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A new application of texture unit coding to mass classification for mammograms

A new application of texture unit coding to mass classificat...

引用

2004 International Conference on Image processing, ICIP 2004

作者： Chen, Yuan Chang, Chein-I. Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250

Texture is one of important features of masses in mammograms. A recent texture unit-based texture spectrum approach, referred to as Texture Unit Coding (TUC) has shown promise in texture classification. This paper presents a new application of the TUC to mass classification in mammograms. The TUC generates a texture spectrum for a texture image that can be used to describe the characteristics of masses. It also develops an information divergence (ID)-based discrimination criterion to measure the discrepancy between two texture spectra, a concept yet to explore in texture analysis. The TUC along with ID are further applied to mass classification in mammograms where the MiniMammographic Database provided by the Mammographie Image Analysis Society (MIAS) is used for experiments. ©2004 IEEE.

关键词： Mammography

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Prosody and style controls in CU VOCAL using SSML and SAPI XML tags

Prosody and style controls in CU VOCAL using SSML and SAPI X...

引用

2004 International Symposium on Chinese Spoken Language processing

作者： Fung, Tien-Ying Li, Yuk-Chi Meng, Helen Ching, P.C. Human-Computer Communications Laboratory Department of Systems Engineering and Engineering Management Chinese University of Hong Kong Digital Signal Processing Laboratory Department of Electronic Engineering Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0780386787

CU VOCAL is a Cantonese text-to-speech (TTS) engine. We use a syllable-based concatenative synthesis approach to generate intelligible and natural synthetic speech in Cantonese. This paper reports on our recent enhancements in CU VOCAL to support user adjustments in prosody and style with the use of the Speech Synthesis Markup Language (SSML) [1, 2] in the input text. CU VOCAL was previously developed as a SAPI-compliant engine to enable easy integration with other applications. This paper also reports on our enhancements in the CU VOCAL SAPI engine to support the SAPI 5 XML tags. ©2004 IEEE.

关键词： Speech synthesis

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New challenges in non-linear signal and image processing 12

New challenges in non-linear signal and image processing

引用

12th European signal processing Conference, EUSIPCO 2004

作者： Marshall, Stephen Dougherty, Edward R. Institute for Communications and Signal Processing Department of Electronic and Electrical Engineering University of Strathclyde 204 George Street GlasgowG1 1XW United Kingdom Genomic Signal Processing Laboratory Department of Electrical Engineering 214 Zachry Engineering Center Texas AandM University College StationTX77843 United States

ISBN: (纸本)9783200001657

This paper will trace the origins of non-linear signal and image processing techniques from their separate sources based in set theory and logic to the more unified field that we see today. It will outline the technical difficulties resulting from the abandonment of well-known linear design methods and the subsequent advantages in terms of improved results. Some new design methods such as statistical estimation will be summarised. Finally, new challenges, such as the extension to multivariate data and applications in security, control and bioscience will be introduced. These will topics will be covered in more detail by subsequent speakers. © 2004 EUSIPCO.

关键词： Design

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The effects of packet reordering in a wireless multimedia environment

The effects of packet reordering in a wireless multimedia en...

引用

1st International Symposium on Wireless Communication Systems 2004, ISWCS '04

作者： Arthur, Colin M. Girma, Demessie Harle, David Lehane, Andrew Institute for Communications and Signal Processing Department of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom Measurement Research Laboratory Agilent Laboratories South Queensferry Edinburgh United Kingdom

ISBN: (纸本)0780384725

Packet Reordering has been shown to be an ever-increasing phenomenon on the Internet and must be taken into account when considering performance analysis of both fixed, wireless and mixed media networks. Previous work [1] has demonstrated that TCP suffers degraded performance in situations of high packet reordering. This paper will consider why video traffic over UDP also performs badly in situations of high packet reordering, due to the temporal inter-packet dependencies introduced by the MPEG video encoding structure. Wireless networks are especially prone to problems due to the higher levels of link layer retransmissions found in noisy wireless environments. An experimental investigation into the effects of video packet reordering using the Windows Media streaming system is presented. A method for invoking packet reordering is introduced, and a tool for client-side measurements of video quality is presented. Typical measurements of video performance undergoing reordering are shown, with a study of buffering occupancy at the client, and the potential impact this could have on video packet reordering demonstrated. © 2004 IEEE.

关键词： Wireless telecommunication systems

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Influence of data frame duration on performance of BITCM system over HV power line

Influence of data frame duration on performance of BITCM sys...

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SympoTIC'04 - Joint 1st Workshop on Mobile Future and Symposium on Trends in communications - Proceedings

作者： Mujčić, A. Suljanović, N. Zajc, M. Tasič, J.F. University of Tuzla Faculty of Electrical Engineering Department of Communications Franjevačka 2 75000 Tuzla Bosnia and Herzegovina University of Ljubljana Faculty of Electrical Engineering Digital Signal Processing Laboratory Tržaška 25 1000 Ljubljana Slovenia

ISBN: (纸本)078038556X

The impulse noise in the HV power line channel is mainly caused by high voltage existing on conductors and station apparatus. Such impulse noise has repetition rate of 50 or 150 Hz and is synchronous to power frequency period. In this paper, we have shown that the digital transmission via HV PLC channel have better performance if it is realized through the transmission of interleaved data blocks. The data frame duration must be adjusted to the periodicity of impulse noise or the power frequency period. © 2004 IEEE.

关键词： Electric lines

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How to effectively utilize information to design hyperspectral target detection and classification algorithms

How to effectively utilize information to design hyperspectr...

