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New parameter estimation approaches for dual-input 11C-acetate liver kinetic model

New parameter estimation approaches for dual-input 11C-aceta...

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作者： Chen, Sirong Feng, Dagan Department of Electronic and Information Engineering Center for Multimedia Signal Processing Hong Kong Polytechnic University Hong Kong Hong Kong Biomedical and Multimedia Information Technology Group School of Information Technologies University of Sydney Australia

ISBN: (纸本)008045108X

11C-acetate uptake in hepatocellular carcinoma (HCC) was reported and the modeling study has been conducted, in which the weighted nonlinear least squares (NLS) algorithm was used to estimate all of the parameters. However, the computational time-complexity of NLS method is high and some estimates are not quite reliable. Due to the hepatic dual blood supply, the current developed fast algorithms could not be used directly. in this paper, two new estimation approaches were presented: Patlak-NLS and Patlak-dual-input-generalized linear least squares. The estimation results demonstrated that these two methods could provide better and practical ways for dual-input 11C-acetate liver kinetic modeling. Copyright © 2005 IFAC.

关键词： Parameter estimation

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View synthesis optimization based on texture smoothness for 3D-HEVC 40

View synthesis optimization based on texture smoothness for ...

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40th IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP 2015

作者： Dou, Huan Chan, Yui-Lam Jia, Ke-Bin Siu, Wan-Chi Digital Multimedia Information Processing and Communication Technique Lab Department of Electronic Information and Control Engineering Beijing University of Technology Beijing China Center for Signal Processing Department of Electronic and Information Engineering Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)9781467369978

This paper presents view synthesis optimization for 3D-HEVC based on a new texture smoothness process. In the original method, all pixels are exhaustively rendered to get distortions from synthesized views. Since not all pixels from the distorted depth map may cause distortions in the synthesized view, it brings unnecessary coding complexity. In this paper, lines of pixels are skipped based on the analysis of pixel regularity from smooth texture regions. It is due to the fact that the distorted disparity may not have much effect on the synthesized view in smooth texture regions. The proposed method can reduce the coding complexity of view synthesis optimization without significant performance loss. © 2015 IEEE.

关键词： 3D-HEVC depth coding texture smoothness view synthesis optimization VSO

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Automatic generation of pen-and-ink drawings from photos

Automatic generation of pen-and-ink drawings from photos

引用

2004 International Conference on Image processing, ICIP 2004

作者： Song, Jiatao Chi, Zheru Liu, Jilin Fu, Hong Center for Multimedia Signal Processing Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Hong Kong Institute of Information and Communication Engineering Zhejiang University Hangzhou 310027 China

In this paper, a new algorithm for automatic generating pen-and-ink drawings from photos is presented. The basic processing step of our system is the edge extraction based on the multi-resolution property of Wavelet Transform. In order to enhance the variations in texture and tone, the proposed algorithm includes two binarization steps and a noise removing step. Experimental results show that the generated pen-and-ink drawings are of high quality, which accurately illustrate the scenic contents of the original photos. ©2004 IEEE.

关键词： Drawing (graphics)

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Hybrid registration for two-dimensional gel protein images

引用

3rd Asia-Pacific Bioinformatics Conference, APBC 2005

作者： Wang, Xiuying Feng, David Dagan Group School of Information Technologies University of Sydney Sydney NSW 2006 Australia Center for Multimedia Signal Processing Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)1860944779

Image registration technique is fundamental and essential to the accurate and efficient analysis of protein sequence data. But due to the elastic deformations of two-dimensional gel protein eletrophoresis images, their registration still remains a challenge. In this paper, a hybrid 2D gel protein image registration method is proposed. In the first stage of registration, the wavelet-based hierarchical registration which fully exploits the image intensity is used to correct global displacements and affine transformation parameters are achieved. In the second stage, the landmark-based elastic registration is introduced to correct local displacements and enhance registration performance and accuracy. In the proposed method, the hierarchical registration from low resolution to high resolution can accelerate the registration convergence and hence good computational efficiency can be achieved. Though wavelets have been widely used in image processing, its application in the area of gel protein image registration is not well investigated. In this paper, the wavelet-based hierarchical approach is introduced in 2D gel protein image registration. The algorithm makes use of the merits of the existing categories of registration techniques and achieves high performance registration results automatically.

