The mission of the Communication and Collaboration Systems (CCS) research group is to advance the state-of-the-art in the areas of communication and collaboration systems.  The CCS group achieves its mission by conducting work in the following two overlapping areas:

Communication Systems: information coding and communication of media signals and computer data over packet networks, in various forms, including real-time communication of voice and video, streaming media on demand, live broadcast of media and game data, file sharing and reliable content distribution, and data gathering from distributed information sources, all over existing, emerging, and novel network configurations.

Multimedia Collaboration: technologies and applications for enabling people to reach each other easily, even when separated by space and/or time, including systems for audio and video conferencing; application and data sharing; meeting and lecture recording; and so forth, in both real time and asynchronous scenarios, as well as person-to-person, person-to-group, and group-to-group settings.

Primary Contact: Philip A. Chou
Chou, Philip A.	Florencio, Dinei	He, Li-wei	Hegde, Rajesh
Huang, Cheng	Jain, Manish	Li, Jin	Liu, Zicheng
Photo Not Available Liu, Mingyan	Photo Not Available Mehrotra, Sanjeev	Sengupta, Sudipta	Wu, Yunnan
Zhang, Zhengyou	Zhang, Cha
Affiliate Members
Acero, Alex	Burges, Chris J.C.	Jacobs, Andy	Malvar, Rico
Regan, Tim

• Manish Jain (Georgia Tech), 2008-9
• Minguan Cheng (Berkeley, now at CUHK), 2006-7

• Ruigang Yang (Kentucky), 2008
• Mingyan Liu (Michigan), 2008
• Wangqing Li (Wolongong), 2008
• Wayne Stark (Michigan), 2006
• Baochun Li (Toronto), 2006
• Geoffrey Chan (Queen's), 2006
• Max Costa (Unicamp), 2006

• John Weng (Michigan State), 2008
• Yi Cui (Vanderbilt), 2008
• Ming-Ting Sun (Washington), 2008
• Reza Rejaie (Oregon), 2008
• Mung Chiang (Princeton), 2008
• Baochun Li (Toronto), 2007
• Lihao Xu (Wayne State), 2007
• Kannan Ramchandran (Berkeley), 2007
• Keith Ross (Polytechnic), 2007
• Aaron Bobick (Georgia Tech), 2006
• Keith Ross (Polytechnic), 2006
• Prasun Dewan (North Carolina), 2006
• Michelle Effros (Caltech), 2004
• Kannan Ramchandran (Berkeley), 2005

• Minxuan Sun (Georgia Tech), 2008
• Qing Zhang (Kentucky), 2008
• Shao Liu (Princeton), 2007-8

• Pascal Fua (EPFL), 2008
• Erran Li (Bell Labs), 2008
• Ashish Khisti (MIT), 2008
• Carlo Busso (USC), 2008
• Zhihong Zeng (UIUC), 2008
• Marina L. Gavrilova (Univ. of Calgary), 2007
• Biao Chen (Syracuse Univ) 2007
• Reza Rejaie (Oregon), 2007
• Juyang (John) Weng (Michigan State), 2007
• Alessandro Abate (Berkeley), 2007
• Thinh Nguyen (Oregon State), 2007
• Ruigang Yang (Kentucky), 2007
• Hai Tao (UC Santa Cruz), 2007
• Steve Levinson (UIUC), 2006
• Xinghua Zhuang (Missouri), 2006
• Demetri Terzopoulos (UCLA), 2006
• Cordelia Schmid (INRIA), 2006
• Aude Oliver (MIT), 2006
• Michael Mitzenmacher (Harvard), 2006
• Joerg Kliewer (Kiel), 2006
• Mohamed Najim (Bordeaux), 2005
• Jay Kuo (USC), 2005
• Raymond Yeung (CUHK), 2004

