Publications

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Ph.D. Thesis 

   *

     A. Ortega Optimization techniques for adaptive quantization of image and video under delay constraints, Ph.D. Thesis, Dept. of Electrical Engineering, Columbia University, Jun. 1994

Journal Publications 

   * K. Ramchandran, A. Ortega, K. M. Uz and M. Vetterli, "Multiresolution Broadcast for Digital HDTV Using Joint Source-Channel Coding", IEEE Journal on Selected Areas in Communications , Vol. 11, No. 1, Jan. 1993.
   * A. Ortega, K. Ramchandran and M. Vetterli, "Optimal Trellis-based Buffered Compression and Fast Approximations", IEEE Transactions on Image Processing, Vol. 3, No. 1, Jan. 1994.
   * K. Ramchandran, A. Ortega and M. Vetterli, "Bit Allocation for Dependent Quantization with Applications to Multiresolution and MPEG Video Coders", IEEE Transactions on Image Processing , Aug. 1994.
   * A. Ortega, M. Garrett and M. Vetterli, "Rate constraints for packet video transmission based on joint source/network criteria". Annales des Telecommunications. Vol. 50, No. 7-8, pp. 603--616, Jul.-Aug. 1995.
   * A. Ortega and M. Vetterli, `` Adaptive scalar quantization without side information, IEEE Transactions on Image Processing, Vol. 6, No. 5, pp. 665--676, May 1997.
   * C.-Y. Hsu, A. Ortega and A. R. Reibman, "Joint Selection of Source and Channel Rate for VBR Video Transmission under ATM Policing Constraints" IEEE Journal on Sel. Areas in Communications, Special Issue on Real-Time Video Services in Multimedia Networks, Vol. 15, No. 6, pp. 1016-1028, August 1997.
   * Liang-Jin Lin, Antonio Ortega, "Bit-Rate Control Using Piecewise Approximated Rate-Distortion Characteristics ", IEEE Transactions on Circuits and Systems for Video Technology , Vol. 8, No. 4, pp. 446-459 , Aug. 1998.
   * T. V. Lakshman, A. Ortega and A. R. Reibman, "VBR video: Trade-offs and potentials ", Proceedings of the IEEE, Vol. 86, No. 5, pp. 952--973, May 1998.
   * A. Ortega and K. Ramchandran, "Rate-Distortion Techniques in Image and Video Compression," IEEE Signal Processing Magazine , pp. 23-50, Vol. 15, No. 6, Nov. 1998.
   * Chi-Yuan Hsu, Antonio Ortega and Masoud Khansari, `` Rate Control for Robust Video Transmission over Burst-Error Wireless Channels , IEEE Journal on Selected Areas in Communications, Special Issue on Multimedia Network Radios, Vol. 17, No. 5, pp. 756-773, May 1999.
   * Y. Yoo, A. Ortega and B. Yu, "Image Subband Coding using Progressive Classification and Adaptive Quantization", IEEE Transactions on Image Processing, Vol. 8, No. 12, pp. 1702-1715, Dec. 1999.
   * W. Woo and A. Ortega, ""Optimal Blockwise Dependent Quantization for Stereo Image Coding", IEEE Transactions on Circuits and Systems for Video Technology , (Transactions letter), Sep. 1999.
   * C. Chrysafis and A. Ortega, "Line Based, Reduced Memory, Wavelet Image Compression", IEEE Transactions on Image Processing , vol. 9, No. 3, pp. 378--389, March 2000.
   * W. Woo and A. Ortega, "Overlapped Block Disparity Compensation with Adaptive Windows for Stereo Image Coding", IEEE Transactions on Circuits and Systems for Video Technology , (Transactions letter), vol. 10, No. 2, pp. 194-200, March 2000.
   * K. Lengwehasatit and A. Ortega, "Probabilistic Partial Distance Fast Matching for Motion Estimation", IEEE Transactions on Circuits and Systems for Video Technology , Vol. 11, No. 2, pp. 139-152, Feb. 2001.
   * W. Jiang and A. Ortega, "Lifting Factorization Based Discrete Wavelet Transform Architecture Design," IEEE Transactions on Circuits and Systems for Video Technology , Vol. 11, No. 5, pp. 651--657, May 2001.
   * J. Cabrera, A. Ortega and J. I. Ronda, "Stochastic rate-control of video coders for wireless channels", IEEE Transactions on Circuits and Systems for Video Technology, Vol. 12, Num. 6, pp. 496--510, June 2002.
   * Z. Miao and A. Ortega, " Scalable Proxy Caching for Streaming Video Services over QOS and Best-effort networks " IEEE J. on Sel. Areas in Comm., Special issue on Internet Proxy Services, Accepted for publication, Dec. 2001.
   * R. Singh and A. Ortega, "Erasure Recovery in Predictive Coding Environmente using Multiple Description Coding", Journal of VLSI Signal Processing Systems for Signal, Image and Video Technology , Accepted for publication, Dec. 2001, to appear, 2002.
   * B. Beferull-Lozano and A. Ortega, " Efficient Quantization for Overcomplete Expansions in R^N, " IEEE Transactions on Information Theory , Vol. 49, No. 1, pp. 129-150, January, 2003.
   * D. Comas, R. Singh, A. Ortega and F. Marques, "Unbalanced Multipled Description Video Coding Based on a Rate-Distortion Optimization", EURASIP Journal on Applied Signal Processing , Accepted for publication, Nov. 2002.
   * K. Demirciler and A. Ortega, " Vector Quantizer Design by Reduced Complexity Deterministic Annealing ", IEEE Transactions on Image Processing , Submitted, May 2002.
   * K. Lengwehasatit and A. Ortega, " Scalable Variable Complexity Approximate Forward DCT ", IEEE Transactions on Circuits and Systems for Video Technology, Nov. 2004.
   * J. Cabrera, J.I. Ronda, A. Ortega, and N. Garcia" Stochastic Rate Control of Interframe Video Coders for Lossy Channels ", IEEE Transactions on Circuits and Systems for Video Technology, In review, 2004.

