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1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)最新文献

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Packet loss concealment in baseline JPEG coded images 基线JPEG编码图像中的丢包隐藏
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685686
S. Shirani, F. Kossentini, R. Ward
{"title":"Packet loss concealment in baseline JPEG coded images","authors":"S. Shirani, F. Kossentini, R. Ward","doi":"10.1109/ADFSP.1998.685686","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685686","url":null,"abstract":"Loss of coded data can affect a JPEG decoded image to a large extent, making concealment of errors caused by data loss an important issue. Reconstruction of JPEG coded images in an error-prone channel environment is investigated in this paper. First a method for estimating the missing DC coefficients of a JPEG coded image which is required for decoding the compressed image, is suggested and evaluated. As the effects of errors in estimating the missing DC value will appear as stripes across the image, a post-processing technique for removing such stripes is then developed. Finally the missing data is reconstructed by exploiting the correlation between adjacent blocks. A novel reconstruction technique which has a good performance in reconstruction of edges is proposed. A key contribution of our work is that, unlike in previously published reconstruction algorithms, differential encoding of the DC coefficients is assumed. Simulation results indicate that the performance of our algorithm is very good, even when many packets are lost during transmission of the JPEG coded image.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131462827","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
Nested transformation of variables for designing multidimensional filter banks 多维滤波器组设计中变量的嵌套变换
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685717
D. Tay
{"title":"Nested transformation of variables for designing multidimensional filter banks","authors":"D. Tay","doi":"10.1109/ADFSP.1998.685717","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685717","url":null,"abstract":"The transformation of variables has been shown previously to be a flexible technique for designing multidimensional multirate filter banks. The flexibility is due to the relative ease in designing the transformation function to shape the characteristics of the resulting subband filters. A new approach is presented where a nested transformation is used. The design of 2-D quincunx lattice and 3-D face centered orthorhombic (FCO) lattice filter banks is considered. Causal and stable IIR subband filters are possible and the impulse response supports are in the first-quadrant and first-octant for the 2-D and 3-D cases respectively.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122395843","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
Digital filter design using genetic algorithm 采用遗传算法设计数字滤波器
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685690
A. Lee, M. Ahmadi, G. Jullien, W. Miller, R. S. Lashkari
{"title":"Digital filter design using genetic algorithm","authors":"A. Lee, M. Ahmadi, G. Jullien, W. Miller, R. S. Lashkari","doi":"10.1109/ADFSP.1998.685690","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685690","url":null,"abstract":"The authors present an algorithm for designing 1-D FIR filters using genetic algorithms. In addition, the authors examine the usefulness of various error norms such as I/sub 2/ and I/sub /spl infin// (minimax), and their impact on the convergence rate and the optimal result. The authors also present the application of various coding schemes applied to the filter coefficients and their effect in obtaining optimum filters. Examples of 1-D FIR filters are given using the above methodologies to illustrate the usefulness and utilities of the proposed techniques.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124201481","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: 61
Adaptive Kalman smoothing of AR signals disturbed by impulses and colored noise 受脉冲和彩色噪声干扰的AR信号的自适应卡尔曼平滑
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685698
G. Doblinger
{"title":"Adaptive Kalman smoothing of AR signals disturbed by impulses and colored noise","authors":"G. Doblinger","doi":"10.1109/ADFSP.1998.685698","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685698","url":null,"abstract":"In this paper, we describe a new and computationally efficient adaptive system for the enhancement of autoregressive (AR) signals which are disturbed by additive white or colored noise and impulsive noise. The system is comprised of an adaptive Kalman filter operating as a fixed lag smoother and a subsystem for AR parameter estimation. A superior performance is achieved by implementing a feedback loop between the Kalman filter output and the parameter estimation. Accordingly, the AR parameters are obtained from the enhanced signal and the influence of the disturbing noise on the parameter estimation is damped down. Impulsive noise is suppressed by an outlier detection scheme and by freezing the Kalman filter update during presence of impulses. The subsystem for AR parameter estimation can operate in a block processing mode or on a sample per sample basis. Another advantage of the adaptive Kalman filter is its tracking capability for short-time stationary signals.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122884042","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
Implementation of adaptive processing in integrated active-passive sonars with multi-dimensional arrays 多维阵列集成主-被动声纳自适应处理的实现
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685696
S. Stergiopoulos, A.C. Dhanantwari
{"title":"Implementation of adaptive processing in integrated active-passive sonars with multi-dimensional arrays","authors":"S. Stergiopoulos, A.C. Dhanantwari","doi":"10.1109/ADFSP.1998.685696","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685696","url":null,"abstract":"The investigation reported includes a multi-dimensional array sonar for underwater robotics operations, such as mine hunting. The various aspects of robotics arrangements for the ROV are discussed in association with the sonar performance characteristics provided by the integrated functionality of the multi-dimensional array sonar including an adaptive beamformer. The proposed adaptive processing concept has been implemented in an integrated active-passive real-time sonar deploying a cylindrical array. Real data results from the adaptive and conventional beamforming outputs of the cylindrical array sonar system demonstrate the superior performance of the adaptive beamformer in suppressing the reverberation and cluttering effects in active sonar applications. Moreover, for passive sonar applications, the adaptive processing provides substantially improved the angular resolution performance as compared with that of the conventional beamformer. Both these two performance improvements for a cylindrical array sonar are of particular importance for mine hunting operations.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125031063","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
