Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226967
A. Stoica, C. Vertan, C. Fernandez-Maloigne
The subjective evaluation of the color image quality came into focus because of the failure"" of the objective criteria to offers good results in terms of human perception. We show that objective and subjective evaluation can lead to significant different conclusions.""
{"title":"Objective and subjective color image quality evaluation for JPEG 2000 compressed images","authors":"A. Stoica, C. Vertan, C. Fernandez-Maloigne","doi":"10.1109/SCS.2003.1226967","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226967","url":null,"abstract":"The subjective evaluation of the color image quality came into focus because of the failure\"\" of the objective criteria to offers good results in terms of human perception. We show that objective and subjective evaluation can lead to significant different conclusions.\"\"","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133382173","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227004
I. Ciocoiu, B. Valmar
We present a comparative analysis of the recognition performances of 2 different preprocessing techniques for face recognition application. The specific methods are projection-combined principal component analysis ((PC)2A) and eigenhills, which are compared against standard eigenface method. Recognition performances are computed using different distance measures and number of training images on the Olivetti database.
{"title":"A comparison between two preprocessing techniques in PCA-based face recognition","authors":"I. Ciocoiu, B. Valmar","doi":"10.1109/SCS.2003.1227004","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227004","url":null,"abstract":"We present a comparative analysis of the recognition performances of 2 different preprocessing techniques for face recognition application. The specific methods are projection-combined principal component analysis ((PC)2A) and eigenhills, which are compared against standard eigenface method. Recognition performances are computed using different distance measures and number of training images on the Olivetti database.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132268134","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227101
D. Tarniceriu, S. Mereuta
The problem of subband coding with crossband prediction of a wide sense stationary Gaussian source is analyzed. The analysis is performed both in case of high rate encoding, i.e., the case of small distortion and in the case when an additive noise model for the quantizer is adopted. In both cases the noncausal and causal prediction filters are derived. The prediction filters results of infinite impulse response, but due to the fast decay of their coefficients, they can be efficiently implemented.
{"title":"Results on quadrature mirror filters with crossband prediction","authors":"D. Tarniceriu, S. Mereuta","doi":"10.1109/SCS.2003.1227101","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227101","url":null,"abstract":"The problem of subband coding with crossband prediction of a wide sense stationary Gaussian source is analyzed. The analysis is performed both in case of high rate encoding, i.e., the case of small distortion and in the case when an additive noise model for the quantizer is adopted. In both cases the noncausal and causal prediction filters are derived. The prediction filters results of infinite impulse response, but due to the fast decay of their coefficients, they can be efficiently implemented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133179799","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226936
A. A. Dmitriev
The problem of perfect synchronization of pseudochaotic systems with finite number of states is considered in the presence of noise in the channel. After the synchronization is established, the drive and the response systems can be disconnected, but the systems themselves remain synchronized. An algorithm for such synchronization is proposed. Investigation of the synchronization robustness as a function of noise level in the channel is presented.
{"title":"Chaotic synchronization in communication systems with finite number of states","authors":"A. A. Dmitriev","doi":"10.1109/SCS.2003.1226936","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226936","url":null,"abstract":"The problem of perfect synchronization of pseudochaotic systems with finite number of states is considered in the presence of noise in the channel. After the synchronization is established, the drive and the response systems can be disconnected, but the systems themselves remain synchronized. An algorithm for such synchronization is proposed. Investigation of the synchronization robustness as a function of noise level in the channel is presented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121889110","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227085
M. Zbancioc, M. Costin
Linear Predictive Coding (LPC), powerful speech analysis technique, is very useful for encoding speech at a low bit rate and provides extremely accurate estimates of speech parameters - based on the assumption that speech signal is produced by a buzzer at the end of the tube (the glottis produces the buzz, characterized by its intensity and frequency, and the vocal tract forms the tube, characterized by resonance frequencies (formants) according to Calliope(1989), is very efficient for the vocalic areas. The model is less efficient for transient, unvowel or not stationary regions according to R. Lawrence and B. Hwang Juang (1993). A Radial Basis Function network is able to recognize in a satisfying percent a set of phonemes pronounced by different speakers, using LPC sets as input.
{"title":"Using neural networks and LPCC to improve speech recognition","authors":"M. Zbancioc, M. Costin","doi":"10.1109/SCS.2003.1227085","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227085","url":null,"abstract":"Linear Predictive Coding (LPC), powerful speech analysis technique, is very useful for encoding speech at a low bit rate and provides extremely accurate estimates of speech parameters - based on the assumption that speech signal is produced by a buzzer at the end of the tube (the glottis produces the buzz, characterized by its intensity and frequency, and the vocal tract forms the tube, characterized by resonance frequencies (formants) according to Calliope(1989), is very efficient for the vocalic areas. The model is less efficient for transient, unvowel or not stationary regions according to R. Lawrence and B. Hwang Juang (1993). A Radial Basis Function network is able to recognize in a satisfying percent a set of phonemes pronounced by different speakers, using LPC sets as input.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124799697","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227098
L. Stanciu, T. Bitoiu-Silisteanu
This paper presents some possibilities of digital signal processing for the loudspeaker measured impulse response. The linear distortion of a loudspeaker can be described using cumulative-decay spectrum (CDS) and energy-time curves (ETC). Some applications are presented. The implications on CDS and ETC of digital crossover alignments are analyzed. We consider a non minimum phase loudspeaker impulse response and the phase distortion is analyzed using digital equalization networks. A two-stage digital equalizer is presented.