• 2008
  • Amit Mondal (Northwestern)
  • Angela Wang (Poly/NYU)
  • Ashish Vulimiri (IIT Kharagpur)
  • Aswin Sankaranarayanan (Maryland)
  • Engin Tola (EPFL)
  • Mehrez Souden (Université du Quebec)
  • Sasa Junuzovic (UNC Chapel Hill)
  • Sayandeep Sen (Wisconsin)
  • Vijay Vasudevon (CMU)
  • Xiaogang Wang (MIT)
  • Ying-zong Huang (MIT)
• 2007
  • Aayush Sharma (IIT Roorkee)
  • Alex Dimakis (Berkeley)
  • Amitanand Aiyer (UT Austin)
  • Fahad Dogar (CMU)
  • Jacek Dmochowski (Université du Québec)
  • June Wang (Berkeley)
  • Liao Miao (Kentucky)
  • Mingxuan Sun (Georgia Tech)
  • Miroslav Ponec (Polytechnic)
  • Qi Zhao (UC Santa Cruz)
  • Raffay Hamid (Georgia Tech)
  • Sasa Junuzovic (UNC Chapel Hill)
  • Yuan Yuan (Maryland)
• 2006
• Amar Subramanian (UW)
• Demba Ba (MIT)
• Jian Liang (Polytechnic)
• Junlin Li (Georgia Tech)
• Nick Harvey (MIT)
• Rongmei Zhang (Purdue)
• Sang Min Oh (Georgia Tech)
• Sasa Junuzovic (UNC Chapel Hill)
• Saumitra Das (Purdue)
• Yang Wang (SUNY Stony Brook)
• Yuan Yuan (Maryland)
• 2005
• Alberto Lopez Toledo (Columbia)
• Arlindo Flávio da Conceição (São Paulo)
• Bin Yu (UIUC)
• Dinesh Garg (IIS Bangalore)
• Jue Wang (UW)
• Pei Yin (Georgia Tech)
• Qiang Huang (Princeton)
• Sasa Junuzovic (UNC Chapel Hill)
• Shobit Saxena (IIT Delhi)
• Ting Yu (Northwestern)
• Jason Xu (UIUC)
• Yong Sun (Texas A&M)
• 2004
• Aditya Ramamoorthy (UCLA)
• Ashwin Bharambe (CMU)
• Bin Yu (UIUC)
• Jue Wang (UW)
• Sachin Agarwal (BU)
• Yi Cui (UIUC)

* For corrections or post-2004 additions to the above lists, please send email to Phil Chou.

Here is a sample of our recent projects.

• Content distribution using market mechanisms and utility maximization.
• Peer-assisted streaming media on demand.
• Delay reduction in multipoint VoIP conferences.
• Anti-phishing technology based on password reuse.
• Collaborative platform for developers.
• Network coding over wireless networks.
• Audio healer for error concealment and delay reduction in voice over IP
• Optimal Rate Control for glitch-free, low-delay streaming media
• Rate Distortion Optimized streaming media
• Hybrid FEC and Pseudo-ARQ for robust media multicast
• Multiple Description Coding for robust media multicast
• Cooperative Networking for peer-assisted (application level) multicast
• Practical Network Coding for high performance, low management multicast
• VMedia for browsing virtual environments over the Internet
• Embedded Audio, Video, and Image Coding for scalable audio distribution
• Progressive to Lossless coding using reversible transforms based on lifting
• Distributed Peer Streaming and Web Hosting in a peer-to-peer network
• Mutualcast for reliable simultaneous multicast to small groups
• Video content downloading
• Automated Lecture Rooms (iCam)
• RingCam Meeting Recording System
• Real-time Room Conferencing Using RingCam
• Live Whiteboard Capture
• Audio Time-Scale Modification (Time Compression)
• Real-time Multi-Person Tracking
• Robust Microphone Array Sound Source Localization
• Speaker Tracking Using Particle Filter Sensor Fusion
• Virtual Director
• Low Bit-rate Talking head
• Human-Phone Discrimination for Multi-Party Conferencing

Here is a sample of our recent publications. Please see the author's individual web pages for complete listings and electronic versions.

