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International Symposium on Intelligent Signal processing and communications

作者： Wu, David Tan, Damian M. Wu, Hong Ren RMIT Univ Sch Elect & Elect Engn Melbourne Vic 3001 Australia

ISBN: (纸本)9780780397323

A method of encoding digital medical mammograms is presented in this paper. Based on the JPEG2000 coding framework and embedded with an advanced perceptual distortion measure, the proposed coder identifies and removes visually insignificant/irrelevant information, so as to achieve perceptually lossless quality. Compared with the state-of-the-art JPEG compliant LOCO lossless coder and JPEG2000 lossless coder, current results have shown compression ratio gains in bit-rate without any loss of visual fidelity.

关键词： Mammography

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Lossless image compression via predictive coding of discrete Radon projections

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SIGNAL processing-image COMMUNICATION 2008年第4期23卷 313-324页

作者： Kingston, Andrew Autrusseau, Florent Polytech Nantes IRCCyN Lab F-44306 Nantes France Australian Natl Univ Res Sch Phys Sci & Engn Dept Appl Math Canberra ACT 0200 Australia

This paper investigates predictive coding methods to compress images represented in the Radon domain as a set of projections. Both the correlation within and between discrete Radon projections at similar angles can be exploited to achieve lossless compression, The discrete Radon projections investigated here are those used to define the Mojette transform first presented by Guedon et al. [Psychovisual image coding via an exact discrete Radon transform, in: T.W. Lance (Ed.), Proceedings of the visual communications AND image processing (VCIP), May 1995, Taipei, Taiwan, pp. 562-572]. This work is further to the preliminary investigation presented by Autrusseau et al. [Lossless compression based on a discrete and exact radon transform: a preliminary study, in: Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal processing (ICASSP), vol. II, May 2006, Toulouse, France, pp. 425-428]. The I D Mojette projections are re-arranged as two dimensional images, thus allowing the use of 2D image compression techniques onto the projections. Besides the compression capabilities, the Mojette transforms brings an interesting property: a tunable redundancy. As the Mojette transform is able to both compress and add redundancy, the proposed method can be viewed as a joint lossless source-channel coding technique for images. We present here the evolution of the compression ratio depending on the chosen redundancy. (c) 2008 Elsevier B.V. All rights reserved.

关键词： lossless image coding discrete Radon transform Mojette redundancy

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Platform-based MPEG-4 SOC design for video communications

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Journal of VLSI Signal processing Systems for Signal, image, and Video Technology 2006年第1期42卷 7-19页

作者： Chang, Yung-Chi Chao, Wei-Min Hsu, Chih-Wei Chen, Liang-Gee Department of Electrical Engineering Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan Department of Electrical Engineering GIEE NTU Taipei Taiwan Electronics Research and Service Organization Industrial Technology Research Institute Hsinchu Taiwan IEEE CAS Technical Committee of VLSI Systems and Applications Technical Committee of Visual Signal Processing and Communications IEEE Signal Processing Technical Committee of Design and Implementation of SP Systems IEEE CAS Technical Committee on Multimedia Systems and Applications Phi Tan Phi

An MPEG-4 video coding SOC design is presented in this paper. We adopt platform-based architecture with an embedded RISC core and efficient memory organization. A motion estimator supporting predictive diamond search and spiral full search is implemented for compromise between compression performance and design cost. The proposed data reuse scheme reduces required memory access bandwidth. For texture coding path, an interleaving DCT/IDCT scheduling with substructure sharing technique is proposed. Several key modules are integrated into an efficient platform in hardware/software co-design fashion. The cost-efficient video encoder SOC consumes 256.8 mW at 40 MHz and achieves real-time encoding of 30 CIF (352×288) frames per second. © Springer Science + Business Media, Inc. 2006.

关键词： Multimedia systems

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An efficient implementation of the nearest neighbor based visual objects tracking

An efficient implementation of the nearest neighbor based vi...

