Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296320
S. Benierbah, M. Khamadja
We propose, here, a new technique for exploiting spectral redundancy in color and multispectral images. To decorrelate spectrally the pixels, inter-band compensated prediction is used, where the intensity in a given band is approximated by compensating the changes between it and an adjacent band, as is done in video coding. There is a large spatial similarity between the spectral bands but at different intensity levels caused by the difference in sensitivity of the bands, imposed by the imaging system. The coder will predict the luminance intensity of a pixel by compensating this effect between the bands. A possible very simple scheme is presented here, and applied to color images. The first results obtained with this approach are similar to those of the current state-of-the-art lossless coders with color transforms. More important, this technique is very simple and allows many additional promoting improvements in the future.
{"title":"Lossless color and multispectral images coding with inter-band compensated prediction","authors":"S. Benierbah, M. Khamadja","doi":"10.1109/ISCCSP.2004.1296320","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296320","url":null,"abstract":"We propose, here, a new technique for exploiting spectral redundancy in color and multispectral images. To decorrelate spectrally the pixels, inter-band compensated prediction is used, where the intensity in a given band is approximated by compensating the changes between it and an adjacent band, as is done in video coding. There is a large spatial similarity between the spectral bands but at different intensity levels caused by the difference in sensitivity of the bands, imposed by the imaging system. The coder will predict the luminance intensity of a pixel by compensating this effect between the bands. A possible very simple scheme is presented here, and applied to color images. The first results obtained with this approach are similar to those of the current state-of-the-art lossless coders with color transforms. More important, this technique is very simple and allows many additional promoting improvements in the future.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117119471","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296281
M. Smaoui-Kallel, Y. Jemaa, M. Jaidane
The adaptive phase locked loop are used in digital communication systems to recursively estimate phase introduced by carrier's misadjustments and all time varying channel, allowing thus a better synchronization between the transmitter and the receiver. A rigorous analysis of PLL performances is difficult due to the non-linearity of the equation that govern the PLL. In this paper through the finite alphabet approach dedicated to the digital communication context, we generalize the 1/sup st/ order development of the adaptive PLL behavior for a higher order.
{"title":"Adaptive PLL performances analysis for digital transmission context","authors":"M. Smaoui-Kallel, Y. Jemaa, M. Jaidane","doi":"10.1109/ISCCSP.2004.1296281","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296281","url":null,"abstract":"The adaptive phase locked loop are used in digital communication systems to recursively estimate phase introduced by carrier's misadjustments and all time varying channel, allowing thus a better synchronization between the transmitter and the receiver. A rigorous analysis of PLL performances is difficult due to the non-linearity of the equation that govern the PLL. In this paper through the finite alphabet approach dedicated to the digital communication context, we generalize the 1/sup st/ order development of the adaptive PLL behavior for a higher order.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121341705","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296228
M. Jérôme, N. Ellouze
Images and image sequences are the important contents of the multi-media information. As well for images as for image sequences, storage space or bandwidth must be large if there is no compression. After the discrete cosine transform (DCT) which is used in JPEG for still image compression, in MPEG for image sequences compression and in H263+ for low bit rate image sequences coding, wavelet transform (WT) is the new technology used now since it outperforms the DCT, in particular in still images compression. This is confirmed by JPEG2000 which is based on WT. The bloc effects which are the main drawback of DCT are overcome by WT technology. In this paper, we present the images and image sequences analysis based on the rate distribution of embedded zerotree wavelet (EZW) symbols in one hand and in the other hand its application to coding. The results are competitive with other codecs in the literature.
{"title":"Images and image sequences analysis and coding based on rate distribution of embedded zerotree wavelet symbols","authors":"M. Jérôme, N. Ellouze","doi":"10.1109/ISCCSP.2004.1296228","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296228","url":null,"abstract":"Images and image sequences are the important contents of the multi-media information. As well for images as for image sequences, storage space or bandwidth must be large if there is no compression. After the discrete cosine transform (DCT) which is used in JPEG for still image compression, in MPEG for image sequences compression and in H263+ for low bit rate image sequences coding, wavelet transform (WT) is the new technology used now since it outperforms the DCT, in particular in still images compression. This is confirmed by JPEG2000 which is based on WT. The bloc effects which are the main drawback of DCT are overcome by WT technology. In this paper, we present the images and image sequences analysis based on the rate distribution of embedded zerotree wavelet (EZW) symbols in one hand and in the other hand its application to coding. The results are competitive with other codecs in the literature.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121358738","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296250
F. Doyle
Summary form only given. Understanding regulation is a critical hurdle in unraveling complex biological systems. As gene-level architectures become known, the open challenge is to assign predictable behavior to a known structure, the so-called "genotype-to-phenotype" problem. In response to this challenge, the discipline of systems biology has emerged with an integrative perspective towards determining complex systems behavior. A property of particular interest is the robustness of the biophysical network: the ability to maintain some target level of behavior or performance in the presence of uncertainty and/or perturbations. In biological systems, these disturbances can be environmental (heat, pH, etc.) or intrinsic to the organism (changes in kinetic parameters). While preliminary results are available for simple (low-dimensional, deterministic) biological systems, general tools for analyzing these tradeoffs are the subject of active research. The gene network which underlies circadian rhythms is an ideal system for robustness studies, owing to its remarkable performance in a highly uncertain environment. Of interest for control theoretic analyses, the dominant elements of the postulated architecture for Drosophila consist of nested negative autoregulatory feedback loops controlling the expression of timeless (tim) and period (per) interlocked with a positive feedback loop established via the dClock gene. Complex formation, regulated translocation and degradation of several of these gene products, which is additionally controlled (and delayed) by protein phosphorylation, add further levels of complexity to the system. In this talk, a number of quantitative tools from systems theory are presented as enabling methodologies for unraveling robust biological regulatory systems, with an emphasis on sensitivity analysis. Our work on modeling and analysis of the Drosophila circadian rhythm gene network are detailed, and generalizations are be drawn for the mammalian analog and for more general gene regulatory networks.
