{"title":"Automated clustering of large data sets based on a topology representing graph","authors":"K. Tasdemir","doi":"10.1109/SIU.2009.5136521","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136521","url":null,"abstract":"A powerful method in analysis of large data sets where there are many natural clusters with varying statistics such as different sizes, shapes, density distribution, is the use of sel-forganizing maps (SOMs) [1]. However, further processing tools, such as visualization, interactive clustering, are often necessary to capture the clusters from the learned SOM knowledge. A recent visualization scheme, CONNvis [2], and interactive clustering from CONNvis, utilizes the data topology for SOM knowledge representation by using a weighted Delaunay graph, CONN. In this paper, an automated clustering scheme for SOMs, SOMcluster, which is a two-level clustering of CONN by the skills obtained in the interactive process, is proposed. It is shown that SOMcluster, which does not require the number of clusters a priori, is used successfully for automated segmentation of a remote sensing spectral image which has many clusters some of which were unidentified in previous works.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126817140","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}
{"title":"Channel output error (COE) for channel order estimation","authors":"S. Karakutuk, T. E. Tuncer","doi":"10.1109/SIU.2009.5136331","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136331","url":null,"abstract":"A new channel order estimation method is proposed for single-input multi-output (SIMO) systems. The method is based on a cost function which is constructed from the channel output error (COE). Proposed method uses the least-squares-smoothing (LSS) technique for channel estimation and Moore-Penrose pseudoinverse for the estimation of input. Channel outputs are obtained using the estimated channel coefficients and the input data sequence extracted from the estimated input data matrix via data unstacking. The cost function is calculated from the difference between the observed and the estimated channel output. It is proven that the cost function has a global minimum. The proposed method performs significantly better than the alternative algorithms. The proposed algorithm is more robust to changes in channel order and the number of channels, and gives exact result from limited number of samples in case of free noise.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126177203","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}
{"title":"Cell nuclei segmentation in pap smear test images","authors":"Asi Kale, S. Aksoy, S. Onder","doi":"10.1109/SIU.2009.5136479","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136479","url":null,"abstract":"Cervical cancer is a preventable disease and the dysplasia it causes can be scanned by using a pap smear test. It can be beneficial to develop a computer-assisted diagnosis system to make the pap smear test robust and widespread. The most fundamental part of such a system is the segmentation of nuclei and cytoplasm in cervical cell images. The aim of this study is to segment the nuclei in such images. First, markers on the nuclei are found by using mathematical morphology operations. Based on the obtained markers, marker-based watershed segmentation and balloon snake model are applied to find the nuclei contours in a data set consisting of cervical cell images. The data set is composed of six classes ranging according to the dysplasia degree of the cells. The results are evaluated according to the relative distance error measure, and the strengths and weakness of the methods are discussed.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127136206","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}
{"title":"Object segmentation in multi-view video via color, depth and motion cues","authors":"C. Çigla, Aydin Alatan","doi":"10.1109/SIU.2009.5136484","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136484","url":null,"abstract":"In the light of dense depth map estimation, motion estimation and object segmentation, the research on multi-view video (MVV) content has becoming increasingly popular due to its wide application areas in the near future. In this work, object segmentation problem is studied by additional cues due to depth and motion fields. Segmentation is achieved by modeling images as graphical models and performing popular Normalized Cuts method with some modifications. In the graphical models, each node is represented by a group of pixels, instead of individual pixels, which are obtained as a result of over-segmentation of the images. These over-segmented regions are also utilized in the dense depth map estimation step; in which 3D planar models are assigned for each of these sub-regions. Moreover, optical flow is estimated based on affine motion assumption for these regions. The links of the graphical models are weighted according to the depth, motion and color similarities of the pixel groups due to these regions. Once the links are obtained, segmentation is achieved by recursively bi-partitioning the graph via removing the weak links. Experiments indicate that the proposed framework achieves precise segmentation results for MVV sequences.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121557011","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}
{"title":"Automatic emotion recognition for facial expression animation from speech","authors":"E. Bozkurt, E. Erzin, Ç. Erdem, A. Erdem","doi":"10.1109/SIU.2009.5136564","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136564","url":null,"abstract":"We present a framework for automatically generating the facial expression animation of 3D talking heads using only the speech information. Our system is trained on the Berlin emotional speech dataset that is in German and includes seven emotions. We first parameterize the speech signal with prosody related features and spectral features. Then, we investigate two different classifier architectures for the emotion recognition: Gaussian mixture model (GMM) and hidden Markov model (HMM) based classifiers. In the experimental studies, we achieve an average emotion recognition rate of 83.42% using 5-fold stratified cross validation (SCV) method with a GMM classifier based on Mel frequency cepstral coefficients (MFCC) and dynamic MFCC features. Moreover, decision fusion of two GMM classifiers based on MFCC and line spectral frequency (LSF) features yields an average recognition rate of 85.30%. Also, a second-stage decision fusion of this result with a prosody-based HMM classifier further advances the average recognition rate up to 86.45%. Experimental results on automatic emotion recognition to drive facial expression animation synthesis are encouraging.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"246 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131828379","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}
