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Multiscale segmentation of SAR imagery with bootstrap sampling

Multiscale segmentation of SAR imagery with bootstrap sampli...

引用

international conference on Signal processing Proceedings (ICSP)

作者： Tian Zheng Wen Xian-Bin Lin Wei Department of Mathematics and Information Science Northwestern Polytechnical University Xi'an China Department of Mathematics and Information Science Shandong University of Technology Zibo China College of Computer Northwestern Polytechnical University Xi'an China

In this paper, the main focus is on application of bootstrap method for segmentation of SAR imagery based on the multiscale dynamic model. Given an original SAR images, we randomly select a small representative set of pixels. then, multiscale autoregressive (MAR) model, which captures multiscale stochastic structure inherent in SAR imagery, is used for SAR imagery segmentation. the results we obtain show that our method based on bootstrap sampling gives better results than the classical one both in the quality of the segmented image and the computational time.

关键词： Image segmentation Image sampling Statistical distributions Pixel Target recognition Synthetic aperture radar Least squares approximation Pulse width modulation Modems Mathematics

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A new adaptive step-size blind equalization algorithm based on autocorrelation of error signal

A new adaptive step-size blind equalization algorithm based ...

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international conference on Signal processing Proceedings (ICSP)

作者： Zhang Xiong Li Linsheng Zhuo Dongfeng Dong Zengshou Zhang Liyi Taiyuan Heavy Machinery Institute College of Electronics and Information Engineering Taiyuan China College of Information Engineering Taiyuan University of Technology Taiyuan China

In this paper, a new adaptive step-size CMA blind equalization algorithm has been proposed to enhance the performance of the constant modulus algorithm (CMA) for blind equalization of time-varying channel. the time-varying step-size sequence is adjusted by the autocorrelation of the error signal. the new algorithm provides fast convergence at early stages of iteration while ensuring small final misadjustment. Simulation results comparing the proposed algorithm and conventional CMA algorithm confirm the new algorithm's improved performance.

关键词： Adaptive equalizers Blind equalizers Autocorrelation computer errors Educational institutions Cost function Algorithm design and analysis Machinery Electronic mail Convergence

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A new method for automatic pattern acquisition to extract information from biomedical texts

A new method for automatic pattern acquisition to extract in...

引用

international conference on Signal processing Proceedings (ICSP)

作者： Minlie Huang Xiaoyan Zhu Ming Li Department of Computer Science and Technology Tsinghua University Beijing China Bioinformatics Laboratory School of Computer Science University of Waterloo Waterloo Canada

Recently there have been many information extraction tasks applied to the biomedical domain, some of which contribute to extract protein-protein interactions from biomedical texts. this paper presents a new method for automatic pattern acquisition to extract protein interactions. the system automatically generates patterns by aligning sequences of tags of sentences from unlabeled corpus. To obtain a high tagging accuracy, we propose a morphology-based tagging method with a pre-tagging strategy for Brill's tagger. Our method differs from the previous pattern acquisition algorithms in the ways: first, it does not need to provide any seed word or pattern before the algorithm runs; second, we do not apply any parsing algorithm. Lastly, our method, which is based on dynamic programming, is fast.

关键词： Data mining Proteins Tagging computer science Testing Sequences Dynamic programming DNA Laboratories Biological processes

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Turbo ESAE channel estimation on OFDM systems

Turbo ESAE channel estimation on OFDM systems

引用

international conference on Signal processing Proceedings (ICSP)

作者： Zhang Yubing Kuang Jingming Liu Jiakang School of Information Engineering Beijing Institute of Technology Beijing China

the PSAM (pilot-symbol assisted modulation) technique is the common channel estimation method for OFDM systems by using the time and frequency correlation of the channel. ESAE (extended symbol aided estimation) method has more robust feature in fast fading channel. But ESAE has an unstable property in a high-speed environment. In this paper, we proposed the Turbo ESAE and adaptive turbo ESAE channel estimation algorithm that is based on conventional ESAE algorithm and utilize the soft output of the turbo decoder. computer simulation results show that the proposed methods have lower algorithm complexity and shorter processing delay than iterative channel estimation algorithms and can decrease the effects of the error accumulation in time and frequency selective channel.

关键词： Channel estimation Iterative algorithms Frequency estimation OFDM modulation Robustness Fading Iterative decoding computer simulation Delay effects Delay estimation

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Robust Kalman filter and smoothing recursive estimator for multiscale autoregressive process

Robust Kalman filter and smoothing recursive estimator for m...

引用

international conference on Signal processing Proceedings (ICSP)

作者： Wen Xian-Bin Tian Zheng Lin Wei Shandong University of Technology Zibo China College of Computer Northwestern Polytechnical University Xi'an China Department of Mathematics and Information Science Northwestern Polytechnical University Xi'an China

A current topic of great interest is the multiresolution analysis of signals and the development of multiscale signal processing algorithms. In this paper, we focus on making the Kalman filter robust for multiscale autoregressive (MAR) model. the equivalence between the Kalman filter in optimal estimation algorithm for MAR model and a particular least squares regression problem is established. And the regression problem is solved robustly using a statistical approach named M-estimation. the robustness of the proposed approach is demonstrated with simulation.

