, W.K., Fong, C.K., 'Methods and Apparatus for deriving an order-16 Integer Transform', US Patent Number: 8,175,165 B2, May 8, 2012.
Cham, W.K., 'Generation of an order-2N Transform from an Order-N Transform', US Patent number: 8,102,918 B2, January 24, 2012.
Zhang, W., Cham, W.K., '用于编辑图像的方法和装置 Image Focus Editing', China Patent Office Patent No. ZL 2010 8 0003117.5, May 29, 2013.
Ph.D Program:
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