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International Symposium on Intelligent Signal processing and communications

作者： Choeychuen, Kairoek Kumhom, Pinit Chamnongthai, Kosin King Mongmuts Univ Technol Dept Elect & Telecommun Engn Bangkok 10140 Thailand

ISBN: (纸本)9780780397323

An independent visual objects tracking is less reliable than the data association of visual objects tracking. This paper describes a tracking method based on the nearest neighbor (NN) data association, which serves lower computational than do the multiple hypothesis tracking (MHT) or the Joint probabilistic data association filter (JPDAF) but gives low reliability, if the number of targets is increased. This reliability can be increased by selecting appropriate visual object model. To obtain low computation while capable of handling non-rigid object, we propose an object model which combines the threshold of accumulated object region and the object bounding box. The elements of the association matrix are the distance function that is proposed as a mixture of object models of distance function. The combinations of object models of distance function are important mechanism for determining appropriate state of object correspondence which can be divided into six groups: updated track, missing track, newly track, grouped track, merged track and complex track. The missing track is solved by the track life time criterion while the grouping, the merged and the complex track are resolved by using the proposed NN algorithm again. The experimental results are correctly shown on various situations of correspondence problem from surveillance image sequences.

关键词： image segmentation

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WAVELET image MODELING AND ITS APPLICATION IN MODEL-BASED image-CODING

WAVELET IMAGE MODELING AND ITS APPLICATION IN MODEL-BASED IM...

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Conference on visual communications and image processing 94

作者： GUAN, L UNIV SYDNEY DEPT ELECT ENGNSYDNEYNSW 2006AUSTRALIA

ISBN: (纸本)081941638X

This paper describes an image modeling scheme based on wavelet signal decomposition and statistical texture analysis, and its application in model-based image coding. In this approach, the image being considered is first decomposed into octal signal bands which contains different spectral components of the images. Based on the property of the signal decomposition statistical texture analysis techniques are hierarchically employed to separate the image into different categories with distinct modeling parameters. Coding is performed based on the texture image model.

关键词： image compression Wavelets Model-based design Discrete wavelet transforms Wavelet transforms Statistical modeling Motion models image analysis Statistical analysis image transmission

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An adaptive de-blocking method based on measuring flatness of macroblock

An adaptive de-blocking method based on measuring flatness o...

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2006 International Symposium on Intelligent Signal processing and communications, ISPACS'06

作者： Shilin, Xu Li, Yu Guangxi, Zhu Department of Electronics and Information Engineering National Laboratory for Optoelectronics Huazhong University of Science and Technology 430074 Wuhan Hubei China

ISBN: (纸本)0780397339

Block artifact is a serious problem which generally emerges in video or image compression system based on block. In H.264, strength, a value which indicates the degree of block artifact, is obtained by the prediction mode, reference frames and motion vectors. However, in some cases, the de-blocking method in H.264 is not so satisfactory because of the ignorance of image behavior. According to the research of HVS (human visual system), the blockiness in flat region is much more easily observed than that in complicated region. Thus, it is needed to evalute the flatness of a particular region so as to measure the strength of blockiness. In this paper, a de-blocking method which is based on the flatness of two adjacent blocks is proposed. In the experiment, it is proved that this flatness-based de-blocking method has more superior performance than the traditional one in H.264. © 2006 IEEE.

关键词： image compression

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A novel approach to image denoising in multi-wavelet domain

A novel approach to image denoising in multi-wavelet domain

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4th International Conference on communications, Circuits and Systems (ICCCAS 2006)

作者： Zhou, Yongming Lai, Shengli Liu, Leian Lv, Peizhuo Yu, Jian Zhou, Yongming South China Univ Technol Sch Elect & Informat Engn Guangzhou 510640 Guangdong Peoples R China Shaoguan Univ Dept Elect Engn Shaoguan 512005 Peoples R China

ISBN: (纸本)0780395840

This paper presents a new algorithm of image de-noising. This new algorithm introduces both a new threshold function and multilevel threshold, and has not only the de-noising ability of the energy-adaptation, but also the capability of protecting edge information of image signal during the de-noising process. Simulation results based on CL2 multi-wavelet transformation indicate that the de-noising approach with both the new threshold function and multilevel threshold outperforms the previous image de-noising methods in both visual effect and signal-to-noise ratio.