Book Chapters 

   * A. Ortega, " Video transmission over ATM networks", in Microsystems Technology for Multimedia Applications, B. Sheu et al. Eds., IEEE Press, May 1995.
   * A. Ortega and M. Khansari, "Video Transmission over Wireless Links: State of the Art and Future Challenges", in Handbook of Communication Technologies: The Next Decade , R. Osso, Ed., CRC Press, 1999.
   * A. Ortega, ""Variable Bit-rate Video Coding ", in Compressed Video over Networks , M.-T. Sun and A.~R. Reibman, Eds, pp. 343-382, Marcel Dekker, New York, NY, 2000.
   * A. Ortega and Y. Liu, "Lossy Compression of Haptic Data", in Touch in Virtual Environments, M. McLaughlin, Ed., IMSC Press, Prentice-Hall, 2001.

Selected Refereed International Conferences

1993-94 

   * A. Ortega, M. W. Garrett and M. Vetterli, " Toward joint optimization of VBR video coding and packet network traffic control", In Proc. Packet Video Workshop '93, Berlin, Mar. 1993.
   * A. Ortega, Z. Zhang and M. Vetterli, `` A Framework for the Optimization of a Multiresolution Remote Image Retrieval System, Infocom'94, pp. 672--679, Toronto, Jun. 94.
   * A. Ortega and M. Vetterli, ``Multiple leaky buckets for increased statistical multiplexing of ATM video", Packet Video Workshop '94, Portland, Oregon, Sept. 94.
   * A. Ortega and M. Vetterli, `` Adaptive quantization without side information, Int'l. Conf. on Image Proc. ICIP '94, Austin, Texas, Oct. 1994.

1995 

   * A. Ortega and K. Ramchandran " Forward-adaptive quantization with optimal overhead cost for image and video coding with applications to MPEG video coders, IS&T/SPIE, Digital Video Compression: Algorithms and Technologies '95, San Jose, Feb. 95.
   * Liang-Jin Lin, Antonio Ortega and C. C. Jay Kuo `` Gradient-based buffer control technique for MPEG , In Proc. of Visual Communic. and Image Proc., VCIP '95, Taipei, Taiwan, May 1995
   * Liang-Jin Lin, Antonio Ortega and C. C. Jay Kuo `` A Gradient-based rate control algorithm with applications to MPEG Video , 2nd. Int'l. Conf. on Image Proc. ICIP '95, Washington, D.C., Oct. 1995.
   * Antonio Ortega and Masoud Khansari ``Rate control for video coding over variable bit rate channels with applications to wireless transmission , 2nd. Int'l. Conf. on Image Proc. ICIP '95, Washington, D.C., Oct. 1995.
   * Chi-Yuan Hsu and Antonio Ortega `` Joint Encoder and VBR Channel Optimization with Buffer and Leaky Bucket Constraints , Symposium on Multimedia Communications and Video Coding, Brooklyn, NY, Oct. 1995.
   * Youngjun Yoo and Antonio Ortega, `` Adaptive Quantization Without Side Information using SVQ and TCQ, in Proc. of the 29th Asilomar Conf. on Signals, Sys. and Computers, Pacific Grove, CA, Oct.-Nov. 1995.

