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[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis最新文献

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Limited angle tomography via multiresolution analysis and oversampling 通过多分辨率分析和过采样的有限角度层析成像
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274199
T. Olson
{"title":"Limited angle tomography via multiresolution analysis and oversampling","authors":"T. Olson","doi":"10.1109/TFTSA.1992.274199","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274199","url":null,"abstract":"A method is presented for reconstructing a function from its line integrals. This problem arises in imaging whenever the physical constraints of the system prohibit the gathering of the line integrals over the angles - pi /2< theta <0. The first portion of the algorithm decomposes the limited angle operator L into a tensor product structure that allows an efficient calculation of its singular value decomposition. The second portion of the algorithm uses multiresolution analysis in order to mollify the problem, which is known to be extremely ill conditioned. It is thought that these methods may lead to a more stable algorithm for limited angle reconstruction.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132461000","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
The design of compactly supported orthonormal wavelets with integer scaling factors 具有整数标度因子的紧支持正交小波的设计
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274173
M. S. Lazar, L. Bruton
{"title":"The design of compactly supported orthonormal wavelets with integer scaling factors","authors":"M. S. Lazar, L. Bruton","doi":"10.1109/TFTSA.1992.274173","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274173","url":null,"abstract":"It has been shown that discrete-time orthonormal wavelet decompositions are related to lossless perfect reconstruction (PR) multirate filter banks except that such filters are not generally designed with wavelet regularity considerations in mind. The authors present a method, based on the design of M-band PR filters, to generate orthonormal wavelets with arbitrary integer scaling factor M, such that the wavelets are regular and the corresponding PR filters have good stop- and pass-band responses. Applications for such filters include the analysis of signals with arbitrary scaling, such as fractals.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121291703","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
Rotate adaptive filter and its application in the separation of overlapped periodic signals 旋转自适应滤波器及其在重叠周期信号分离中的应用
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274141
HoegzLi Li
{"title":"Rotate adaptive filter and its application in the separation of overlapped periodic signals","authors":"HoegzLi Li","doi":"10.1109/TFTSA.1992.274141","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274141","url":null,"abstract":"A rotation adaptive filter (RAF) with a special structure is presented. Using its outputs as reference signals, this filter can be applied to separate overlapped periodic signals. Experiments show that periodic signals are fanned out with little distortion. The ability of this filter to cancel interference is demonstrated. A distinctive algorithm based on the RAF structure is used, and an algebraic theory of separation of periodic signals is introduced.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126974776","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
Consistent kth-order time-frequency representations for (almost) cyclostationary signals (几乎)周期平稳信号的一致的k阶时频表示
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274220
G.B. Gianakis, A. V. Dandawate
{"title":"Consistent kth-order time-frequency representations for (almost) cyclostationary signals","authors":"G.B. Gianakis, A. V. Dandawate","doi":"10.1109/TFTSA.1992.274220","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274220","url":null,"abstract":"Limitations of existing kth-order time-frequency representations (TFR) are discussed. It is emphasized that consistent estimation of TFRs is possible if the underlying nonstationarity is structured. The role of consistent and asymptotically normal cyclic-statistics in estimating the TFRs of cyclostationarity processes is elucidated, and relationships between cyclic-statistics, ambiguity functions, and Wigner-Ville distributions are discussed. Noise immunity of cyclic-statistics is shown. Conditions for consistent estimation of statistics of a class of nonstationary processes are given without assuming cyclostationarity.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131081108","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
A novel spectral factorization method and its application in the design of filter banks and wavelets 一种新的谱分解方法及其在滤波器组和小波设计中的应用
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274178
T.Q. Nguyen
{"title":"A novel spectral factorization method and its application in the design of filter banks and wavelets","authors":"T.Q. Nguyen","doi":"10.1109/TFTSA.1992.274178","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274178","url":null,"abstract":"One of the difficulties encountered in spectral factorization is achieving computational accuracy when computing a spectral factor whose zeros are on the unit circle and/or the order is high. An iterative approach is presented for computing the spectral factor accurately. It is shown that the new method performs well and can be used in the design of filter banks satisfying perfect reconstruction and orthonormal compactly supported wavelets. Design examples are included.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"281 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126000642","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
Application of eigenanalysis and tomography to time-frequency representations 特征分析和断层扫描在时频表示中的应用
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274239
R.A. Altes
{"title":"Application of eigenanalysis and tomography to time-frequency representations","authors":"R.A. Altes","doi":"10.1109/TFTSA.1992.274239","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274239","url":null,"abstract":"The author addresses the question of how to obtain the high accuracy inherent in Wigner representations while avoiding the artifacts caused by cross products between multiple signal components. One approach involves separation of the components of a multicomponent signal by means of eigenanalysis. Various distortions are deliberately introduced by differentiation, smoothing, and the use of time varying gains so as to increase the rank of the signal autocovariance matrix. Separate Wigner distributions of the principal eigenvectors of this matrix are weighted by the eigenvalues and added. The filtering/synthesis problem is automatically solved, since different eigenvectors approximate individual signal components. Another approach is to form inner products of the signal with time functions that have line-like Wigner distributions, thus constructing projection samples that can be used to obtain the signal distribution by means of Radon transform inversion. The tomographic technique can completely eliminate cross-product effects with little loss of accuracy.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123169161","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
Famlet, to be or not to be a wavelet? 小波，做还是不做小波?
