From WikiBiron
Revision as of 18:19, 7 July 2005 by Wikiboss (talk | contribs)

COPYRIGHT NOTICE: All the documents on this server have been submitted by their authors to scholarly journals or conferences as indicated, for the purpose of non-commercial dissemination of scientific work. The manuscripts are put on-line to facilitate this purpose. These manuscripts are copyrighted by the authors or the journals in which they were published. You may copy a manuscript for scholarly, non-commerical purposes, such as research or instruction, provided that you agree to respect these copyrights.

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

Complete set of PhD theses can be found here

Journal Publications

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








  • 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.


  • 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, ICIP' 01, Thessaloniki, Greece, Oct. 2001.
  • P. Thiennviboon, A. Ortega and K. M.Chugg,"[ Simplified Grid Passing Algorithm with Application to Digital Image Halftoning <a>", 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.


  • 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.


[ Back to A. Ortega's homepage]