{"title":"Signal processing for loudspeaker evaluation and equalization","authors":"L. Stanciu, T. Bitoiu-Silisteanu","doi":"10.1109/SCS.2003.1227098","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227098","url":null,"abstract":"This paper presents some possibilities of digital signal processing for the loudspeaker measured impulse response. The linear distortion of a loudspeaker can be described using cumulative-decay spectrum (CDS) and energy-time curves (ETC). Some applications are presented. The implications on CDS and ETC of digital crossover alignments are analyzed. We consider a non minimum phase loudspeaker impulse response and the phase distortion is analyzed using digital equalization networks. A two-stage digital equalizer is presented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132487511","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227072
P. Meher, T. Srikanthan
This paper presents a fully pipelined high-throughput, low-latency, multiplier-less architecture for VLSI implementation of the discrete Hartley transform (DHT). The structure is highly modular and scalable to accommodate higher transformation lengths, and so also it is suitable for low-hardware implementation when throughput requirement is not very high. Apart from that, the proposed structure offers significantly better speed performance and involves considerably less hardware compared with the existing structures.
{"title":"A scalable and multiplier-less fully-pipelined architecture for VLSI implemetation of discrete Hartley transform [implemetation read implementation]","authors":"P. Meher, T. Srikanthan","doi":"10.1109/SCS.2003.1227072","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227072","url":null,"abstract":"This paper presents a fully pipelined high-throughput, low-latency, multiplier-less architecture for VLSI implementation of the discrete Hartley transform (DHT). The structure is highly modular and scalable to accommodate higher transformation lengths, and so also it is suitable for low-hardware implementation when throughput requirement is not very high. Apart from that, the proposed structure offers significantly better speed performance and involves considerably less hardware compared with the existing structures.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131734150","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226983
K. Edelmoser, F. Himmelstoss
In case of medium voltage (several tenth up to several hundred volts) solar inverter applications of DC-DC converter for voltage level adaptation is required. To raise the over all efficiency of the inverter a spited power stage concept was chosen. The insertion of a further optimization topic leads to a significant improve of the system efficiency. In our model two coupled converter stages are used. Therefore, due to the usage of synergy effects only two additional power electronic components (a diode and a power switch) are necessary for the system extension. In the current paper the development of a 120V-240V DC (input) to 230V AC(output)/1 kW inverter is derived, realization hints are given and the efficiency of the complete converter is compared to a conventional solution. Further optimization aspects and improvements are discussed.
{"title":"Improved 1kW solar inverter with wide input voltage range","authors":"K. Edelmoser, F. Himmelstoss","doi":"10.1109/SCS.2003.1226983","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226983","url":null,"abstract":"In case of medium voltage (several tenth up to several hundred volts) solar inverter applications of DC-DC converter for voltage level adaptation is required. To raise the over all efficiency of the inverter a spited power stage concept was chosen. The insertion of a further optimization topic leads to a significant improve of the system efficiency. In our model two coupled converter stages are used. Therefore, due to the usage of synergy effects only two additional power electronic components (a diode and a power switch) are necessary for the system extension. In the current paper the development of a 120V-240V DC (input) to 230V AC(output)/1 kW inverter is derived, realization hints are given and the efficiency of the complete converter is compared to a conventional solution. Further optimization aspects and improvements are discussed.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125400791","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227084
V. Maiorescu, M. Serban, A. Lazar
In this paper, the discrimination of mental tasks by means of the EEG signals is transformed into classification of a system that has as the output the EEG signals. A feedforward neural network is trained to classify six-channel EEG data into one of five classes which correspond to the selected tasks. A simpler topology of the neural network and a reduction of the dimension of layers are achieved due to an autoregressive (AR) model used to represent EEG signals. The network performances were analyzed based on classification rate for the cross-validation set.
{"title":"Classification of EEG signals represented by AR models for cognitive tasks - a neural network based method","authors":"V. Maiorescu, M. Serban, A. Lazar","doi":"10.1109/SCS.2003.1227084","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227084","url":null,"abstract":"In this paper, the discrimination of mental tasks by means of the EEG signals is transformed into classification of a system that has as the output the EEG signals. A feedforward neural network is trained to classify six-channel EEG data into one of five classes which correspond to the selected tasks. A simpler topology of the neural network and a reduction of the dimension of layers are achieved due to an autoregressive (AR) model used to represent EEG signals. The network performances were analyzed based on classification rate for the cross-validation set.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123381790","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227107
G. Sirbu, I. Bogdan
The coverage area and the number of users of mobile communication networks are in a continuous and fast growing, while the allocated frequency spectrum remains unchanged. New efficient management schemes have to be deployed in order to maintain a good grade of service. This paper deals with a software package meant to evaluate by simulation the blocking probability in a cellular system induced by a channel allocation scheme and, thus, to select its parameters in accordance with the network architecture and the traffic distribution on its coverage area.
{"title":"Analysis of channel allocation schemes for cellular mobile communication networks","authors":"G. Sirbu, I. Bogdan","doi":"10.1109/SCS.2003.1227107","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227107","url":null,"abstract":"The coverage area and the number of users of mobile communication networks are in a continuous and fast growing, while the allocated frequency spectrum remains unchanged. New efficient management schemes have to be deployed in order to maintain a good grade of service. This paper deals with a software package meant to evaluate by simulation the blocking probability in a cellular system induced by a channel allocation scheme and, thus, to select its parameters in accordance with the network architecture and the traffic distribution on its coverage area.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131118876","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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