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3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the最新文献

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Thin plate energy minimization via GNC 通过GNC实现薄板能量最小化
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296483
D. Gelli, D. Vitulano
{"title":"Thin plate energy minimization via GNC","authors":"D. Gelli, D. Vitulano","doi":"10.1109/ISPA.2003.1296483","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296483","url":null,"abstract":"This paper focuses on the minimization of a thin plate problem with discontinuities by means of GNC (graduated nonconvexity) algorithm. GNC applied to such an energy allows us to achieve the exact solution of this problem, and to overcome drawbacks concerning minimization achieved by a \"two-steps\" process based on thin membrane. Typical distortions of the latter are avoided with a little higher computational effort.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114567280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel low power low voltage full adder cell 一种新型低功耗低电压全加法器
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296940
Chip-Hong Chang, Mingyang Zhang, J. Gu
{"title":"A novel low power low voltage full adder cell","authors":"Chip-Hong Chang, Mingyang Zhang, J. Gu","doi":"10.1109/ISPA.2003.1296940","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296940","url":null,"abstract":"The power-delay product is a direct measurement of the energy expended per operational cycle of an arithmetic circuit. Lowering the supply voltage of the full adder cell to achieve low power-delay product is a sensible approach to dramatically improve the power efficiency at sustainable speed of arithmetic circuits composed of such instances at high level design. In this paper, a novel design of a low power 1-bit full adder cell is proposed where the simultaneous generation of XOR and XNOR outputs by pass logic is exploited but with swing restoration circuit added to make ultra low voltage operation down to 0.5 V feasible. A novel complementary CMOS carry generation circuit is devised to produce full-swing and balanced outputs with strong drivability. Simulation results show that our full adder circuit outstrips many latest designs in energy efficiency and has the lowest power-delay product over a wide range of voltages among several low power adder cells of different CMOS logic styles.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114855795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Problem-oriented change of image dimensionality 问题导向的图像维度变化
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296899
J. Valantinas, R. Valantinas
{"title":"Problem-oriented change of image dimensionality","authors":"J. Valantinas, R. Valantinas","doi":"10.1109/ISPA.2003.1296899","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296899","url":null,"abstract":"The paper describes a recursive algorithm or solving the image dimensionality change problem. Preservation of image smoothness serves as the image dimensionality change criterion. The algorithm itself is based on the application of space filling Hilbert curves of various degrees. To demonstrate the usefulness of the proposed image dimensionality change idea, a new encoding technique fur multi-dimensional binary \"silhouette\" images is presented. The image compression effect is attained by successive elimination of monochrome blocks of maximal size from the one-dimensional analogue of the image.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115279597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A statistical detection of an anomaly/target from noisy tomographic projections 从噪声层析投影中对异常/目标进行统计检测
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296930
L. Fillatre, I. Nikiforov
{"title":"A statistical detection of an anomaly/target from noisy tomographic projections","authors":"L. Fillatre, I. Nikiforov","doi":"10.1109/ISPA.2003.1296930","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296930","url":null,"abstract":"The problem of detecting an anomaly/target from a limited number of noisy tomographic projections is addressed from the statistical point of view. We study an unknown two-dimensional scene composed of an environment, considered as a nuisance parameter set, with a possibly hidden anomaly/target. An optimal statistical invariant test is proposed to solve such a problem.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115646996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
On the estimation of signals transmitted in multichannel from Chandrasekhar recursions 钱德拉塞卡递归多信道传输信号的估计
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296388
S. Nakamori, A. Hermoso-Carazo, J. Jiménez-López, J. Linares-Pérez
{"title":"On the estimation of signals transmitted in multichannel from Chandrasekhar recursions","authors":"S. Nakamori, A. Hermoso-Carazo, J. Jiménez-López, J. Linares-Pérez","doi":"10.1109/ISPA.2003.1296388","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296388","url":null,"abstract":"In this paper, we propose a fast Chandrasekhar-type algorithm to solve the least mean-squared error linear filtering problem of a wide-sense stationary signal, transmitted through different channels, considering uncertainty in the observations. We assume that the state-space model of the signal is not available and the algorithm is derived by using covariance information. The computational advantages of the proposed algorithm are illustrated in a numerical example.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"240 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121073313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Correction of geometric lens distortion through image warping 通过图像翘曲校正几何透镜畸变
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296951
Luca Lucchese, San, K. Mitra
{"title":"Correction of geometric lens distortion through image warping","authors":"Luca Lucchese, San, K. Mitra","doi":"10.1109/ISPA.2003.1296951","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296951","url":null,"abstract":"This paper presents a new technique for estimating and correcting the geometric distortion produced by common off-the-shelf lenses. The task of recovering the three most important parameters modeling the lens distortion of a digital camera is formulated as a problem of image warping where the distorted image of a planar calibration plate taken by the camera has to be registered onto the virtual undistorted image of the same target that would be produced by an ideal pinhole digital camera in a convenient position with respect to it. The Levenberg-Marquardt algorithm is chosen for solving the associated minimization problem in which the cost function is the squared /spl Lscr//sub 2/ norm of the difference between the intensities of the reference and distorted image. In this paper, the algorithm is applied to a practical case of lens distortion correction, the experimental results reported here confirm the effectiveness of the image warping approach.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122813791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Optimizing high-speed satellite communication with high-order modulation via adaptive signal processing at both ends of the link 通过链路两端的自适应信号处理优化高阶调制高速卫星通信
