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Erratum to: “A fast and stable snake algorithm for medical images” [Pattern Recognition Letters 20 (5) (1999) 507–512]

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Pattern Recognition Letters 1999年第10期20卷 1069-1069页

作者： Dong Joong Kang In So Kweon Signal Processing Lab. Samsung Advanced Institute of Technology P.O. Box 111 Suwon 440-600 South Korea Department of Electrical Engineering Korea Advanced Institute of Science and Technology Daejun Gusong South Korea

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Adaptive context based sequential prediction for lossless audio compression 9

Adaptive context based sequential prediction for lossless au...

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9th European signal processing Conference, EUSIPCO 1998

作者： Giurcǎneanu, Ciprian Doru Tǎbuş, Ioan Astola, Jaakko Signal Processing Lab. Tampere University of Technology P.O. BOX 553 Tampere33101 Finland

In this paper we propose the use of adaptive-context-based prediction in a sequential mode for lossless audio compression. We show that lossless compression algorithms with sequential context based prediction can achieve better compression results than with forward-frame-based linear prediction. Two distinct algorithms are proposed and evaluated for audio signal sampled at 48 kHz with 16 bits/sample. The context quantization and prediction in both algorithms are similar to those used in an algorithm previously proposed for image compression [7] but new solutions are provided for modelling of errors and collecting the coding statistics. The first algorithm uses histogram bucketing in a small number of contexts in conjunction with an arithmetic coder. The second algorithm uses parametric modelling of errors in a large number of contexts in conjunction with Golomb-Rice encoding.

关键词： Forecasting

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A highly-scaleable FIR using the radix-4 Booth algorithm

A highly-scaleable FIR using the radix-4 Booth algorithm

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1998 23rd IEEE International Conference on Acoustics, Speech and signal processing, ICASSP 1998

作者： Chen, Oscal T.-C. Liu, Wei-Lung Hsieh, Hsun-Chang Wang, Jeng-Yih Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chia-Yi Taiwan Digital Signal Processing Dept. Computer and Communication Research Lab. Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)0780344286

A highly-scaleable FIR architecture based on the radix-4 Booth algorithm has been designed with scaleable dynamic ranges of input data and filter coefficients. The radix-4 Booth algorithm is demonstrated to have a lower hardware complexity and a fairer throughput rate than the other radix approaches. In order to achieve scaleability, the configurable-connection function between latches of input data, and filter taps has been explored. The precision of filter coefficients is adjustable by using a path-control function. Especially, the proposed architecture only employs data-path controls to realize the scaleable issue without changing the word lengths and components of input latches and filter taps. The pre-processing unit for manipulating input data and post-processing unit for computing accumulation results have been realized to support scaleable operations. Based on our architecture in a chip design, the cascaded configuration between chips is also easily accomplished for many industrial applications. © 1998 IEEE.

关键词： Input output programs

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Robust estimation of FOE (Focus of Expansion) from unreliable motion flows

Robust estimation of FOE (Focus of Expansion) from unreliabl...

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Visual Communications and Image processing '98

作者： Song, Mun-Sup Kim, Man-Bae Samsung Advanced Inst. of Technology Signal Processing Lab. P.O. Box 111 Suwon 440-600 Korea Republic of

We present a recursive estimation technique for recovering FOE (Focus of Expansion) from unreliable motion or optical flow. The estimation of FOE is of importance to the analysis of camera motion, especially, in the case that the camera motion is purely translational. Our work is based on the observation that there is strong dependence between FOE estimation and motion flows. Therefore, as the FOE depends on the motion flow, a good motion flow can be obtained from accurate FOE. We assume that the camera motion is purely translational and there is no object motion in the scene. The technique used for the elimination of unreliable motion flow is orthogonal regression method. We combine FOE estimation with the elimination algorithm of unreliable motion flows. Experiments using both simulation and real scenes show that our proposed method works robustly under the condition that the percentage of outliers is varying between [0%,20%].

关键词： Motion estimation

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Adaptive encoding of fixed codebook in CELP coders

Adaptive encoding of fixed codebook in CELP coders

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1998 23rd IEEE International Conference on Acoustics, Speech and signal processing, ICASSP 1998

作者： Kim, Hong Kook Human and Computer Interaction Lab. Information Processing Sector Samsung Advanced Institute of Technology San 14 Nongseo-Ri Kiheung-Eup Yongin-City Kyungki-Do 449-712 Korea Republic of

ISBN: (纸本)0780344286

We propose an adaptive encoding method of fixed codebook in CELP coders and implement an adaptive fixed code excited linear prediction (AF-CELP) speech coder. The AF-CELP exploits the fact that the fixed codebook contribution to the speech signal is also periodic as the adaptive codebook (or pitch filter) contribution. By modeling the fixed codebook with the pitch lag and the gain from the adaptive codebook, the AF-CELP can be implemented at low bit rates as well as low complexity. Listening tests show that a 6.4 kbit/s AF-CELP has a comparable quality to the 8 kbit/s CS-ACELP. © 1998 IEEE.