引用

2003 IEEE Workshop on Advances in Techniques for Analysis of Remotely Sensed Data

作者： Chang, Chein-I. Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States

ISBN: (纸本)0780383508

Hyperspectral imagery offers a means of uncovering enormous spectral information that can be used for various applications in data exploitation. How effectively such information is used affects the way image analysis algorithms are designed. In this paper, we take up this issue and focus on algorithms designed and developed for target detection and classification in hyperspectral imagery. In order to effectively characterize the information available before and after the data are processed, the a priori information and a posteriori information are used in accordance with how the information is obtained. A piece of information is referred to as a priori information if it is provided by known knowledge before data are processed. On the other hand, a piece of information is referred to as a posteriori information if it is unknown a priori, but can be obtained directly from the data in an unsupervised fashion during the course of data processing. Since a priori information is known beforehand, it can be further decomposed into two types of information, desired and undesired a priori information. The desired a priori information is the knowledge that will assist, improve and enhance data analysis, whereas the undesired a priori information is the knowledge that hinders, interferes or destructs analysis during data processing. This paper investigates how these three types of information play their roles in design and development of several hyperspectral target detection and classification algorithms. Experiments are also conducted to validate their utility. © 2004 IEEE.

关键词： Classification (of information)

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Discrimination and identification for subpixel targets in hyperspectral imagery

Discrimination and identification for subpixel targets in hy...

引用

2004 International Conference on Image processing, ICIP 2004

作者： Chang, Chein-I. Liu, Weimin Chang, Chein-Chi Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250 Department of Civil and Environmental Engineering University of Maryland Baltimore County Baltimore MD 21250

Spectral measures have been used in material identification and discrimination. They are effective if the spectral signatures are calibrated and not contaminated. However, it may not be true in many real applications, specifically, for mixed pixels and subpixel targets. This paper investigates the issue of discrimination and identification for subpixel targets and further develops sample spectral covariance/correlation matrix-based hyperspectral measures to account for spectral variability within subpixel targets. Two types of measures are of interest and studied, Mahalanobis distance-based hyperspectral measures and matched filter-based hyperspectral measures. In order to substantiate the proposed measures, a real data-based comparative analysis is conducted and compared to two spectral similarity measures, spectral angle mapper (SAM) and spectral information divergence (SID) for performance evaluation. The experiments show that both Mahalanobis distance-based hyperspectral measures and matched filter-based hyperspectral measures work very effectively and outperformed the SAM and the SID in discrimination and identification for subpixel targets. ©2004 IEEE.

关键词： Imaging techniques

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Wavelet domain image restoration using adaptively regularized constrained total least squares

Wavelet domain image restoration using adaptively regularize...

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International Symposium on Intelligent Multimedia, Video and Speech processing

作者： Xiaojun Zhang Wei-Ping Zhu Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)0780386876

It is know that the adaptively regularized constrained total least squares (ARCTLS) outperforms the constrained total least squares (CTLS) or the regularized CTLS in image restoration. In this paper, a wavelet domain image restoration approach, using ARCTLS is presented. The degraded image is first decomposed into subband images by using a wavelet transform. The ARCTLS algorithm is then applied to each of the subband images. The proposed restoration method is simulated and compared with the conventional RCTLS and ARCTLS techniques. It is shown that the proposed method yields a better improved signal-to-noise ratio (SNR).

关键词： Wavelet domain Image restoration Least squares methods Degradation AWGN Convolution signal processing signal processing algorithms signal restoration signal to noise ratio

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Object-based image watermarking technique using wavelets

Object-based image watermarking technique using wavelets

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： J. Zan M.O. Ahmad M.N.S. Swamy Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

We present a wavelet-based image watermarking algorithm that is able to embed the watermark information into objects within an image. In the proposed algorithm, the zerotrees in the wavelet coefficient domain corresponding to the selected object(s) are identified. Then the watermark is embedded into the bandpass wavelet coefficients with large amplitudes within these zerotrees by using an appropriate quantization process. The bitmap of the zerotrees corresponding to the selected objects, the wavelet used for the transform, and the parameters for the transform and quantization are chosen as the keys for the proposed algorithm. The effectiveness of the proposed watermarking technique and its robustness against some commonly encountered image processing operations are demonstrated through simulation studies.

关键词： Watermarking Protection Wavelet transforms Image coding Data structures signal processing algorithms Wavelet coefficients Wavelet domain Digital images Quantization

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An acoustic echo cancellation scheme using raised-cosine function for nonlinear compensation

An acoustic echo cancellation scheme using raised-cosine fun...

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IEEE Region 10 International Conference TENCON

作者： Hongyun Dai Wei-Ping Zhu Centre for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

ISBN: (纸本)0780385608

The nonlinear distortion of an acoustic signal caused by the nonlinearity of a power amplifier and/or loudspeaker may give rise to a nonlinear component in acoustic echo cancellation systems. A conventional acoustic echo canceller (AEC) using linear adaptive filtering is not able to eliminate the nonlinear echo component to a satisfactory degree. In this paper, we present a nonlinear echo cancellation technique that uses a nonlinear transformation along with a regular linear adaptive filter for the compensation of the nonlinear echo component. A raised-cosine function is used to derive the nonlinear transformation and the parameters of the nonlinear compensator are updated to adapt to the nonlinearity of the unknown distorting path. The proposed method is simulated in conjunction with the conventional normalized least mean squared algorithm, showing a superior performance of the proposed acoustic echo canceller.

关键词： Nonlinear acoustics Echo cancellers Adaptive filters Loudspeakers Nonlinear distortion Acoustic distortion Polynomials Computational complexity signal mapping Acoustic signal processing

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