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2007 International Symposium on Intelligent Signal Processing and Communication Systems最新文献

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Real time auto-focus algorithm for eye gaze tracking system 眼注视跟踪系统的实时自动对焦算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445994
Ruian Liu, Shijiu Jin, Xiaorong Wu
{"title":"Real time auto-focus algorithm for eye gaze tracking system","authors":"Ruian Liu, Shijiu Jin, Xiaorong Wu","doi":"10.1109/ISPACS.2007.4445994","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445994","url":null,"abstract":"An eye tracking method and an automatic focusing algorithm is proposed to acquire clear eye images in the eye- gaze tracking system. The aperture of CCD lens is controlled to adapt the system to external lighting circumstances based of the average brightness values of the processed images. A SMD operator is used for focusing roughly and quickly in a large scale for obtaining the eye glints to control a pan-tilt unit for eye aiming and eye tracking, and regulating the focus of the lens. The FSWM operator is applied in the determined window to focus automatically for clear images. If the pupil can be extracted from the image, the average gradient of the edge points can be used for real-time focusing. Experiments show that this system can track the eye and acquire clear eye images in real-time.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123947901","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: 4
A virtual view genetation method for free-viewpoint video system 自由视点视频系统的虚拟视点生成方法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445847
Zhebin Zhang, Longshe Huo, Chao Xia, Wei Zeng, Wen Gao
{"title":"A virtual view genetation method for free-viewpoint video system","authors":"Zhebin Zhang, Longshe Huo, Chao Xia, Wei Zeng, Wen Gao","doi":"10.1109/ISPACS.2007.4445847","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445847","url":null,"abstract":"Generating virtual views is one of the crucial problems for a free-viewpoint video system. In this paper, we solve the problem by using a method based on the technique of view morphing, and construct a multi-camera based experimental free-viewpoint video platform to validate its feasibility. This method requires no setting up of dense cameras, therefore the system is easy to be established and controlled in practice, and the mount of data for processing and transmitting can also be reduced. Experimental results show that the effect of this method can satisfy the requirement of view generation for the system.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124220971","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
Finite wordlength design for IIR digital filters based on the modified least-square criterion in the frequency domain 基于改进频域最小二乘准则的IIR数字滤波器有限字长设计
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445924
M. Nakamoto, T. Yoshiya, T. Hinamoto
{"title":"Finite wordlength design for IIR digital filters based on the modified least-square criterion in the frequency domain","authors":"M. Nakamoto, T. Yoshiya, T. Hinamoto","doi":"10.1109/ISPACS.2007.4445924","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445924","url":null,"abstract":"The filter design problem is often formulated in real space (or complex space) whose word length is infinite. However, when implementing a filter in hardware, the frequency characteristic can be degraded caused by finite word-length effect. In this paper, we formulate the filter design problem based on modified least square criterion in the frequency domain. Here the problem is expressed as quadratic form and we optimize the filter coefficients by using branch and bound method in discrete space. In the branch and bound method, we calculate the relaxation solution based on the Lagrange multiplier method and search in the domain in which good possible solutions exist. In this method, the stable solutions whose poles are all inside the unit circle are just acceptable, so the stability of the filter can be guaranteed. Finally, numerical example is given to illustrate the utility of the proposed method.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125395139","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
Design of a new portable telemedicine monitoring equipment based on NIOS II 基于NIOS II的新型便携式远程医疗监测设备的设计
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445824
Chaodong Ling, Huafeng Hong, Rong Liu, Jiaxian Wang
{"title":"Design of a new portable telemedicine monitoring equipment based on NIOS II","authors":"Chaodong Ling, Huafeng Hong, Rong Liu, Jiaxian Wang","doi":"10.1109/ISPACS.2007.4445824","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445824","url":null,"abstract":"A solution for end-user of the portable telemedicine monitoring equipment has been proposed in this paper. The hardware design scheme adopts SOPC technology based on NIOS II processor. The system modules are implemented on Quartus II V6.0 and have been validated on Altera 1C20 development kit. This paper focuses on the development process of hardware platform. The experimental result indicates that the monitoring system can realize data acquisition, display, storage and transfer functions directly and accurately.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125954328","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 new semi-blind constant modulus equalization algorithm 一种新的半盲恒模均衡算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445842
Qing-Jia Chen, Qi-hui Wu, Jin-Long Wang
{"title":"A new semi-blind constant modulus equalization algorithm","authors":"Qing-Jia Chen, Qi-hui Wu, Jin-Long Wang","doi":"10.1109/ISPACS.2007.4445842","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445842","url":null,"abstract":"For the sake of enhancing stability of least squares constrant modulus equalization algorithm( LSCMA), combining recursive least-squares (RLS) and using robust estimation (RE) from Application Maths, the paper puts forward an new sort of semi-blind constant modulus equalization algorithm that names SB-MRLS-LSCMA.The simulation indicates that the algorithm improves the performance of convergence and stability of the equalizer comparing to traditional LSCMA and several other semi-blind algorithm. And the algorithm can be good for restraining multi-pathway and Rayleigh fading.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130152386","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
A rapid antenna selection for MIMO-diversity systems mimo分集系统的快速天线选择
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445949
Honggang Duan, Feng Liu, Ming Li, Mengran Xu