{"title":"A system biology approach to robustness analysis of circadian rhythm","authors":"F. Doyle","doi":"10.1109/ISCCSP.2004.1296250","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296250","url":null,"abstract":"Summary form only given. Understanding regulation is a critical hurdle in unraveling complex biological systems. As gene-level architectures become known, the open challenge is to assign predictable behavior to a known structure, the so-called \"genotype-to-phenotype\" problem. In response to this challenge, the discipline of systems biology has emerged with an integrative perspective towards determining complex systems behavior. A property of particular interest is the robustness of the biophysical network: the ability to maintain some target level of behavior or performance in the presence of uncertainty and/or perturbations. In biological systems, these disturbances can be environmental (heat, pH, etc.) or intrinsic to the organism (changes in kinetic parameters). While preliminary results are available for simple (low-dimensional, deterministic) biological systems, general tools for analyzing these tradeoffs are the subject of active research. The gene network which underlies circadian rhythms is an ideal system for robustness studies, owing to its remarkable performance in a highly uncertain environment. Of interest for control theoretic analyses, the dominant elements of the postulated architecture for Drosophila consist of nested negative autoregulatory feedback loops controlling the expression of timeless (tim) and period (per) interlocked with a positive feedback loop established via the dClock gene. Complex formation, regulated translocation and degradation of several of these gene products, which is additionally controlled (and delayed) by protein phosphorylation, add further levels of complexity to the system. In this talk, a number of quantitative tools from systems theory are presented as enabling methodologies for unraveling robust biological regulatory systems, with an emphasis on sensitivity analysis. Our work on modeling and analysis of the Drosophila circadian rhythm gene network are detailed, and generalizations are be drawn for the mammalian analog and for more general gene regulatory networks.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127306806","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296219
A. G. Armada, V. P. Gil Jiménez, J. Darriba
This paper analyzes the effects of phase noise in multi-user OFDM systems. The impact on system performance of different phase noise characteristics and received power among users is considered. The main conclusion that can be achieved is the importance of power control in order to avoid a near-fact effect. Besides, the presence of transceivers with bad phase noise characteristics can ruin the performance of better (more expensive) ones.
{"title":"Analysis of phase noise effects in multi-user OFDM","authors":"A. G. Armada, V. P. Gil Jiménez, J. Darriba","doi":"10.1109/ISCCSP.2004.1296219","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296219","url":null,"abstract":"This paper analyzes the effects of phase noise in multi-user OFDM systems. The impact on system performance of different phase noise characteristics and received power among users is considered. The main conclusion that can be achieved is the importance of power control in order to avoid a near-fact effect. Besides, the presence of transceivers with bad phase noise characteristics can ruin the performance of better (more expensive) ones.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122459152","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296326
C. Rus, R.C. Bilcur, K. Egiazarian, C. Rusu
This paper seeks to find ways to remove the unwanted information from the scanned GIS maps using wavelet domain hidden Markov models. WHMMs have proven to be a valuable tool for signal denoising, while they preserve the edges, so they can be used to remove the dithering effect that occurs during the printing process of the map. Linework data can be viewed as edges in the scanned map image. And, since WHMMs are well suited to images containing singularities (edges), they provide a good classifier for distinguishing between linework and elevation data (smoother areas in the image).
{"title":"Scanned maps processing using wavelet domain hidden Markov models","authors":"C. Rus, R.C. Bilcur, K. Egiazarian, C. Rusu","doi":"10.1109/ISCCSP.2004.1296326","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296326","url":null,"abstract":"This paper seeks to find ways to remove the unwanted information from the scanned GIS maps using wavelet domain hidden Markov models. WHMMs have proven to be a valuable tool for signal denoising, while they preserve the edges, so they can be used to remove the dithering effect that occurs during the printing process of the map. Linework data can be viewed as edges in the scanned map image. And, since WHMMs are well suited to images containing singularities (edges), they provide a good classifier for distinguishing between linework and elevation data (smoother areas in the image).","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114582852","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296439
A. Tiano
This paper deals with the identification of non linear multivariable models of underwater vehicles. For this purpose two different, recently proposed methods, are presented and compared from a methodological point of view. The first method is based on a Lyapunov approach, while the second one is based on the least squares approach. The two considered methods operate in the continuous time domain and can be applied to non linear models that are linear with respect to the unknown parameter vector. After an introduction, where the role of identification methods in the area of guidance and control of underwater vehicles is outlined, the mathematical models that are generally used for describing the dynamics of underwater vehicles are concisely presented. The main features of the two identification methods are then discussed and compared.