1996 

   * Youngjun Yoo, Antonio Ortega, and Kannan Ramchandran, ``A Novel Hybrid Technique for Discrete Rate-Distortion Optimization with Applications to Fast Codebook Search for SVQ , in Proc. of ICASSP'96, Atlanta, GA, May 1996.
   * Liang-Jin Lin, Antonio Ortega and C. C. Jay Kuo,`` Cubic Spline Approximation of Rate and Distortion Functions for MPEG Video , In Proc. of IS\&T/SPIE, Digital Video Compression: Algorithms and Technologies '96, San Jose, Feb. 96.
   * Liang-Jin Lin, Antonio Ortega and C. C. Jay Kuo `` Rate Control Using Spline-Interpolated R-D Characteristics , In Proc. of Visual Communic. and Image Proc., VCIP '96, Orlando, Fla, March 1996
   * Woontack Woo and Antonio Ortega, `` Stereo Image Compression with Disparity Compensation Using the MRF Model , In Proc. of Visual Communic. and Image Proc., VCIP '96, Orlando, Fla, March 1996
   * Y. Chung, C.-Y. Hsu, A. Ortega and J. Kuo, "A histogram based method for video-network interfaces in ATM networks" , Packet Video Workshop'96, Brisbane, Australia, March 1996.
   * A. Ortega, ``Optimal rate allocation under multiple rate constraints, Data Compression Conference'96, Snowbird, UT, Mar. 1996.
   * Y. Yoo, A. Ortega and B. Yu, "Adaptive Quantization of Image Subbands with Efficient Overhead Rate Selection". ICIP'96, Lausanne, Switzerland.
   * C. Chrysafis and A. Ortega, "Context-based Adaptive Image Coding". Proc. of the 30th Asilomar Conf. on Signals, Sys. and Computers, Pacific Grove, CA, Nov. 1996.

1997 

   * Chi-Yuan Hsu, Antonio Ortega and Masoud Khansari, `` Rate control for robust video transmission over wireless channels , In Proc. of Visual Communic. and Image Proc., VCIP '97, San Jose CA, Feb 1997
   * Woontack Woo and Antonio Ortega, `` Stereo Image Compression based on Disparity Field Segmentation , In Proc. of Visual Communic. and Image Proc., VCIP '97, San Jose CA, Feb 1997
   * Krisda Lengwehasatit and Antonio Ortega, ``DCT Computation with Minimal Average Number of Operations , In Proc. of Visual Communic. and Image Proc., VCIP '97, San Jose CA, Feb 1997
   * C. Chrysafis and A. Ortega, "Efficient Context-based Lossy Wavelet Image Coding". Proc. of Data Compression Conference, Snowbird, UT, Mar. 1997.
   * Krisda Lengwehasatit and Antonio Ortega, ``Distortion/Decoding Time Tradeoffs in Software DCT-based Image Coding , In Proc. of ICASSP'97, Munich, Germany, April 1997
   * Y. Chung, A. Ortega and J. Kuo, ``Call Admission: Dimensioning a Single VBR Video Source Using Transition Probability Matrix , IEEE International Symposium on Circuits and Systems, Hong Kong, June 1997.
   * Antonio Ortega, Fabio Carignano, Serge Ayer and Martin Vetterli, ``Soft Caching: Web Cache Management for Images , In IEEE Signal Processing Society Workshop on Multimedia, Princeton, NJ, June 1997
   * Wenqing Jiang and Antonio Ortega, `` Forward/Backward Adaptive Context Selection with Applications to Motion Vector Field Encoding , 4th. Int'l. Conf. on Image Proc. ICIP '97, Santa Barbara, CA, Oct. 1997.