{"title":"A rapid antenna selection for MIMO-diversity systems","authors":"Honggang Duan, Feng Liu, Ming Li, Mengran Xu","doi":"10.1109/ISPACS.2007.4445949","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445949","url":null,"abstract":"The technology of antenna selection for MIMO diversity systems can keep most of the diversity gain, yet needs no more RF chains. This paper develops a rapid antenna selection method for multiple-input multiple-output (MIMO) diversity systems which use maximum ratio transmit (MRT) at the transmitter and Maximum Ratio Combine (MRC) at the receiver. In this method, at each step, a new antenna is added to the selected antenna subset to make sure that they can provide the largest SNR gain. Comparing to the optimum antenna selection, this method reduces the number of antenna subsets to be searched and the computation for each step, and thus, reduces the complexity. Computer simulations show that the BER, capacity and SNR gain performances of our algorithm are nearly the same as the optimum one which needs a full search of all the possible antenna subsets.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128878226","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
Chaotic spread-spectrum sequences using chaotic quantization 使用混沌量化的混沌扩频序列
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445818
Jian Zhang, Jian Cheng, Guang-xia Li
{"title":"Chaotic spread-spectrum sequences using chaotic quantization","authors":"Jian Zhang, Jian Cheng, Guang-xia Li","doi":"10.1109/ISPACS.2007.4445818","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445818","url":null,"abstract":"Chaos is widely used in spread-spectrum communication research work due to its pseudorandom property and high sensitivity to initial value. But when applying chaos to practical spread-spectrum communication, there exists the finite precision problem because of the precision limitation of hardware, which leads chaos to short period. A new method of chaotic quantization is presented in this paper aiming to get better properties as well as overcome the finite precision problem to some extent. And some analysis and simulation result are given to show the advantage of this method to the previous solving methods such as multilevel quantization.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121948045","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: 4
Improved methods for noise spectral estimation and adaptive spectral gain control in noise spectral suppressor 改进了噪声谱估计和自适应增益控制方法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445812
K. Nakayama, H. Suzuki, A. Hirano
{"title":"Improved methods for noise spectral estimation and adaptive spectral gain control in noise spectral suppressor","authors":"K. Nakayama, H. Suzuki, A. Hirano","doi":"10.1109/ISPACS.2007.4445812","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445812","url":null,"abstract":"In this paper, new approaches to noise spectrum estimation and spectral gain control are proposed for noise spectral suppressors. First, the speech absent frames are detected by using spectral entropy. In the speech absent frames, a weighting factor used in estimating the noise spectrum is modified so as to emphasize effect of the noisy speech signal. Next, a spectral gain is more reduced by multiplying a factor in order to suppress effects of the noise in the speech absent frames. Furthermore, in the speech present frames, in order to reduce signal distortion, the spectral gain is controlled to be unity based on an SNR calculated by using a ridgeline spectrum. Finally, the original noisy speech is added to the estimated speech in some ratio. This ratio is controlled by the long term averaged SNR of the estimated noise and the noisy speech. Computer simulations by using speech signals, the white noise, the car noise and the bubble noise, which are available in public, have been carried out for the conventional methods and the proposed method. The proposed method can improve a segmental SNR and speech quality compared to the conventional methods. Especially, it is useful for the bubble noise.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"57 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122321406","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
Fast algorithm for antenna selection in MIMO systems based on minimum error rate 基于最小错误率的MIMO系统天线快速选择算法
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4445936
Xie Zhibin, Wang Jinkuan, Wang Yun, Meng Yan
{"title":"Fast algorithm for antenna selection in MIMO systems based on minimum error rate","authors":"Xie Zhibin, Wang Jinkuan, Wang Yun, Meng Yan","doi":"10.1109/ISPACS.2007.4445936","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4445936","url":null,"abstract":"In this paper, a fast antenna selection algorithm is proposed in wireless multiple input multiple output systems. The algorithm makes use of an efficient recursive QR factorization for selecting the sub-optimal antenna subset in terms of minimum error rate. The proposed algorithm decreases the computational complexity greatly, and improves the performance of the linear receiver. Simulation results demonstrate that the proposed antenna selection algorithm achieves excellent performance under uncorrelated and correlated channel.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126823379","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: 8
Beamforming of coherent signals for weighed two concentric ring arrays 加权两个同心圆阵列相干信号的波束形成
2007 International Symposium on Intelligent Signal Processing and Communication Systems Pub Date : 2007-11-01 DOI: 10.1109/ISPACS.2007.4446021
Xi Ju-lan, He Zi-shu
{"title":"Beamforming of coherent signals for weighed two concentric ring arrays","authors":"Xi Ju-lan, He Zi-shu","doi":"10.1109/ISPACS.2007.4446021","DOIUrl":"https://doi.org/10.1109/ISPACS.2007.4446021","url":null,"abstract":"The Davies transformation is a method to transform the steering vector of a uniform circular array (UCA) to one with Vandermonde form, which allows techniques such as spatial smoothing in a correlated signal environment. However, the Davies transformation, applied to the beamforming of coherent signals, will introduce strong frequency-dependent noise warping. This paper proposes a method of weighing virtual array of two concentric ring arrays to avoid such problem. Such technique is able to improve the output SNR. The effectiveness of the method is illustrated through a number of numerical examples.","PeriodicalId":220276,"journal":{"name":"2007 International Symposium on Intelligent Signal Processing and Communication Systems","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127761991","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
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