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274170
U.K. Laine
{"title":"Famlet, to be or not to be a wavelet?","authors":"U.K. Laine","doi":"10.1109/TFTSA.1992.274170","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274170","url":null,"abstract":"A class of orthogonal time domain functions called famlets is introduced. Famlets are produced from their frequency domain representatives by using the inverse Fourier transform. The basic theory behind famlets and the famlet transform associated with them is formulated, and their usage in nonuniform resolution spectrum analysis is described. The similarities and dissimilarities of famlets and wavelets are discussed.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123312269","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: 19
Unsupervised multiscale segmentation of multispectral imagery 多光谱图像的无监督多尺度分割
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274120
R. A. Fernandes, M. Jernigan
{"title":"Unsupervised multiscale segmentation of multispectral imagery","authors":"R. A. Fernandes, M. Jernigan","doi":"10.1109/TFTSA.1992.274120","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274120","url":null,"abstract":"A method for segmenting high resolution multispectral forestry images acquired from aircraft is described. This method makes use of a hierarchical smoothing network to aggregate pixels. The aggregation process is guided by a nonorthogonal multiscale spatial/spatial frequency texture representation. Texture and spectral similarity measures between and within network levels are used to inhibit smoothing between land cover classes at five different resolutions. Segmentation performance is evaluated in terms of classification accuracy using independent and dependent samples for labeling emergent classes. The hypothesis that the accuracy of the network as it approaches steady state drops when interlayer connections are eliminated or when the texture information is removed is supported. The hypothesis that the segmentation network is more accurate than fuzzy clustering and unsupervised segmentation is verified.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"227 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120923820","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
Spectral estimation from subbands 子波段光谱估计
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274232
S. Rao, W. Pearlman
{"title":"Spectral estimation from subbands","authors":"S. Rao, W. Pearlman","doi":"10.1109/TFTSA.1992.274232","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274232","url":null,"abstract":"The results of previous work by the authors (see Conf. on Inform. Sci. and Syst., 1992) are used to prove that subband differential pulse-code modulation (DPCM) provides a coding gain over full-band DPCM for finite orders of prediction. The equivalence of linear prediction and autoregressive (AR) modeling equations are used to estimate source spectra from subbands. Subband decomposition of a source results in a whitening of the composite subband spectrum. This implies that for any stationary source, a p/sup th/-order prediction error filter (PEF) can be found that is better than the p/sup th/ PEF obtained by solving the Yule-Walker equations resulting from full-band data. The existence of such a superoptimal PEF is demonstrated, and a method to optimally allocate a prediction order p/sub m/ to the m/sup th/ subband such that the sum of the p/sub m/'s from m=1 to M equals p, where p is the full-band order of prediction and M is the number of subbands, is proposed.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126572073","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: 12
An analysis/synthesis model for the human visual system based on subspace decomposition and multirate filter bank theory 基于子空间分解和多速率滤波器组理论的人类视觉系统分析/综合模型
[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis Pub Date : 1992-10-04 DOI: 10.1109/TFTSA.1992.274117
Lina Karam
{"title":"An analysis/synthesis model for the human visual system based on subspace decomposition and multirate filter bank theory","authors":"Lina Karam","doi":"10.1109/TFTSA.1992.274117","DOIUrl":"https://doi.org/10.1109/TFTSA.1992.274117","url":null,"abstract":"A two-stage model of the human visual system (HVS) comprised of low-level (analysis) and a high-level (synthesis) processing stages is presented. The processing done at the low-level stage is described using two approaches, one based on a subspace decomposition and the other on a multirate filter bank. These two models simultaneously provide the high-level processing stage with different perspectives or representations of the retinal image. Based on these representations, the high-level processing stage attempts to perceive the encoded visual information. A single framework, which models the hypercolumn-based structure in the striate cortex and combines the different retinal image representations, is proposed. The model resolves differences among previously proposed HVS models, and suggests the development of image processing algorithms which combine and exploit the information provided by different transformations or representations of the input image.<<ETX>>","PeriodicalId":105228,"journal":{"name":"[1992] Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134160566","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: 7
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