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Complexity scalable motion compensated wavelet video encoding

IEEE Transactions on Circuits and Systems for Video Technology 2005年第8期15卷 982-992页

作者： Turaga, Deepak S. Van Der Schaar, Mihaela Pesquet-Popescu, Beatrice Wireless Communications and Networking Philips Research USA Briarcliff Manor NY 10510 United States IBM T.J. Watson Research Center Hawthorne NY 10532 United States Department of Electrical and Computer Engineering University of California Davis Davis CA 95616-5294 United States Signal and Image Processing Department Télécom Paris 75634 Paris Cedex 13 France Media Delivery Architectures Department IBM T.J. Watson Research Center Hawthorne NY Electrical and Computer Engineering Department University of California Davis

We present a framework for the systematic analysis of video encoding complexity, measured in terms of the number of motion estimation (ME) computations, that we illustrate on motion compensated wavelet video coding schemes. We demonstrate the graceful complexity scalability of these schemes through the modification of the spatiotemporal decomposition structure and the ME parameters, and the use of spatiotemporal prediction. We generate a wide range of rate-distortion-complexity (R-D-C) operating points for different sequences, by modifying these options. Using our analytical framework we derive closed form expressions for the number of ME computations for these different coding modes and show that they accurately capture the computational complexity independent of the underlying content characteristics. Our frame-work for complexity analysis can be combined with rate-distortion modeling to determine the encoding structure and parameters for optimal R-D-C tradeoffs. © 2005 IEEE.

关键词： Image coding

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Submicron-resolution optical coherence tomography using noncollinear parametric down-conversion

Submicron-resolution optical coherence tomography using nonc...

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2005 Quantum Electronics and Laser Science Conference (QELS)

作者： Carrasco, S. Nasr, M.B. Sergienko, A.V. Saleh, B.E.A. Teich, M.C. Torres, J.P. Torner, L. Quantum Imaging Laboratory Department of Electrical and Computer Engineering Boston University Boston MA 02215 United States ICFO-Institut de Ciencies Fotoniques Department of Signal Theory and Communications Universitat Politecnica de Catalunya 08034 Barcelona Spain

Submicron axial resolution in optical coherence tomography is demonstrated using one output beam from a broadband noncollinear parametric down-conversion source. The large spectral bandwidth is achieved by tightly foc... 详细信息

ISBN: (纸本)1557527962

关键词： Tomography

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A robust mobile speed estimator in fading channels: performance analysis and experimental results

A robust mobile speed estimator in fading channels: performa...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Hong Zhang A. Abdi Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

In this paper we propose a novel speed estimation technique, based on the characteristics of the power spectrum of mobile fading channels. Our analytic performance analysis, verified by Monte Carlo simulations, shows that the simple yet low-complexity estimator is not only robust to both Gaussian and non-Gaussian noises, but also insensitive to nonisotropic scattering observed in practical situations at the mobile. The estimator performs very well in both two- and three-dimensional propagation environments, where the latter case has not been studied so far, to the best of our knowledge. The utility of the new method is further demonstrated by applying it to the measured data

关键词： Fading Performance analysis Gaussian noise Frequency Working environment noise Additive noise Mobile communication signal processing Noise robustness Gaussian processes

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Distributed signature sequence adaptation via pricing for downlink of MC-CDMA system

Distributed signature sequence adaptation via pricing for do...

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IEEE Workshop on signal processing Advances in Wireless communications (SPAWC)

作者： J. Zhu Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A distributed signature sequence adaptation scheme is considered for the downlink of MC-CDMA system, wherein each mobile user selfishly adapts its signature sequences to improve its own performance objective with no consideration to the other users in the system. Pricing is introduced to each user's performance objective to make that user notice the power it consumes. It then serves as a control signal to motivate users to efficiently share the limited transmission power at base station, even thought the adaptation of users signature sequences is independent. It is shown that the proposed adaptation scheme will converge to a set of signature sequences at which no user can further improve its own performance with unilateral adaptation. Simulation result indicates that a simple linear pricing function with a properly chosen unit price can significantly improve the system performance.

关键词： Pricing Downlink Multicarrier code division multiple access Base stations System performance Channel state information Multiple access interference Mobile communication Multiaccess communication Distributed algorithms

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A class of novel blind source extraction algorithms based on a linear predictor

A class of novel blind source extraction algorithms based on...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Wei Liu D.P. Mandic A. Cichocki Department of Electrical & Electronic Engineering Communications and Signal Processing Research Group Imperial College London UK Laboratory for Advanced Brain Signal Processing RIKEN Brain Science Institute Japan

A rigorous analysis of the performance of a blind source extraction structure based on a linear predictor is provided. It is shown that by minimising the mean square prediction error, it is only possible to reach a solution subject to an arbitrary orthogonal transformation, in a manner similar to the principal component analysis. To remove this uncertainty, we propose a new cost function which caters for the ambiguous power levels of the source signals. A novel adaptive blind source extraction algorithm is derived and an alternative method with prewhitening is also introduced. Simulation results verify the proposed algorithms.