关键词： Image registration

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Multiscale registration for noisy medical images

Multiscale registration for noisy medical images

引用

2010 International Conference on Computer Design and Applications, ICCDA 2010

作者： Li, Dengwang Wang, Xiuying Wang, Hongjun Yin, Yong Feng, David Dagan School of Infonnation Science and Engineering Shandong University China Biomedical and Multimedia Infonnation Technology Research Group University of Sydney Australia Department of Radiation Oncology Shandong Tumor Hospital China Center for Multimedia Signal Processing Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9781424471638

A multiscale deformable registration framework is proposed by combining edge preserving scale space with the free form deformation (FFD) for robust registration of noisy medical images. The edge preserving scale space derived from the total variation model with the L1 norm (TV-L1) has two advantages for registration: the first one is removing noise from the image pairs to be registered and the second one is selecting edges and contours of an image according to their geometric sizes. After being denoised, the selected edges and contours are sufficient enough to drive deformation using the FFD grid at each scale. Then the deformation fields are gained accurately in a coarse-to-fine manner. The proposed method is effective where one or both of the images to be registered with significant level of noise. Experiments on both artificially deformed medical images with ground truth and clinical CBCT images demonstrate the accuracy and robustness of our proposed multiscale deformable registration techniques. © 2010 IEEE.

关键词： Deformation

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Subjective quality assessment database of HDR images compressed with JPEG XT

Subjective quality assessment database of HDR images compres...

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International Workshop on Quality of multimedia Experience, QoMEx

作者： Pavel Korshunov Philippe Hanhart Thomas Richter Alessandro Artusi Rafał Mantiuk Touradj Ebrahimi Multimedia Signal Processing Group (MMSPG) EPFL RUS Computing Center University of Stuttgart Universitat de Girona (UdG) Bangor University

Recent advances in high dynamic range (HDR) capturing and display technologies attracted a lot of interest to HDR imaging. Many issues that are considered as being resolved for conventional low dynamic range (LDR) images pose new challenges in HDR context. One such issue is a lack of standards for HDR image compression. Another is the limited availability of suitable image datasets that are suitable for studying and evaluation of HDR image compression. In this paper, we address this problem by creating a publicly available dataset of 20 HDR images and corresponding versions compressed at four different bit rates with three profiles of the upcoming JPEG XT standard for HDR image compression. The images cover different scenes, dynamic ranges, and acquisition methods (fusion from several exposures, frame of an HDR video, and CGI generated images). The dataset also includes Mean Opinion Scores (MOS) for each compressed version of the images obtained from extensive subjective experiments using SIM2 HDR monitor.

关键词： Image coding Transform coding Monitoring Bit rate Standards Dynamic range

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Multimodal interface techniques in content-based multimedia retrieval 3rd

Multimodal interface techniques in content-based multimedia ...

引用

3rd International Conference on Multimodal Interfaces, ICMI 2000

作者： Ren, Jinchang Zhao, Rongchun Feng, David Dagan Siu, Wan-Chi Department of Computer Science and Engineering Northwestern Polytechnic University Xi’an710072 China Center of Multimedia Signal Processing Dept. of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong Department of Computer Science The University of Sydney Australia

ISBN: (纸本)3540411801

Multimodal interfaces (MI) can well improve the interactivity between users and computers through cooperation of different interactive devices and methods to exchange information and understand their requirements or response. As a hotspot in information processing, content-based retrieval (CBR) of multimedia has intrinsic demand for multimodal interface techniques to suit for input/output of multiple media types. In this paper, different MI techniques in CBR of multimedia are introduced, which are classified into three classes, namely traditional CUI/GUI, multimedia UI and intelligent multimodal UI. The analysis and comparison of these MI techniques with corresponded media retrieval ways are also given. It is hoped that the investigation in this paper can much promote the work both in MI and CBR of multimedia for efficient and effective information interaction between human and machines. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Content based retrieval

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Evaluation of hepatocellular carcinoma with dynamic11C-acetate PET: A dual-modeling method

Evaluation of hepatocellular carcinoma with dynamic11C-aceta...