Lowpass filters realizable as coupled allpasses: design via a new flat delay filter 低通滤波器可实现为耦合全通:设计通过一个新的平坦延迟滤波器
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685711
I. Selesnick
{"title":"Lowpass filters realizable as coupled allpasses: design via a new flat delay filter","authors":"I. Selesnick","doi":"10.1109/ADFSP.1998.685711","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685711","url":null,"abstract":"This paper describes a new class of maximally flat lowpass recursive digital filters. The filters are realizable as a parallel sum of two allpass filters, a structure for which low-complexity low-noise implementations exist. Note that, with the classical Butterworth filter of degree N, which can be retrieved as a special case, it is not possible to adjust the delay (or phase-linearity). However, with the more, general class of filters described in this paper, the adjustment of the delay becomes possible, and the trade-off between the delay and the phase-linearity can be chosen. The construction of these lowpass filters depends upon a new maximally flat delay allpole filter, for which the degrees of flatness at /spl omega/=0 and /spl omega/=/spl pi/ are not necessarily equal. For the coefficients of this flat delay filter, an explicit solution is introduced, which also specializes to a previously known result.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130981210","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
Recursive implementation of the DCT-IV and DST-IV 递归实现DCT-IV和DST-IV
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685705
S. Kidambi
{"title":"Recursive implementation of the DCT-IV and DST-IV","authors":"S. Kidambi","doi":"10.1109/ADFSP.1998.685705","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685705","url":null,"abstract":"We present recursive implementation for the computation of the discrete cosine transform (DCT-IV) and discrete sine transform (DST-IV). We also present a recursive structure that can be used to simultaneously compute the DCT-IV and DST-IV. We use the Clenshaw's recurrence formula (CRF) to obtain recursive structures for the DCT-IV and DST-IV. All these structures are easily amenable to VLSI implementation using modular structures.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"98 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113997733","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 linear-phase recursive digital filters by optimization 线性相位递归数字滤波器的优化设计
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685701
S. Saab, A. Antoniou, W. Lu
{"title":"Design of linear-phase recursive digital filters by optimization","authors":"S. Saab, A. Antoniou, W. Lu","doi":"10.1109/ADFSP.1998.685701","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685701","url":null,"abstract":"An optimization method for the design of constant delay recursive digital filters is presented. The stability problem associated with current recursive-filter optimization algorithms is handled within the objective function which specifies the amplitude and phase characteristics simultaneously. Minimizing this objective function using specific starting points yields filter designs that satisfy arbitrary amplitude and phase specifications to within a preset degree of accuracy.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134574795","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
Recent results and open problems in filter banks and subband coding 滤波器组和子带编码的最新研究成果及有待解决的问题
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685682
P. Vaidyanathan
{"title":"Recent results and open problems in filter banks and subband coding","authors":"P. Vaidyanathan","doi":"10.1109/ADFSP.1998.685682","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685682","url":null,"abstract":"A number of interesting problems in filter bank theory are discussed. The emphasis is on optimal subband coders, especially uniform DFT filter banks which are computationally attractive. A number of open problems are mentioned throughout the paper.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132967475","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
Wavelet de-noising of coarsely quantized signals 粗量化信号的小波去噪
1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185) Pub Date : 1998-06-05 DOI: 10.1109/ADFSP.1998.685719
S. Neville, N. Dimopoulos
{"title":"Wavelet de-noising of coarsely quantized signals","authors":"S. Neville, N. Dimopoulos","doi":"10.1109/ADFSP.1998.685719","DOIUrl":"https://doi.org/10.1109/ADFSP.1998.685719","url":null,"abstract":"A methodology to address the problem of generating a de-noised estimate of a coarsely quantized, noise contaminated signal is presented via a two-step wavelet de-noising approach. In the first step, the signal is de-noised in accordance with the traditional wavelet de-noising methodologies, in which the noise contamination is assumed to be Gaussian. In the second step, a correction is then applied, through the use of a moving average signal estimate, to account for the non-Gaussian nature of the coarse quantization noise. This moving average signal estimate is also utilized in analyzing which combination of the tested mother wavelet functions, threshold determination methodologies, and thresholding functions provided the \"best\" estimate of the original noise-free signal. The motivation behind this work is to enable the development of model based fault detection approaches suitable for retro-fitting to existing industrial status monitoring systems.","PeriodicalId":424855,"journal":{"name":"1998 IEEE Symposium on Advances in Digital Filtering and Signal Processing. Symposium Proceedings (Cat. No.98EX185)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116654750","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
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