关键词： signal encoding

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Design of very low-sensitivity and low-noise recursive digital filters using a cascade of low-order wave lattice filters

Design of very low-sensitivity and low-noise recursive digit...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： J. Yli-Kaakinen T. Saramaki Signal Process. Lab. Tampere Univ. of Technol. Finland Signal Processing Laboratory Tampere University of Technology Tampere Finland

One of the best structures for implementing recursive digital filters are the wave lattice filters (parallel connections of two allpass filters). They are characterized by many attractive properties, such as a reasonably low coefficient sensitivity, a low roundoff noise level, and the absence of parasitic oscillations. The main drawback is that if the stopband attenuation is very high, then many bits are required for the coefficient representation. In order to get around this problem, a structure consisting of a cascade of wave lattice filters is introduced in this paper. The main advantage of the proposed structure compared to the direct wave lattice filter is that the poles for the new structure are further away from the unit circle. This means that the number of bits required for the data and coefficient representations are significantly reduced compared to the direct wave lattice filters. The price paid for these reductions is a slight increase in the overall filter order. By properly selecting the number of wave lattice filters and optimizing them, their coefficients can be implemented by a few powers-of-two. Filters of this kind are very attractive in VLSI implementations where a general multiplier is very costly.

关键词： Digital filters Lattices IIR filters Attenuation signal processing Noise level Transfer functions Passband lab.ratories Computational complexity

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Solution of the super-resolution problem through extrapolation of the orthogonal spectra using multi-valued neural technique 9

Solution of the super-resolution problem through extrapolati...

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9th European signal processing Conference, EUSIPCO 1998

作者： Aizcnbcrg, Igor Aizenberg, Naum Astola, Jaakko Egiazarian, Karen K.IJ.Leuven Departeine111 ESAT/SISTA HeverleeB-3001 Belgium Department of Cybernetics State University of Uzhgorod Uzhgorod294015 Ukraine Signal Processing Lab. Tampere University of Technology P.O. Box 553 Tampere Finland

Two methods of the orthogonal spectra extrapolation problem are considered in this paper. Both solutions are based on the application of multi-valued neural element as a filter and as an extrapolator. The first method consist of approximation of the spectra in the higher frequency part using an iterative approximation and multi-valued non-linear filtering. The second method is reduced to the prediction of the spectral coefficients corresponding to the higher frequency part using possibility of MVN to predict time-series. Application of the proposed methods to solut ion of the super-resolution problem are presented.

关键词： Extrapolation

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Electromyogram data compression using single-tree and modified zero-tree wavelet encoding

Electromyogram data compression using single-tree and modifi...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： P. Wellig Zhenlan Cheng M. Semling G.S. Moschytz Signal & Inf. Process. Lab. Fed. Inst. of Technol. Zurich Switzerland Signal and Information Processing Lab Swiss Federal Institute of Technology Zurich Switzerland

The long-term analysis of the neuromuscular systems, and applications in telemedicine, make electromyogram (EMG) data compression a subject of great practical importance. However, in spite of the increasing demand, only a few studies have been published on this subject. In this paper, we present two wavelet-based lossy compression techniques for EMG data. We propose modifications to the so-called 'embedded zero-tree wavelet coder', which yield very good results in ECG compression applications. We have implemented the algorithms in Matlab.and C++ and tested then with several EMG recordings.

关键词： Data compression Encoding Electromyography Electrocardiography signal resolution Filters Wavelet coefficients Pulse modulation Wavelet packets Telemedicine

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Fast object recognition using salient line groups

Fast object recognition using salient line groups

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： Dong Jung Kang In So Kweon Signal Processing Lab. Samsung Advanced Institute of Technology Suwon South Korea Department of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) Seoul South Korea

ISBN: (纸本)0780344650

This paper presents an effective recognition method based on perceptual organization of low level features detected in an image. The method uses a dynamic programming (DP) based formulation to represent various line groups such as convex, concave, and more complex patterns consisting of convex and concave shapes. The essential features of perceptual organization such as endpoint proximity, collinearity, parallelism, and connectivity of lines, are incorporated into the DP based formulation as energy terms. As endpoint proximity, we detect two line junctions from image lines. We then search for junction groups by using collinearity constraint between the junctions. A DP-based search algorithm is used to detect a junction chain similar to the model chain, based on a local comparison. The proposed system is able to find line groups from images with broken lines and strong background clutters. We demonstrate the feasibility of our DP-based matching method based on perceptual organization using real images.

关键词： Object recognition Combinatorial mathematics Image recognition signal processing computer vision Shape Indexing signal processing algorithms Robustness Image segmentation

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TUTMAC: a medium access control protocol for a new multimedia wireless local area network

TUTMAC: a medium access control protocol for a new multimedi...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： M. Hannikainen J. Knuutila A. Letonsaari T. Hamalainen J. Jokela J. Ala-Laurila J. Saarinen Signal Process. Lab. Tampere Univ. of Technol. Finland Nokia Mobile Phones Wireless Data Tampere Finland Signal Processing Laboratory Tampere University of Technology Tampere Finland

This paper presents a medium access control (MAC) protocol called TUTMAC for a new wireless local area network (TUTWLAN). The design objective has been to develop a simple, multimedia service capable protocol that provides sufficient medium utilisation efficiency and guarantees QoS (quality of service) parameters. The developed system utilises a centralised (base station controlled) network architecture. A limited number of portable stations can be associated with the same base station, i.e. in the same TUTWLAN cell. TUTMAC is connection oriented: the bandwidth is allocated deploying constant bit-rate TDMA based data channels that are reserved by exchanging short control messages. The connection parameters can be dynamically altered during the data exchange session. Currently, a TUTWLAN prototype is being developed comprising both TUTMAC software and platform hardware modules. The prototype will support up to eight simultaneous data-transfer connections each having 64 to 512 kbit/s data transmission bandwidth.

关键词： Media Access Protocol Access protocols Quality of service Base stations Bandwidth Software prototyping Wireless application protocol Wireless LAN Centralized control Control systems

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