{"title":"Comparison of non linear identification methods for underwater vehicles","authors":"A. Tiano","doi":"10.1109/ISCCSP.2004.1296439","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296439","url":null,"abstract":"This paper deals with the identification of non linear multivariable models of underwater vehicles. For this purpose two different, recently proposed methods, are presented and compared from a methodological point of view. The first method is based on a Lyapunov approach, while the second one is based on the least squares approach. The two considered methods operate in the continuous time domain and can be applied to non linear models that are linear with respect to the unknown parameter vector. After an introduction, where the role of identification methods in the area of guidance and control of underwater vehicles is outlined, the mathematical models that are generally used for describing the dynamics of underwater vehicles are concisely presented. The main features of the two identification methods are then discussed and compared.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122217308","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296207
C. Fallaha, H. Kanaan, K. Al-haddad, M. Lavoie
This paper presents the performance of a linear control technique applied to an averaged model of a single-phase UPF two-stage boost rectifier. This technique consists of applying the frequency-domain linear control theory on a small signal model of the converter. It is then numerically downloaded on dSPACE hardware using the Matlab/Simulink tool, so that it could be applied on a real model of the converter. The characteristics of the proposed control scheme are discussed and compared in both steady state and transient regimes (load and voltage disturbance).
{"title":"Design of a digital linear controller for a single-phase UPF two-stage boost rectifier using the dSPACE tool of Matlab/Simulink","authors":"C. Fallaha, H. Kanaan, K. Al-haddad, M. Lavoie","doi":"10.1109/ISCCSP.2004.1296207","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296207","url":null,"abstract":"This paper presents the performance of a linear control technique applied to an averaged model of a single-phase UPF two-stage boost rectifier. This technique consists of applying the frequency-domain linear control theory on a small signal model of the converter. It is then numerically downloaded on dSPACE hardware using the Matlab/Simulink tool, so that it could be applied on a real model of the converter. The characteristics of the proposed control scheme are discussed and compared in both steady state and transient regimes (load and voltage disturbance).","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128574143","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296477
I. Slimene, S. B. Jebara, A. Benazza-Benyahia
In this paper, we are interested in multichannel speech denoising in the context of mobile communications. The conventional method exploits the "similarity" between the observations expressed by the coherence function. In this work, we aim at alleviating the drawbacks of this approach. More precisely, a wavelet or a multiwavelet transform is used to generate a multiresolution representation of the observations and the coherence between the resulting coefficients is computed. Experiments carried out on artificially and naturally noisy signals indicate that significant gains are achieved by the proposed method relatively to the classical coherence denoising technique.
{"title":"Use of coherence in wavelet and multiwavelet domain for microphone array speech enhancement","authors":"I. Slimene, S. B. Jebara, A. Benazza-Benyahia","doi":"10.1109/ISCCSP.2004.1296477","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296477","url":null,"abstract":"In this paper, we are interested in multichannel speech denoising in the context of mobile communications. The conventional method exploits the \"similarity\" between the observations expressed by the coherence function. In this work, we aim at alleviating the drawbacks of this approach. More precisely, a wavelet or a multiwavelet transform is used to generate a multiresolution representation of the observations and the coherence between the resulting coefficients is computed. Experiments carried out on artificially and naturally noisy signals indicate that significant gains are achieved by the proposed method relatively to the classical coherence denoising technique.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130607410","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}
Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296466
L. Mitiche, A. Adamou-Mitiche
Using model reduction, a new approach for low-order speech modeling is presented. In this approach, the modeling process starts with a relatively high-order (full-order) autoregressive AR model obtained by some classical methods. The AR model is then reduced using the state projection method, operating in the state space. The model reduction yields a reduced-order autoregressive moving-average (ARMA) model that interestingly preserves the key properties of the original full-order model such as stability. Line spectral frequencies (LSF) and signal-to-noise ratio (SNR) behavior are also investigated. To illustrate the performance and the effectiveness of the proposed approach, some computer simulations are conducted on some practical speech segments.
{"title":"A new approach for speech modeling based on model reduction","authors":"L. Mitiche, A. Adamou-Mitiche","doi":"10.1109/ISCCSP.2004.1296466","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296466","url":null,"abstract":"Using model reduction, a new approach for low-order speech modeling is presented. In this approach, the modeling process starts with a relatively high-order (full-order) autoregressive AR model obtained by some classical methods. The AR model is then reduced using the state projection method, operating in the state space. The model reduction yields a reduced-order autoregressive moving-average (ARMA) model that interestingly preserves the key properties of the original full-order model such as stability. Line spectral frequencies (LSF) and signal-to-noise ratio (SNR) behavior are also investigated. To illustrate the performance and the effectiveness of the proposed approach, some computer simulations are conducted on some practical speech segments.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123621450","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}
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