1998 

   * Wenqing Jiang and Antonio Ortega, `` Backward Context Adaptive Interframe Coding , Visual Communications and Image Processing'98, San Jose, CA, Jan. 1998.
   * Woontack Woo and Antonio Ortega ``Dependent Quantization for Stereo Image Coding, Visual Communications and Image Processing'98, VCIP98, San Jose, Jan. 1998.
   * Chi-Yuan Hsu and Antonio Ortega ``A Lagrangian optimization approach to rate control for delay-constrained video transmission over burst-error channels, In Proc. of ICASSP'98, Seattle, Washington, May 1998.
   * Krisda Lengwehasatit and Antonio Ortega "DCT Computation Based on Variable Complexity Fast Approximation", In Proc. of Intl' Conf. of Image Proc., ICIP'98, Chicago, IL, October 1998
   * Paul Fernandez and Antonio Ortega, "" An Input Dependent Algorithm for the Inverse Discrete Wavelet Transform", In Proceedings of the Thirty Sixth Asilomar Conference on Signals, Systems and Computers, Asilomar '98, November 1-4, 1998.
   * Youngjun Yoo, Younggap Kwon, and Antonio Ortega `` Embedded Image-Domain Adaptive Compression for Simple Images, Proc. of the 32nd Asilomar Conf. on Signals, Sys. and Computers, Pacific Grove, CA, Nov. 1998.
   * Zhourong Miao and Antonio Ortega ``Rate control algorithms for video storage on disk based video servers, In 32nd Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, November, 1998.

1999 

   * Woontack Woo, and Antonio Ortega, " Modified Overlapped Block Disparity Compensation for Stereo Image Coding," In Proc. of Visual Communic. and Image Proc., VCIP '99, San Jose, CA, Jan 1999
   * Wenqing Jiang and Antonio Ortega " Multiple Description Coding via Polyphase Transform and Selective Quantization, In Proc. of Visual Communic. and Image Proc., VCIP '99, San Jose, USA, Jan 1999
   * W. Jiang , A. Ortega , " Multiple Description Coding via Scaling-Rotation Transform, " Proc. of ICASSP 1999 , Phoenix, AZ, Mar. 1999.
   * K. Lengwehasatit and A.Ortega, " Complexity-distortion Tradeoffs in Vector Matching basd on Probabilistic Partial Distance Techniques ", Proc of DCC'99, Snowbird, UT, Mar. 1999.
   * Z.Miao and A.Ortega," Proxy Caching for effficient video services over the Internet ", Packet Video Workshop '99, New York,NY,Apr. 1999.
   * W.Jiang, A.Ortega," Parallel architecture for the discrete wavelet transform based on the lifting factorization, "SPIE, Parallel and Distributed Methods for Image Processing III, Denver, CO, Jul 1999.
   * A.Ortega, W. Jiang, P. Fernandez and C. Chrysafis,"Implementations of discrete wavelets transform:Complexity, Memory and Parallelization issues",(Invited Paper),SPIE, Wavelet Applications in Signal and Image Processing VII, Denver, CO, Jul 1999.
   * R. Singh and A. Ortega, " Erasure recovery in predictive coding environments using Multiple Description Coding ", Workshop on Multimedia Signal Processing, Denmark, Sept. 1999.
   * C.Chrysafis and A.Ortega," An Algorithm for Low Memory Wavelet Image Compression ", ICIP'99, Kobe, Japan, Oct. 1999.
   * Y.Yoo, Y.Kwon and A.Ortega,"Embedded Image-Domain Compression sing Context Models", ICIP '99,Kobe, Japan, Oct. 1999.
   * W.Jiang and A.Ortega,"Efficient Discrete Wavelet Transform Architectures Based on Filterbank Factorizations",ICIP'99, Kobe, Japan, Oct. 1999.
   * K.M.Chugg, K.Demirciler and A.Ortega,"Soft Information for Source Channel Coding and Decoding", in 33rd Asilomar Conf. on Signal, System and Computers, Pacific Grove,CA , Oct. 24-27,1999, pp. 326-331.
   * B.Beferull-Lozano and A.Ortega," Coding Techniques for Steerable Transforms ",in Proc. of Asilomar'99,Pacific Grove, CA Oct. 1999.