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296927
L. Giugno, V. Lottici, M. Luise
{"title":"Optimizing high-speed satellite communication with high-order modulation via adaptive signal processing at both ends of the link","authors":"L. Giugno, V. Lottici, M. Luise","doi":"10.1109/ISPA.2003.1296927","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296927","url":null,"abstract":"Interactive multimedia wideband satellite services (especially in the field of digital TV) will require the adoption of (coded) spectrally-efficient high-level modulation techniques in future satellite transmission standards. It is known that such modulations suffer from nonlinear distortion caused by the on board (nonlinear) high-power amplifier, so that countermeasures are to be adopted in this respect. The aim of this paper is to investigate the possibility to adopt a suited mixture of adaptive data predistortion (DP) at the transmitter and adaptive nonlinear equalization (NLE) at the receiver to counteract nonlinear distortion at best. We show first that the sensitivity to nonlinear distortion of (uncoded) 16-QAM and 64-QAM constellations is greatly reduced by clever use of both techniques. We also investigate the performance improvement brought forth by such techniques when using a recently introduced optimized 16-APK constellation, as well as its extended 64-point version. We finally re-evaluate the optimized link performance assuming turbo-coded 16-QAM and 16-APK constellations with iterative SISO (soft input soft output) decoding.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126342878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Investigations on link system level interface for MIMO systems MIMO系统链路系统级接口研究
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296924
A. Szabo, N. Geng, A. Seegert, W. Utschick
{"title":"Investigations on link system level interface for MIMO systems","authors":"A. Szabo, N. Geng, A. Seegert, W. Utschick","doi":"10.1109/ISPA.2003.1296924","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296924","url":null,"abstract":"Performance evaluation of cellular systems that take advantage of antenna arrays at both ends of the link must reflect not only the link level aspects, but also the effects related to the entire system. System level simulation on the other hand can not contain all the link level processing, as this would be computational prohibitive. In this paper we analyze a possible interlace between the link level and the system level in the case of frequency selective channels based on the output of a space-time MMSE equalizer. We derive the theoretical signal to interference and noise ratio (SINR) at the output of the equalizer and show how this measure can be used to approximate the performance of the link. We show how the SINR can be translated in bit error rate (BER) and throughput, given as example the high speed downlink packet access system, and validate with computer simulations the accuracy of the interface.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126036365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Fast variational PCA for functional analysis of dynamic image sequences 快速变分PCA用于动态图像序列的功能分析
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296958
V. Šmídl, A. Quinn
{"title":"Fast variational PCA for functional analysis of dynamic image sequences","authors":"V. Šmídl, A. Quinn","doi":"10.1109/ISPA.2003.1296958","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296958","url":null,"abstract":"Principal component analysis (PCA) is a well-known algorithm used in many areas of science. It is usually taken as the golden standard for dimensionality reduction. However, PCA usually does not provide information about uncertainty of its results, thus preventing further investigation of model structure. A full Bayesian treatment is not feasible. Recently, variational PCA (VPCA) was proposed as an approximate Bayesian solution of the problem. In this paper, we summarise the iterative solution to the PCA problem arising from a variational approach. A new model with orthogonality restrictions is constructed in order to overcome its limitations. Notably, a highly efficient computational algorithm for variational PCA is revealed. It is applied in the analysis of functional medical images, yielding solution in a fraction of the time needed by the conventional technique.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129252925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Blind separation of instantaneous mixtures of impulsive stable sources 脉冲稳定源瞬时混合的盲分离
3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the Pub Date : 2003-09-18 DOI: 10.1109/ISPA.2003.1296922
Mohamed Sahmoudi, Karim Abed-Meraim, M. Benidir
{"title":"Blind separation of instantaneous mixtures of impulsive stable sources","authors":"Mohamed Sahmoudi, Karim Abed-Meraim, M. Benidir","doi":"10.1109/ISPA.2003.1296922","DOIUrl":"https://doi.org/10.1109/ISPA.2003.1296922","url":null,"abstract":"This paper introduces a method of blind separation which extracts impulsive sources from their instantaneous mixtures. The \"heavy-tailed\", or \"impulsive\" signals are characterized by the nonexistence of the finite second (or higher) order moments. Such signals can be modeled by real-valued symmetric alpha-stable (SaS) processes. A novel blind source separation (BSS) algorithm for extracting \"impulsive\" source signals from their observed mixtures is presented. This algorithm is based on the minimum dispersion criterion. A new whitening procedure by the normalized covariance matrix is introduced and used as the first step of the algorithm. Some computer simulations are presented illustrating the performances of proposed method.","PeriodicalId":218932,"journal":{"name":"3rd International Symposium on Image and Signal Processing and Analysis, 2003. ISPA 2003. Proceedings of the","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129480380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
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