Signal Processing

Principal Investigator: A. Katsaggelos

Sponsor: U.S. Department of Defense, 3/98 – 3/99

Video compression is the enabling technology behind the multimedia revolution we are experiencing. At high compression ratios, however, undesirable artifacts appear in the compressed video. In this project, we develop techniques for removing such artifacts and improving the visual quality of the reconstructed video.

Principal Investigator: Aggelos K. Katsaggelos

Sponsor: Motorola Center for Telecommunications Research, 8/98-8/99

This project develops a speech driven visual communication device.

Speech is analyzed and used to synthesize visual speech features.

By efficiently utilizing the correlation between audio and visual

information speech intelligibility can increase for impaired hearing

people, or for people who use telephone communication systems in noisy

environments.

Principal Investigator: Aggelos K. Katsaggelos

Sponsor: Motorola Center for Telecommunications Research, 8/98-8/99

In this project pre- and post-processing algorithms are developed for increasing the coding efficiency of a coder and the visual quality of the reconstructed video. The algorithms under development are standard compliant, finding therefore wide applicability. We are primarily concerned with high bit-rate video compression applications (up to 10 Mbps) using the MPEG-2 and MPEG-4 standards and CCIR601 resolution video. We are also primarily concerned with real-time (video rate) implementation of such algorithms.

Principal Investigator: A. Katsaggelos

Sponsor: Motorola Center for Telecommunications Research, 8/98 – 8/99

This project develops efficient algorithms to compress a video signal in a scalable manner. That is, the recipients of this video (for example, over the Internet) will be able to view it at a certain quality that is dictated by the speed of their connection and by the resolution of their TV or computer monitor.

Investigators: M. Honig, S. Jordan, A. K. Katsaggelos and C. C. Lee

Sponsor: Motorola Center for Telecommunications Research, 8/98 – 8/99

This project investigates methods for supporting wireless multimedia communications. The work is aimed at enhancing the capabilities of current wireless technologies such as code-division multiple access, which is used for mobile cellular voice services.

Investigators: A. Sahakian, A. Katsaggelos, and P. Kumar

Sponsor: AT&T / Lucent Technologies Foundation, 11/96 – 12/99

This grant establishes a multidisciplinary teaching and research laboratory incorporating elements of optical communications, digital image processing, and video processing in an optical video network. Students will be able to set up and test cutting-edge modulation, compression, and coding techniques used in the optical transmission of video.

Investigators: A. Sahakian and S. Swiryn (Evanston Hospital)

Sponsor: The Dr. Scholl’s Foundation, 12/98-12/00

Atrial fibrillation is the most common abnormal heart rhythm, affecting millions of Americans with symptoms such as palpitations or difficulty in breathing, and increasing the risk of stroke. Though there are palliative treatments available, there is only limited understanding of the mechanism. Perhaps because of this, there is only limited success in treatment. Much research has focused on depolarization (the electrical activation of heart cells) and its patterns during fibrillation. In this project, we are studying repolarization (the recovery of cells after activation). This may be a more important factor in the development, maintenance, and termination of atrial fibrillation.

A. Katsaggelos and N. M. Nasrabadi, eds., Proc. Applications of Artificial Neural Networks in Image Processing, IS&T/SPIE, San Jose, CA, 1999.

A. Katsaggelos, N. P. Galatsanos, M. Wernick, and M. Choi, "Multi-channel Image Recovery," in The Image and Video Processing Handbook, A. Bovik, ed., 1999.

A. Katsaggelos, "Iterative Image Restoration," in The Image and Video Processing Handbook, A.Bovik, ed., 1999.

A. Katsaggelos, G. Melnikov, "Rate-Distortion Techniques in Image and Video Coding," in Multimedia Signal Processing, L. Guan, S. Y. Kung, J. Larsen, eds, 1999.

* ( For ease of identification, each citation in this and the following sections will begin with the group faculty member(s)’ name(s))

A. Katsaggelos, J. J. Williams, J. C. Rutledge, and D. C. Garstecki, "Frame Rate and Viseme Analysis for Multimedia Applications," Journal of VLSI Signal Processing Systems, vol. 23, nos. 1/2, pp. 7-23, Oct. 1998.

A. Katsaggelos and G. M. Schuster, "An Optimal Quadtree-Based Motion Estimation and Motion-Compensated Interpolation Scheme for Video Compression," IEEE Trans. Image Processing, vol. 7, no. 11, pp. 1505-1523, Nov. 1998.