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作者： Chen, Sirong Feng, Dagan IEEE Center for Multimedia Signal Processing Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Hong Kong Department of Nuclear Medicine PET Hong Kong Sanatorium and Hospital Hong Kong Hong Kong Biomedical and Multimedia Information Technology Group School of Information Technologies University of Sydney Australia

Quantification of the 11C-acetate liver studies with dynamic positron emission tomography (PET) could significantly improve the evaluation of hepatocellular carcinoma (HCC), where both time-activity curves (TACs) of the hepatic artery (HA) and portal vein (PV) (the dual hepatic blood supply) are required. However, directly measuring them by the blood sampling or cannulation procedure is very invasive. In addition, it is very hard to differentiate the PV from the surrounding liver tissue on PET images by the currently developed indirect methods. To noninvasively and efficiently access the TAC of PV, we investigated the possibility of modeling the dual hepatic blood supply and presented two hepatic dual-input (DI) models. Combining the established 11C-acetate liver model with two different DI models, we obtained two dual-models with six/seven parameters to fit the dynamic PET measurements. The fitting results were compared with those of the 11C-acetate liver model using image-derived dual hepatic inputs (the "Golden standard") by statistical study. The adequacy of the two dual-models was estimated by Akaike Information Criteria (AIC) and Schwarz Criteria (SC). It was revealed that the proposed modeling technique could successfully account for the hepatic dual blood supply and the six-parameter (6-P) dual-model is more suitable for quantification of 11C-acetate liver studies. © 2008 IEEE.

关键词： Positron emission tomography

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On the non-uniqueness problem and the semi-blind source separation

On the non-uniqueness problem and the semi-blind source sepa...

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2009 IEEE Workshop on Applications of signal processing to Audio and Acoustics, WASPAA 2009

作者： Nesta, Francesco Wada, Ted S. Miyabe, Shigeki Juang, Biing-Hwang Università di Trento Italy Center for Signal and Image Processing Georgia Institute of Technology Atlanta GA United States Department of Information Physics and Computing Graduate School of Information Science and Technology University of Tokyo Japan

ISBN: (纸本)9781424436798

Semi-blind source separation (SBSS) is a special case of the well-known source separation problem when some partial knowledge of the source signals is available to the system. In particular, a batch-wise adaptation in the frequency domain based on the independent component analysis (ICA) can be effectively used to jointly perform source separation and multi-channel acoustic echo cancellation (MCAEC) without double-talk detection. However, the non-uniqueness problem due to the correlated far-end reference signals still affects the SBSS approach. In this paper, we analyze the structure of the SBSS de-mixing matrix and the behavior of a batch on-line adaptation algorithm under two most common far-end mixing conditions. We show that with a proper constraint on the de-mixing matrix, high echo reduction can be achieved just as the misalignment remains relatively low even for the worst-case scenario of single far-end talker and also without any pre-processing procedure to decorrelate the far-end signals. ©2009 IEEE.

关键词： Blind source separation

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Chaos-based spread spectrum robust watermarking in DWT domain

Chaos-based spread spectrum robust watermarking in DWT domai...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Wei Lu Hong-Tao Lu Fu-Lai Chung Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China Center for Multimedia Signal Processing and Department of Computing Hong Kong Polytechnic University Hong Kong China

This paper presents a chaos-based robust digital image watermarking scheme in DWT domain. Because chaos is highly sensitive to its initial state, it can be used to permute the original image and make the image's spectrum spread. Entire DWT is applied into the permuted host image. Since the permuted image is a noise-like signal, the high frequency band after DWT is proper for watermark embedding. A binary image watermark is constructed by using chaotic map to embedded in the subband of DWT. Watermark detection is by computing the statistical correlation between the watermarked signal and the original watermark. Experimental results show good performance of the proposed scheme on resisting common watermarking attacks and geometric attacks.

关键词： Chaos Spread spectrum communication Robustness Watermarking Discrete wavelet transforms Chaotic communication Frequency Cryptography Digital images Data security

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