• M. Médard, R. Koetter, and P. A. Chou, Network Coding: A New Network Design Paradigm, half-day tutorial, IEEE International Symposium on Information Theory, Adelaide, September 2005.
• K. Jain, L. Lovász, and P. A. Chou, Building scalable and robust peer-to-peer overlay networks for broadcasting using network coding, ACM Symposium on Principles of Distributed Computing, Las Vegas, NV, July 2005. Also to appear in Journal of Distributed Computing.
• J. Li, P. A. Chou, and C. Zhang, Mutualcast: An efficient mechanism for one-to-many content distribution, ACM SIGCOMM ASIA Workshop, April 2005.
• C. Huang, P. A. Chou, and A. Klemets, Optimal control of multiple bit rates for streaming media, Picture Coding Symposium, San Francisco, CA, December 2004.
• A. Ramamoorthy, K. Jain, P. A. Chou, and M. Effros, Separating distributed source coding from network coding, Allerton Conference on Communication, Control, and Computing, Monticello, IL, October 2004. Invited paper.
• Y. Wu, P. A. Chou, Q. Zhang, K. Jain, W. Zhu, and S.-Y. Kung, Network planning in wireless ad hoc networks: a cross-layer approach, IEEE J. Selected Areas on Communications (Special Issue on Wireless Ad hoc Networks), January 2005.
• Yong Rui, Anoop Gupta, Jonathan Grudin and Li-wei He, Automating lecture capture and broadcast: technology and videography, ACM Multimedia Systems Journal (Springer), 10:3-15 (2004)
• Yong Rui and Zicheng Liu, ARTiFACIAL: Automated Reverse Turing test using FACIAL features, ACM Multimedia Systems Journal (Springer), May 2004
• Yunqiang Chen and Yong Rui, Real-time Speaker Tracking Using Particle Filter Sensor Fusion, Proceedings of the IEEE, vol. 92, no. 3, pp. 485-494, March 2004.
• V. N. Padmanabhan, H. J. Wang, and P. A. Chou, Resilient peer-to-peer streaming, IEEE Int'l Conf. Network Protocols, Atlanta, November 2003.
• A. György, T. Linder, P. A. Chou, and B. J. Betts, Do optimal entropy-constrained quantizers have a finite or infinite number of codewords? IEEE Trans. Information Theory, November 2003.
• P. A. Chou, Y. Wu, and K. Jain, Practical network coding, Allerton Conf. Communication, Control, and Computing, October 2003.  Invited paper.
• Xiang Sean Zhou, Yong Rui and Thomas Huang, Exploration of Visual Data, Kluwer Academic Publishers, Boston Hardbound, ISBN 1-4020-7569-3 August 2003, 208 pp.
• Yong Rui and Dinei Florencio, New direct approaches to robust sound source localization, Proc. IEEE Int'l Conf. Multimedia and Expo, Baltimore, July 2003.
• J. Ribas-Corbera, P. A. Chou, and S. Regunathan, A generalized hypothetical reference decoder for H.264/AVC, IEEE Trans. Circuits and Systems for Video Technology, July 2003.
• S. Jaggi, P. Sanders, P. A. Chou, M. Effros, S. Egner, K. Jain, and L. Tolhuizen, Polynomial time algorithms for multicast network code construction, IEEE Trans. Information Theory.  In review.
• H. S. Malvar and D. A. F. Florêncio, Improved spread spectrum: a new modulation technique for robust watermarking, IEEE Trans. Signal Processing, vol. 51, pp. 898905, April 2003.
• Y. Chen, Y. Rui, and T. Huang, Parametric contour tracking using unscented Kalman filter, Proc. IEEE Int'l Conf. Image Processing, Rochester, September 2002.
• A. Sehgal and P. A. Chou, Cost-distortion optimized streaming media over DiffServ networks, IEEE Int'l Conf. Multimedia and Expo, Lausanne, August 2002. Best Paper Award.
• A. Klein, T. Grant, A. Finkelstein, and Michael F. Cohen, Video mosaics, Proc. NPAR, June 2002.
• Z. Liu, Z. Zhang, C. Jacobs, and M. Cohen, Rapid modeling of animated faces from video, J. Visualization and Computer Animation, 2001.
• Y. Rui and Y. Chen, Better proposed distributions: object tracking using unscented particle filter, Proc. CVPR, 2001.
• Y. Chen, Y. Rui, and T. S. Huang, JPDAF-based HMM for real-time contour tracking, Proc. CVPR, 2001.  Outstanding student paper award.
• Y. Rui, L.-w. He, A. Gupta and Q. Liu, Building an intelligent camera management system, Proc. ACM Multimedia, Ottawa, September 2001.
• L. Luo, J. Li, S. Li, Z. Zhuang and Y. Zhang, Motion compensated lifting wavelet and its application in video coding, Proc. IEEE Int'l Conf. Multimedia and Expo, Tokyo, August 2001.
• B. W. Gillespie, D. A. F. Florêncio, and H. S. Malvar, Speech dereverberation via maximum-kurtosis subband adaptive filtering, Proc. IEEE Int'l Conf. Acoustics, Speech, and Signal Processing, Salt Lake City, May 2001.
• P. A. Chou, A. E. Mohr, A. Wang, and S. Mehrotra, Error control for receiver-driven layered multicast of audio and video, IEEE Trans. Multimedia, March 2001.
• P. A. Chou and Z. Miao, Rate-distortion optimized streaming of packetized media, IEEE Transactions on Multimedia, April 2006.
• Yong Rui, Thomas S. Huang, and Sharad Mehrotra, Content-based Image Retrieval with Relevance Feedback in MARS, Proc. IEEE Int'l Conf. Image Processing, Santa Barbara, October 1997.