A. Katsaggelos, G. M. Schuster and G. Melnikov, "Operationally Optimal Vertex-Based Shape Coding," IEEE Signal Processing Magazine, vol. 15, no. 6, pp. 91-108, Nov. 1998.

A. Katsaggelos, K. Haris, S. N. Efstratiadis, and N. Maglaveras, "Hybrid Image Segmentation Using Watersheds and Fast Region Merging," IEEE Trans. Image Processing, vol. 7, no. 12, pp. 1684-1699, Dec. 1998.

A. Katsaggelos, M.C. Hong, L. Kondi, and H. Schwab, "Video Error Concealment Techniques," Signal Processing: Image Communications, special issue on Error Resilient Video, 14(6-8), pp. 437-492, 1999.

A. Katsaggelos, R. Molina and J. Mateos, "Bayesian and Regularization Methods for Hyperparameter Estimation in Image Restoration," vol. 8, no. 2, pp. 231-246, IEEE Trans. Image Processing, Feb. 1999.

A. Katsaggelos, G. M. Schuster and G. Melnikov, "A Review of the Minimum Maximum Criterion for Optimal Bit Allocation Among Dependent Quantizers," IEEE Trans. on Multimedia, vol. 1, no. 1, pp. 3-17, March 1999.

A. Katsaggelos, C-J. Tsai, "Dense Disparity Estimation with a Divide-and-Conquer Disparity-Space Image Technique," IEEE Trans. on Multimedia, vol. 1, no. 1, pp. 18-29, March 1999.

A. Sahakian, M.S.L. Peterson, M. Hamer, T. Votapka, T., T. Ji, and Swiryn, S. "A simultaneous multichannel monophasic action potential electrode array for epicardial repolarization mapping," Proceedings of the IEEE Computers in Cardiology Conference, Volume 25, Dec. 1998, pp. 125-128.

A. Katsaggelos, F. Ishtiaq, L. P. Kondi, M.-C. Hong, M. Banham, and J. Brailean, "Error Resilience and Concealment in Video Coding," Proc. EUSIPCO-98, pp. 221-228, Rhodes, Greece, Sept. 8-11, 1998.

A. Katsaggelos, K. May and T. Stathaki, "Iterative Blind Image Restoration Using Local Constraints," Proc. EUSIPCO-98, pp. 335-338, Rhodes, Greece, Sept. 8-11, 1998.

A. Katsaggelos, M-C. Hong and T. Stathaki, "A Regularized Mixed-Norm Multichannel Image Restoration Approach," Proc. 9th IEEE Signal Proc. Workshop on Statistical and Array Proc., pp. 220-223, Portland, OR, Sept. 14-16, 1998.

A. Katsaggelos, G. Melnikov and G. M. Schuster, "Simultaneous Optimal Boundary Encoding and Variable-Length Code Selection," Proc. 1998 IEEE International Conf. on Image Processing, vol. 1, pp. 256-260, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, J. Mateos, C. Ilia, B. Jimenez, and R. Molina, "Reduction of Blocking Artifacts in Block Transformed Color Images," Proc. 1998 IEEE International Conf. on Image Processing, vol. 1, pp. 401-405, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, C.-J. Tsai and N. P. Galatsanos, "Total Least Squares Estimation of Stereo Optical Flow," Proc. 1998 IEEE International Conf. on Image Processing, vol. 2, pp. 622-626, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, K. May, T. Stathaki, and A. Constantinides, "Iterative Determination of Local Bound Constraints in Iterative Image Restoration," Proc. 1998 IEEE International Conf. on Image Processing, vol. 2, pp. 833-837, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos and D. L. Tull, "Regularized Restoration of Partial-Response Distortions in Sporadically Degraded Images," Proc. 1998 IEEE International Conf. on Image Processing, vol. 3, pp. 732-736, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, L. P. Kondi and F. Ishtiaq, "On Video SNR Scalability," Proc. 1998 IEEE International Conf. on Image Processing, vol. 3, pp. 934-936, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, G. Melnikov and G. M. Schuster, "Exploiting Temporal Correlation in Shape Coding," Proc. Asilomar Conf. on Signals, Systems, and Computers, pp. 1601-1605, Pacific Grove, CA, Nov. 1-4, 1998.

A. Katsaggelos, A. Segall and S. Acton, "Sampling Conditions for Anisotropic Diffusion," Proc. SPIE Conf. on Visual Communications and Image Processing, SPIE vol., San Jose, CA, Jan. 25-27, 1999.

A. Katsaggelos, G. Melnikov and G. M. Schuster, "Inter-Mode Vertex-Based Optimal Shape Coding," Proc. 1999 Int. Conf. Acoust., Speech, Signal Processing, Phoenix, AZ, March 15-19, 1999.