2000 

   * P.Sagetong and A.Ortega, " Optimal Bit Allocation for channel-adaptive Multiple Description Coding ", Image and Video Communication and Processing 2000,pp 53-63, SanJose,CA, Jan 2000.
   * S.Lee and A.Ortega,"Online rate control for Digital cameras for near constant distrotion based on mimimum/maximum criterion", Image and Video Communication and Processing 2000, San Jose, CA, Jan 2000.
   * R. Singh, A. Ortega, L. Perret and W. Jiang, " Comparison of Multiple Description Coding and Layered Coding based on the Network Simulations", Image and Video Communications and Processing 2000, San Jose, CA, Jan 2000.
   * W.Pan and A.Ortega, " Complexity-Scalable Transform Coding using Variable Complexity Algorithm ", Data Compression Conference, DCC 2000, Snowbird, UT, Mar. 2000.
   * W.Jiang and A.Ortega, " Multiple Description Speech Coding for Robust Communication over lossy packet networks", IEEE Intl. Conf. on Multimedia and Expo, ICME 2000, New York, NY, Jul-Aug. 2000.
   * N.Srinivasmurthy, Q.Zhu, A.Ortega and A.Alwan,"Toward Efficient and Scalable Sppech Compression Schemes for Robust Speech Recognition Applications", IEEE Intl. Conf. on Multimedia and Expo. ICME 2000, NewYork, NY, Jul-Aug 2000.
   * C.Chrysafis and A.Ortega, " Minimum memory implementations of the lifting scheme ", SPIE Conf. SanDiego, CA, Aug.2000.
   * N. Aranki, W. Jiang and A. Ortega,"FPGA-Based Parallel Implementation for the lifting Discrete Wavelet Transform",Parallel and Distributed Methods for Image Processing IV,SPIE's 45th Annual Meeting, San Diego, CA, Aug. 2000.
   * K. Lengwehasatit and A. Ortega, " Rate Complexity Distortion Optimization for Quadtree-Based DCT Coding ",ICIP 2000, Vancouver,BC, Canada, September 2000.
   * K. Lengwehasatit and A. Ortega, " Computationally Scalable Distance Based Fast Search Motion Estimation ", ICIP 2000, Vancouver, BC, CanadaSeptember 2000.
   * A. Ortega, B. Beferull-Lozano, N. Srinivasamurthy, and H. Xie,"Compression for Recognition and Content based Retrieval", In Proc. of the Eurppean Signal Processing Conference, EUSIPCO'00 , Tampere, Finland, September 2000(Invited Paper).
   * R.Singh and A.Ortega,"Adaptive Lookahead based Lossy Context Coding",ICIp 2000, Vancouver, BC, Canada, September 2000.
   * Z. Miao and A. Ortega," Optimal Scheduling for the Streaming of Scalable Media ", Proc. of Asilomar Conf. on Signals, Systems and Computers, Pacific Grove, CA, Oct-Nov. 2000.

2001 

   * W. Pan, A. Ortega, I. Hajj-Ahmad and R.Sannino, " Proxy-Based Aopproaches for IDCT Accleration ", VCIP 2001, San Jose, CA, Jan 2001.
   * H.Xie and A.Ortega,"Feature representation and Compresion for content based retrieval", VCIP 2001, San Jose, CA, Jan 2001.
   * N.Srinivasmurthy and A.Ortega,"Joint Compression-Classification with Quantizer/Classifier Dimension Mismatch",VCIP 2001, San Jose, CA, Jan 2001.
   * B. Beferull-Lozano and A.Ortega, " Construction of Low Complexity Regular Quantizers for Over-Complete Expansions in R^n ", In Proc. of DDC 2001, Snowbird, UT, Mar. 2001.
   * B. Beferull-Lozano and A.Ortega,"Efficient Quantizers for Over Complete Exapnsion in Rexp(N), in Proc. of ICASSP 2001, Salt Lake City, UT, May 2001.
   * J.Chou, K. Ramachandran and A. Ortega,"High Capacity Audio Data Hiding for Nosiy Channel", in Proc. of ICASSP 2001, Salt Lake City, UT, May 2001.
   * H. Komi and A. Ortega," Analysis of Cache Efficiency in 2D Wavelet Transform", in Proc. IEEE Intl. Conference on Multimedia and Expo, ICME 2001, Tokoyo, Japan, Aug 2001.
   * P. Sagetong and A. Ortega," Analytical Model-Based Bit Allocation for Wavelet Coding with Application to Multiple Description Coding and Region of Interest Coding ", in Proc. IEEE Intl. Conf. on Multimedia and Expo., ICME 2001, Tokoyo, Japan, Aug. 2001.
   * W. Jiang and A. Ortega," A novel packet loss recovery technique for multimedia communication ", in Proc. of IEEE Intl. Conf. on Multimedia and Expo., ICME 2001, Tokyo, Japan Aug. 2001.
   * N.Srinivasmurthy, A. Ortega and S. Narayanan," Use of model transformation for distributed speech recognition",ISCA Workshop on Adaptation Methods for Speech Recognition, Sophia Antipolis, France, August 29-30, 2001.
   * N.Srinivasmurthy, A. Ortega and S. Narayanan,"Efficient Scalable Speech Compression for Scalable Speech Recognition ", In Proc. of Eurospeech 2001, Aarborg, Denmark, Sept. 2001.
   * D. Comas, R. Singh and A.Ortega," Rate-Distortion Optimization in a Robust Video Transmission Based on Unbalanced Multiple Description Coding", IEEE Worksop on Multimedia Signal Processing, MMSP01, Cannes, France, Oct. 2001.
   * S. Lee and A. Ortega," A Novel Approach for Image Compression in Digital Cameras with Bayer Color Filter Array", in Proc. of IEEE Intl. Conference on Image Processing,ICIUP '01, Thessaloniki,Greece, Oct. 2001.
   * J. Cabrera, A. Ortega and J.I.Ronda,"Stochastic Rate-Control of Video Coders for Wireless Channels", in Proc. of IEEE Intl. Conference on Image Processing, ICIUP' 01, Thessaloniki, Greece, Oct. 2001.
   * P. Thiennviboon, A. Ortega and K. M.Chugg," Simplified Grid Passing Algorithm with Application to Digital Image Halftoning ", in Proc. of IEEE Intl. Conference on Image Processing, ICIUP'01, Thessaloniki, Greece, Oct. 2001.
   * W. Pan and A. Ortega, " Buffer Control for Variable Complexity Fano Decoders ", Globecom 2001, San Antonio, TX, Nov. 2001.

