1. Associate Editor, IEEE Trans. Image Processing (July2007~).
2. Editor, IEEE Trans. Communications (1997~now).
3. Associate Editor, IEEE Trans. Multimedia (2002~now).
4. Editorial Board Member, International Journal of Image and Graphics World Scientific (2002~now).
5. Editorial Board Member, Journal of Visual Communication and Image Representation, Elsevier (2005~now).
6. Editorial Board Member, Research Letters in Signal Processing, Hindawi Publishing Corporation (2007~).

1. Singapore Chapter Chairman, IEEE Signal Processing Society (2000~2002).
2. Singapore MPEG Chairman and Head of Delegation (1997~2002). Leading Singapore to participate MPEG standardization meetings and related activities and duties.

1. Committee Member (elected), IEEE Signal Processing Society, Image and Multi-dimensional Digital Signal Processing (IMDSP) Technical Committee (2004~2010).
2. Committee Member (elected), IEEE Communications Society, Multimedia Communications Technical Committee (MMTC), since 2002.
3. Committee Member (elected), IEEE Circuits and Systems Society, Digital Signal Processing (DSP) Technical Committee, since 2006.
4. Technical Program Committee Member of multiple flagship international conferences: VCIP 2005; IEEE International Conference on Image Processing (2002); IEEE International Conference on Acoustics, Speech, and Signal Processing (2002~2003); IEEE International Conference on Multimedia and Expo; IEEE Multimedia Signal Processing Workshop (2002); The Second International Conference on Image and Graphics (2002); IEEE International Conference On Communications (2002~2004); Globalcom (2002~2004); and more ....
5. Founding member, Pattern Recognition and Machine Intelligence (PREMIA), Singapore Chapter.

1. Technical Program Co-Chair, International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS2007).
2. Technical Program Co-Chair, International Conference on Image Processing (ICIP'2004).
3. Member, Technical Committee, IEEE Workshop on Multimedia Signal Processing, St. Thomas US Virgin Islands, 9-11 December 2002.
4. Member, Technical Committee, IEEE International Conference on Image and Graphics, Heifei, China, 16-18 August 2002.
5. General Chair and Organization Chair of seven ISO/IEC JTC1/SC29 events, Singapore, 2-13 March 2001: SC29 Plenary, WG1 (JPEG/JBIG), WG11 (MPEG), WG12 (MHEG), MPEG-4 Industry Forum (M4IF), International JPEG2000 Seminar, and MPEG-7 Awareness Event. (About 600 delegates attended.)
6. Organizing Member, organization committee of ISO/IEC JTC1/SC29/WG11 (MPEG) standardization meeting, Singapore, 7-11 November 1994 (about 250 delegates participated)
7. General Chair, Singapore MPEG National Seminar, June 1998.
8. Poster-Session Chair, Asian Conf. on Computer Vision (ACCV'95), Singapore.
9. Session Co-Chair, IEEE Geoscience and Remote Sensing Society (IGARSS'97), Singapore.
10. Member, Organizing Committee, Int'l Conf. on Info., Commun. and Signal Proc., (ICICS'97, '99, '01), Singapore.

1. MPEG-7 proposals.
2. Proceedings of the IEEE.
3. IEEE Trans. Image Processing.
4. IEEE Trans. Signal Processing.
5. IEEE Trans. Circuits and Systems for Video Technology.
6. IEEE Trans. Communications.
7. IEEE Trans. Multimedia.
8. IEEE Trans. Fuzzy Systems.
9. IEEE Trans. Very Large Scale Integration Systems
10. IEEE Signal Processing Letters.
11. IEEE Communications Letters.
12. IEEE Multimedia Magazine.
13. International Journal on Signal, Image and Video Processing (Springer-Verlag)
14. EURASIP Signal Processing.
15. EURASIP Signal Processing: Image Communication.
16. Optical Engineering.
17. Journal of Mathematical Imaging and Vision (Kluwer Academic Publishers)
18. Journal of Visual Communication and Image Representation.
19. Pattern Recognition Letters.
20. IEICE Transactions.
21. International conferences: ICASSP, ICIP, ICME, ISCAS, MMSP, VCIP, etc.