A. Katsaggelos, R. Molina and J. Abad, "Bayesian Image Restoration Using a Wavelet-Based Subband Decomposition," Proc. 1999 Int. Conf. Acoust., Speech, Signal Processing, Phoenix, AZ, March 15-19, 1999.

A. Katsaggelos, C.-J. Tsai and N. P. Galatsanos, "Optical Flow Estimation from Noisy Data Using Differential Techniques," Proc. 1999 Int. Conf. Acoust., Speech, Signal Processing, Phoenix, AZ, March 15-19, 1999.

A. Katsaggelos, C.-J. Tsai and N. P. Galatsanos, "Maximum-Likelihood Optical Flow Estimation Using Differential Constraints," Proc. 1999 IEEE Workshop on Nonlinear Signal and Image Processing, pp. 53-56, Antalya, Turkey, June 20-23, 1999.

A. Katsaggelos, IEEE Signal Processing Magazine, Sept. 98, Nov. 98, Jan. 99, March 99, May 99, July 99.

A. K. Katsaggelos, "Image and Video Compression and Transmission," short course, University of Granada, Granada, Spain, July 5-6, 1999.

A. Katsaggelos, plenary talk, "Advances and Challenges in Multimedia Communications," IASTED Int. Conf. On Signal and Image Processing, Las Vegas, NV, Oct. 28, 1998.

A. Katsaggelos, plenary talk, "Current Issues and Developments in Multimedia Signal Processing," Motorola Science Advisory Board (SABA) Induction meeting, Motorola Galving Center, Schaumburg, IL, May 11, 1999.

A. Katsaggelos, distinguished speaker, "Multimedia Signal Processing", Integrated Media Systems Center, University of Southern California, Nov. 23, 1998.

A. Katsaggelos , "A Paradigm for Recovery and Compression Techniques", Stanford University, Dept. of Electrical Engineering, Feb. 1, 1999.

A. Katsaggelos, "Current Issues and Developments in Video Coding and Transmission", US Army Research Laboratory, Adelphi, MD, April 9, 1999.

A. Katsaggelos, "Implementing MPEG7/MPEG7 for Interactive TV Systems," IBM Research Labs, Yorktown, NY, Interactive TV Workshop, August 17, 1999.

A. Katsaggelos, "Error Resilience and Concealment in Video Coding," EUSIPCO-98, Rhodes, Greece, Sept. 8-11, 1998.

A. Katsaggelos, "Iterative Determination of Local Bound Constraints in Iterative Image Restoration," 1998 IEEE International Conf. on Image Processing, Chicago, IL, Oct. 5-7, 1998.

A. Katsaggelos, "Joint Optimal Boundary Encoding and DPCM Model Selection," Asilomar Conf. on Signals, Systems, and Computers, Pacific Grove, CA, Nov. 1-4, 1998.

A. Katsaggelos, "Inter-Mode Vertex-Based Optimal Shape Coding," 1999 Int. Conf. Acoust., Speech, Signal Processing, Phoenix, AZ, March 15-19, 1999.

A. Katsaggelos, "Maximum-Likelihood Optical Flow Estimation Using Differential Constraints," IEEE Workshop on Nonlinear Signal and Image Processing, Antalya, Turkey, June 20-23, 1999.

A. Sahakian, "A simulatenous multichannel monophasic action potential electrode array for epicardial repolarization mapping," IEEE Computers in Cardiology Conference, Cleveland, Sept. 13-16, 1998.

A. Sahakian "Processing signals from the atrium of the heart," at Biomedical Signal Interpretation workshop, Rosemont, IL., Jun 12-14, 1999.

A. Sahakian, session chairman, "Mapping Biosignals" at Biomedical Signal Interpretation Workshop, Rosemont, IL., Jun 12-14, 1999.

A. Katsaggelos, organizer/session chairman," Video Compression and Communications," at European Signal Proc. Conference, Rhodes, Greece, Sept. 8-11, 1998.

A. Katsaggelos, session chairman, "Video Transmission", at Asilomar Conf. On Signals, Systems, and Computers, Pacific Grove, CA, Nov. 1-4, 1998.

A. Katsaggelos, session chairman, "Image Sequence Processing", at Int. Conf. Acoustics, Speech, Signal Proc., Phoenix, AZ, March 15-19, 1999.

A. Katsaggelos, session chairman, Video Processing, at 1999 IEEE Workshop on Nonlinear Signal and Image Processing, Antalya, Turkey, June 20-23, 1999.