关键词： signal processing algorithms Vectors signal analysis Performance analysis Higher order statistics Algorithm design and analysis Educational institutions Laboratories Principal component analysis Uncertainty

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MIMO frequency selective channel estimation using aperiodic complementary sets of sequences

MIMO frequency selective channel estimation using aperiodic ...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Shuangquan Wang A. Abdi Center for Wireless Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Accurate estimation of MIMO frequency selective fading channels is important for reliable communication. In this paper, a new channel estimation scheme which relies on uncorrelated aperiodic complementary sets of sequences is proposed. Theoretical analysis and Monte-Carlo simulation show that the estimator achieves the minimum possible Cramer-Rao lower bound (CRLB). Furthermore, low-complexity algorithms for both ASIC/FPGA and DSP implementations are provided, using the special structure of the uncorrelated aperiodic complementary sets of sequences

关键词： MIMO Frequency estimation Channel estimation Fading State estimation signal processing Wireless communication signal processing algorithms Application specific integrated circuits Field programmable gate arrays

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Effective memory reduction scheme used for reference frames in H.264/AVC video codec

Effective memory reduction scheme used for reference frames ...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Chih-Chang Chen Sheng-Shiung Chen O.T.C. Chen Chien-Fa Chen Fang-Chu Chen Department of Electrical Engineering Signal and Media Laboratories National Chung Cheng University Taiwan Digital Signal Processing Tech. Department of Computer & Communications Research Laboratory Industrial Technology and Research Institute Taiwan

In the H.264/AVC video codec, multiple reference frames are applied for motion estimation to provide good coding efficiency. However, multiple reference frames also require more memory cost than one reference frame used in a video codec. To minimize the amount of memory requirement, this work proposes to add a decision unit in the H.264/AVC codec to store these reference frames. The said decision unit would look closely at macroblock (MB) of the currently decoded frame to determine it's storage type to be compressed or reconstructed data, according to the encoding parameters of subblocks in this MB. Furthermore, an adaptive scheme is proposed to store the currently decoded frame as reconstructed picture for lowering the computational complexity and using the buffer in full. Experimental results reveal that the proposed memory reduction scheme requires lower complexity and better picture quality than the conventional work. Therefore, the proposed memory reduction scheme can be widely used in various applications of the H.264/AVC codec to minimize the memory requirement.

关键词： Automatic voltage control Video codecs Decoding Buffer storage Motion estimation Costs Computational complexity Videoconference Video compression Encoding

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Punctured binary turbo-codes with optimized performance

Punctured binary turbo-codes with optimized performance

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IEEE Conference on Vehicular Technology (VTC)

作者： I. Chatzigeorgiou M.R.D. Rodrigues I.J. Wassell R. Carrasco Laboratory for Communication Engineering Computer Laboratory University of Cambridge UK Communications and Signal Processing Group Department of EE&C Engineering University of Newcastle Australia

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About room response equalization and dereverberation

About room response equalization and dereverberation

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IEEE Workshop on Applications of signal processing to Audio and Acoustics

作者： M. Karjalainen T. Paatero J.N. Mourjopoulos P.D. Hatziantoniou Laboratory of Acoustics and Audio Signal Processing Helsinki University of Technology Finland Audio Group Wire Communications Lab Electrical and Computer Engineering Department University of Patras Patras Greece

Improvement of sound reproduction in rooms by signal processing techniques has been studied seriously for more than twenty years. Such methods are called for example dereverberation, room (response) equalization, and room (response) correction. Understanding the limitations and quality criteria for such methods is gradually achieved through studies of this highly multidimensional problem. In the present paper we discuss the terminology and goals, compare some recent approaches of these techniques in practical cases, and finally point out future challenges

关键词： Acoustic signal processing Multidimensional signal processing Multidimensional systems Terminology

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A Graphical Model Formulation of the DNA Base-Calling Problem

A Graphical Model Formulation of the DNA Base-Calling Proble...

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IEEE Workshop on Machine Learning for signal processing

作者： L. Andrade-Cetto E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center for Research and Graduate Studies Electrical and Computer Engineering Department Northeastern University Boston MA USA

A first order variable dependence (FOVD) probabilistic graphical model is introduced to capture the complex inter-event dependencies that are present in DNA sequencing data. In this framework, DNA base-calling is addressed as a parameter estimation problem using maximum likelihood methods. The FOVD model accounts for dependencies between neighboring alleles and statistically characterizes the size of signal peaks. Our experimental results suggest that the resulting unsupervised classification base-calling algorithms (i) achieve accuracy that exceeds on average that of the-state-of-the art base-callers, (ii) work well for a variety of data set types without requiring costly recalibration

关键词： Graphical models Sequences Data mining Random variables Digital signal processing DNA computing Data engineering Parameter estimation Maximum likelihood detection Maximum likelihood estimation

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