关键词： Robustness Smoothing methods Recursive estimation Filters Signal processing algorithms Stochastic processes Algorithm design and analysis Random processes Gaussian noise Noise generators

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Independent component analysis applied to steganalysis

Independent component analysis applied to steganalysis

引用

international conference on Signal processing Proceedings (ICSP)

作者： Hongchen Dou Hongbin Zhang Shuanghuan Zhan Computer Institute of Beijing University of Technology Beijing China

Universal steganalysis techniques attempt to detect hidden information without knowledge about the steganographic methods. One of the mast important things is to find feature sets, which are sensitive to the embedding process. Whether these features are "good" directly influence the accuracy of detection. this paper describes an approach to define sensitive feature sets using ICA (independent component analysis) decomposition and prediction in order to build statistical models of image independent component. Kernel-SVM is then used to discriminate between stego-images and cover-images.

关键词： Independent component analysis Steganography Integrated circuit modeling Feature extraction Image edge detection US Department of Transportation Coils Predictive models Decoding Additive noise

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A model of primary visual sense with wavelets characterization

A model of primary visual sense with wavelets characterizati...

引用

international conference on Signal processing Proceedings (ICSP)

作者： Yin Hui Luo Si Wei Huang Ya Ping School of Computer and Information Technology Beijing Jiaotong University Beijing China

In this paper, a 3-band wavelets transform, which has two main characteristics of primary visual sense: Gabor function model and 3 scale transform, is used to simulate the processing of simple cell in the visual cortex. Because of higher order statistics properties of the environment, the input response under the multiresolution analysis is decomposed linearly by using the independent component analysis (ICA) and the basis functions at each resolution are extracted. the experimental results indicate that our model with wavelets characterization could simulate the response characteristic of primary visual sense preferably.

关键词： Brain modeling Retina Neurons Independent component analysis Frequency Electronic mail Statistical analysis Sensor phenomena and characterization Data mining Feature extraction

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Relative gradient on SO(N): case of source separation

Relative gradient on SO(N): case of source separation

引用

international conference on Signal processing Proceedings (ICSP)

作者： Su Yong Ye Zhongfu Dept. EEIS University of Science and Technology of China Hefei Anhui P.R. China Institute of Statistical signal Processing Department EEIS University of Science and Technology Hefei Anhui China

Whitening is a popular method to reduce the complexity of the problems in ICA. In the linear instantaneous mixing model, the search space of the separation matrix is restricted to the special orthogonal group SO(N) by the prewhitening of the observations. this paper proposes a new learning rule in blind source separation using RGOSOG (relative gradient on SO(N)) method. We show that when the contrast function is the Renyi's mutual information (RMI), the algorithm based on RGOSOG is easier to implement and the complexity of RGOSOG method is less than that of the conventional gradient descent method. Simulation illustrate that the new algorithm has the same performance on signal-to-distortion ratio as the conventional one.

关键词： computer aided software engineering Source separation Independent component analysis Eigenvalues and eigenfunctions DH-HEMTs Petroleum Argon Stochastic processes

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A 2 kb/s enhanced waveform interpolation speech coder

A 2 kb/s enhanced waveform interpolation speech coder

引用

international conference on Signal processing Proceedings (ICSP)

作者： Li Jing Bao Changchun School of Electronic Information and Control Engineering Beijing University of Technology Beijing China

In this paper, a 2 kb/s waveform interpolation speech coding scheme is described based on the EWI speech coding model proposed by Oded Gottesman. the algorithm produces high quality speech with the improved quantization methods for encoder parameters. In this 2 kb/s enhanced waveform interpolation speech coding, the rapidly evolving waveform (REW) magnitude is represented by the 2-D parametric surface and quantized with the analysis-by-synthesis (A-b-S) approach, the slowly evolving waveform (SEW) is optimized and quantized with A-b-S method as well, and the power is quantized with switched-predictive A-b-S method. the computer simulation results and subjective tests show that the coded speech quality exceeds that of federal standard 2.4 kb/s MELP coder greatly.

关键词： Interpolation Speech enhancement Speech coding Quantization Surface waves Speech analysis Optimization methods computer simulation Testing Code standards

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A uniform framework of representation and structure reconstruction for generic form image

A uniform framework of representation and structure reconstr...

引用

international conference on Signal processing Proceedings (ICSP)

作者： Qing Wang Jinsheng Shi D.D. Feng School of Information Technologies University of Sydney NSW Australia School of computer Science Northwestern Polytechnical University Xi'an China Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China

In the paper, we propose a novel uniform representation of generic form, within which three typical categories are defined according to the logical layout from the view point of human vision, which are explicit, semiexplicit, and implicit style form. Under the uniform framework, the different criteria are also defined and carried out on the difference kinds of forms, based on the frame line extraction using single-connected chains. Meanwhile, two subclasses of semiexplicit form, mendable and unmendable ones, are discovered and can be reconstructed by key points matching and bounding box dilation so that we can deal with a number of variations of form structure. the experimental results have shown that our proposed framework is effective and reasonable for layout analysis and structure reconstruction.

关键词： Image reconstruction information technology Australia Insurance Banking Text analysis Smoothing methods Testing Document image processing

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