关键词： image analysis

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Statistical multiplexing based on MPEG-4 fine granularity scalability coding

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Journal of VLSI Signal processing Systems for Signal, image, and Video Technology 2006年第1期42卷 69-77页

作者： Yang, Xiaokang Ling, Nam Institute of Image Communication and Information Processing Shanghai Jiao Tong University 800 Dong Chuan Road Shanghai 200240 China Department of Computer Engineering Santa Clara University 500 El Camino Real Santa Clara CA 95053 United States Institute of Image Communication and Information Processing Department of Electronic Engineering Shanghai Jiao Tong University Shanghai China Visual Signal Processing Communications Technical Committee IEEE Circuits and Systems Society Department of Computer Engineering California United States National University of Singapore IEEE SPIE ASEE

Conventional statistical multiplexing methods for MPEG-1/2 programs involve high computationally complex transcoding (decoding and re-encoding) process to convert the original bit-rate into the target bit-rate. To avoid a time-consuming transcoding process, a new statistical multiplexer is proposed to enable content provider to easily convert the bit-rates by exploiting the MPEG-4 fine granularity scalability (FGS) coding scheme. The proposed statistical multiplexer is particularly useful for multiple-program broadcasting applications, including Internet television and video on demand, as well as value-added MPEG-4 video streaming services for DVB and ATSC digital TV systems. The proposed multiplexer mainly includes two parts: the FGS-based frame lag scheme and the optimal bit-plane truncation scheme. The FGS-based frame lag scheme exploits intra- and inter-layer correlations exist in MPEG-4 FGS bit-streams. The optimal bit-plane truncation scheme dynamically truncates enhancement layers of FGS bit-streams under the available bandwidth constraint and the quality/smoothness constraint. Experimental results show that high statistical multiplexing efficiency, inter-program fairness, and intra-program smoothness are achieved by the proposed multiplexer. © Springer Science + Business Media, Inc. 2006.

关键词： Multimedia systems

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Face re-orientation in video conferencing by approximating normal distributed depth

Face re-orientation in video conferencing by approximating n...

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Conference on visual communications and image processing 2004

作者： Yip, B Jin, JS Univ Sydney Sch Informat Technol Sydney NSW 2006 Australia

ISBN: (纸本)0819452114

The lack of eye contact in video conference degrades the user experience. This problem has been known and studied for many years. There are hardware-based solutions to the eye gaze problem;however, these specialized systems are not generally accessible. This paper assumed the depth of the scene taken from the monocular camera is normal distributed on the XY plane on the real world, the plane parallel to the view plane. The three dimensional normal curve is initially estimated from the face model of the user. By performing rotation operation on the normal curve, the orientation of the face is rectified. The approach suggested in this paper is fast and effective. It has the advantages of 3D modelling, but could save the steps on complex registration, texture mapping and rendering.

关键词： face re-orientation video conference depth map bi-variate normal distribution

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Input-agnostic vs. input-specific image secret sharing

Input-agnostic vs. input-specific image secret sharing

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48th International Symposium ELMAR-2006 on Multimedia Signal processing and communications

作者： Lukac, Rastislav Plataniotis, Konstantinos N. Univ Toronto Edward S Rogers Sr Dept Elect & Comp Engn 10 Kings Coll Rd Toronto ON M5S 3G4 Canada

ISBN: (纸本)9789537044039

In this paper, we focus on the bit-level processing based image secret sharing framework which consisis of the so-called input-agnostic and input-specific solutions. It will be demonstrated that both these sub-classes in processing classes satisfy the essential perfect reconstruction property while making fundamental differences in processing the secret image and protecting the visual data.

关键词： image secret sharing perfect reconstruction bit-level processing input-agnostic input-specific

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