{"title":"Blind channel equalization of multiple-input/single-output FIR systems for chaotic digital communication systems","authors":"G. Çetinel, C. Vural","doi":"10.1109/SIU.2009.5136423","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136423","url":null,"abstract":"Recently, Various blind channel equalization techniques for chaotic communication systems have been developed. However, in most of these studies communication channel is assumed to be single-input single-output (SISO) system. To the best of our knowledge, there is no study about blind equalization of multiple-input multiple-output (MIMO) channel case. In this study, an adaptive blind channel equalization algorithm for multiple-input single-output (MISO) chaotic communication system has been proposed. The channel is modelled as a MIMO finite impulse response (FIR) system and the equalizer is designed as a MISO FIR filter. The nonlinear predictability of a chaotic signal is exploited to derive the algorithm and the equalizer coefficients are updated by the proposed algorithm.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131829174","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}
{"title":"Joint network-channel coding with Repeat Accumulate codes for wireless relay networks","authors":"O. Ozdemir, A. O. Yılmaz","doi":"10.1109/SIU.2009.5136368","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136368","url":null,"abstract":"This paper presents two different repetition based joint network-channel coding schemes for a three-terminal communication system where two-users want to exchange information via a relay. The transmission is divided into three slots in time where the first and second slots are allocated to the RA (Repeat Accumulate) encoded data of the users. In the first scheme we propose, the relay decodes the received signals and transmits a bit-wise XOR-ed packet using RA coding in the third slot. In the second scheme, the relay demodulates the received signals without decoding and estimates the RA code symbols of each user, then transmits the XOR-ed symbol packet. Unlike the schemes in the literature, the introduced decoding algorithms do not require the relay to decode entire codeword without errors and remove the need for channel feedback without sacrificing the diversity order. The maximum-likelihood decision rule for transmission without channel coding is also derived.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"14 6 Pt 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131924895","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}
{"title":"CA-CFAR detection in spatially correlated K-distributed sea clutter","authors":"Aysin Cetin Hamurcu, A. Hizal","doi":"10.1109/SIU.2009.5136527","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136527","url":null,"abstract":"Radar detection of targets in sea clutter modelled by compound K-distribution is examined from a statistical detection viewpoint by Monte Carlo simulations. The detection performance of Cell Averaging Constant False Alarm Rate (CA-CFAR) is compared with the performance of fixed threshold detection. The performance evaluations are quantified by CFAR loss. Curves for CFAR loss to the spatial correlation and spikiness of sea clutter, number of cells of CA-CFAR processor and the number of non-coherently integrated pulses are presented.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131940478","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}
{"title":"Effect of filtering on processing of thermal lens fringes by single sideband modulation technique","authors":"A. Emir, Z. Saraç","doi":"10.1109/SIU.2009.5136321","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136321","url":null,"abstract":"This paper proposes the use of single sideband modulation technique with Gaussian and band pass filters for the analysis of the thermal lens fringe to obtain the map of the refractive index change.. Maps of the refractive index and phase change are achieved by using single side band modulation technique with Gaussian and band pass filters. Consequently, it is seen that single side band modulation technique with Gaussian filter shows more accurate results.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128373606","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}
{"title":"Linear separability analysis for stacked generalization architecture","authors":"M. Ozay, Fatoş T. Yarman Vural","doi":"10.1109/SIU.2009.5136569","DOIUrl":"https://doi.org/10.1109/SIU.2009.5136569","url":null,"abstract":"Stacked Generalization algorithm aims to increase the individual classification performances of the classifiers by combining the information obtained from various classifiers in a multilayer architecture by either linear or nonlinear techniques. Performance of the algorithm varies depending on the application domains and the space analyses that affect the classification performances could not be applied successfully. In the present work, linear and nonlinear transformations are investigated within and between each layer, and the linear separability property of the architecture is examined. In the conclusion of the analyses, it is observed that the data space can be separated linearly.","PeriodicalId":219938,"journal":{"name":"2009 IEEE 17th Signal Processing and Communications Applications Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123379381","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}