2002 

   * H. Chung, A. Ortega, A. A. Sawchuck, " Low Complexity Motion Estimation for Long Term Memory Motion Compensation", VCIP 2002, San Jose, CA, Jan 2002.
   * Z. Miao and A. Ortega, " Expected Run-Time Distortion Based Scheduling for Delivery of Scalable Media ", Packet Video Workshop 2002, Pittsburgh, PA, Jan. 2002.
   * R. Singh and A. Ortega,"Modeling Temporal Dependence in packet loss using universal modeling concepts", Submitted, Packet Video Workshop 2002, Pittsburgh, PA, Jan. 2002.
   * L. Vasudevan and A. Ortega, `` Processing-Aware Compression for Sensor Networks, 2nd IEEE Sensor Array and Multichannel Signal Processing Workshop, Aug. 2002.
   * J. Hespanha, A. Ortega and L. Vasudevan, " Towards the Control of Linear Systems with Minimum Bit-Rate ", 15th Intl. Symp. on Mathematical Theory of Networks and Systems, MTNS 2002, Notre Dame, IN, Aug. 2002.
   * P.Sagetong and A. Ortega," Rate Distortion Model and Analytical Bit Allocation for Wavelet based Region of Interest Coding", ICIP 2002, Oct. 2002.
   * H. Chung and A. Ortega," Low Compexity Motion Estimation Algorithm by Multiresolution Search for Long-Term Memory Motion Compensation", Submitted, ICIP 2002, Oct. 2002.
   * S. Y. Lee and A. Ortega," Optimal rate control for video coding based on a hybrid MMAX/MMSE criterion", ubmitted, ICIP 2002, Oct. 2002.
   * Z. Miao and A. Ortega," Fast Adaptive Media Scheduling Based on Expected Run-Time Distortion ", Proc. of Asilomar Conf. on Signals, Systems and Computers, Pacific Grove, CA, Nov. 2002.

2003 

   * P. Thiennviboon, A. Ortega and K. M.Chugg,"Model Based Digital Image Halftoning using Iterative Reduced-Complexity Grid Message-passing Algorithm", in Proc. of SPIE Color Imaging: Processing, Harcopy and Applications. San Jose, CA, Jan. 2003.
   * H. Wang and A. Ortega," Robust Video Communication by Combining Scalability and Multiple Description Coding Techniques.", in Proc. of SPIE, San Jose, CA, Jan. 2003.
   * R. Rejaie and A. Ortega, " PALS: Peer to Peer Adaptive Layered Streaming , in Proc. of NOSSDAV'03 Monterey, CA, June 2003.
   * N. Srinivasamurthy, A. Ortega, and S. Narayanan" Towards Optimal Encoding for Classification with Applications to Distributed Speech Recognition , in Proc. of Eurospeech 2003 Geneva, Sept. 2003.
   * J. Cabrera, J. I. Ronda, A. Ortega and N. Garcia, " Stochastic rate-control of interframe video coders for VBR channels", in Proc. of ICIP 2003, Barcelona, Sept. 2003.
   * B. Beferull-Lozano, H. Xie, and A. Ortega, " Rotation-Invariant Features Based on Steerable Transforms with an Application to Distributed Image Classification", in Proc. of ICIP 2003, Barcelona, Sept. 2003.
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