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检索条件"主题词=transform coding"

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Improvement of Performance in JPEG2000 Lossy Compression by Signal Modulation

Improvement of Performance in JPEG2000 Lossy Compression by ...

引用

Asia International Conference on Modeling & Simulation

作者： Zohre Foroushi Ali Asghar Beheshti Shirazi Image Processing Lab Iran University of Science and Technology Tehran Iran

ISBN: (纸本)9781424471966;9780769540627

Improvement of performance in sub-band coding system that style in image coding system, is very important. In the coding systems, due to the filter bank that used, coding schemes are classified into two classes, one might have the pair-wise mirror-image property in their filter banks, and performs symmetrically regardless of the sign of the autocorrelation, and the other including JPEG2000 that uses bi-orthogonal 9/7-tap Daubechies filters for lossy compression, has not the mirror image property and performs asymmetrically with inferior performance for negative autocorrelation. In this paper, we want with modulating the negatively-correlated signal sequence by the alternating sign signal with unity magnitude to convert them into positively correlated-sequence. The experimental results for test images show that little gain was obtained by for natural images, since they have small amount of energy in the high frequency bands in horizontal and vertical directions. However 1.5-2dB improvement of PSNR has been obtained for images such as Fingerprint, which have a large amount of energy in high frequency range.

关键词： Performance loss transform coding Image coding Filter bank Autocorrelation Frequency Mirrors Image converters Testing PSNR

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A New Diagnosis Lossless Compression Method for Digital Mammography

A New Diagnosis Lossless Compression Method for Digital Mamm...

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International Conference on Information Engineering and Computer Science (ICIECS)

作者： Ping Xu Wei-Dong Xu Tian-Jian Liu Hua-Jie Chen College of Automation Hangzhou Dianzi University Hangzhou Zhejiang China Department of Physics and Electronic Information Engineering Minjiang University Fuzhou Fujian China

With the rapidly growing use of digital images in medical archival and communication, image compression technology, especially diagnosis lossless compression technology, plays a more and more important role for medical applications. In this thesis, a novel diagnosis loseless compression algorithm is presented for digital mammography. The mammogram is divided into breast region, pectoral muscle and background using the CAD technologies. Then the breast region and pectoral muscle are compressed losslessly and lossily using arbitrary shape ROI compression algorithm respectively. The background can be discarded or compressed as user's will. Experimental results show that the proposed method offer potential advantage in medical applications of digital mammography compression.

关键词： Image coding Breast Muscles Mammography transform coding Design automation Encoding

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Well-Balanced Usability & Annotation Complexity in Interactive Video Semantization

Well-Balanced Usability & Annotation Complexity in Interacti...

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International Conference on Multimedia and Ubiquitous Engineering (MUE)

作者： Yiwei Cao Dominik Renzel Matthias Jarke Ralf Klamma Michael Lottko Georgios Toubekis Michael Jansen Information Systems & Database Technology RWTH Aachen University Aachen Germany RWTH Aachen University Aachen Germany

In the recent years more and more people have begun to edit video files, as technologies are becoming more sophisticated and affordable. Web 2.0 has raised tagging functionality to a growing number of websites such as Flickr and YouTube. However, these services only provide basic video annotation support. In comparison to those well-known services there are many research efforts towards video semantization tools. These tools provide highly precise annotation functionality based on metadata standards such as MPEG-7, but tend to exhibit very complex user interfaces. In this paper we present the design, implementation and evaluation of SeViAnno, an MPEG-7 based interactive semantic video annotation Web platform with the main objective to find a well-balanced trade-off between a simple user interface and video semantization complexity.

关键词： transform coding Semantics Multimedia communication User interfaces Usability Streaming media Communities

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An experimental evaluation of view-based 2D/3D indexing methods

An experimental evaluation of view-based 2D/3D indexing meth...

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IEEE Convention of the Electrical and ELectronic Engineers in Israel

作者： Raluca-Diana Petre Titus Zaharia Françoise Prêteux UMR CNRS 8145-MAP5 Alcatel-Lucent Bell-Labs UMR CNRS 8145-MAP5 Alcatel-Lucent Bell-Labs Evry France Institut TELECOM TELECOM SudParis Evry Cedex France France Mines Paris Tech Paris France

This paper proposes an experimental evaluation of state of the art 2D/3D, view-based indexing methods. The principle of 2D/3D indexing methods consists of describing 3D models by means of a set of 2D shape descriptors, associated with a set of corresponding 2D views (under the assumption of a given projection model). Several experiments were conduced in order to examine the influence of the number of views and of the associated viewing angle selection strategies on the retrieval results. Experiments concern both 3D model retrieval and image recognition from a single view. Three 2D shape descriptors were tested in order to determine which of them is the most suited for such approaches. Results obtained show promising performances, with recognition rates from a single view higher than 80%, which opens interesting perspectives in terms of semantic metadata extraction from still images/videos.

关键词： Three dimensional displays Shape Solid modeling transform coding Principal component analysis Indexing Computational modeling

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Automatic content-based classification of MP3 objects using radial basis function network in surveillance system

Automatic content-based classification of MP3 objects using ...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Yi-Hsing Tsai Chin-Chien Tsai Kun-Ching Wang Digital Signal Processing Technology Department Industrial Technology and Research Institute Hsinchu Taiwan Department of Social Development National Dong Hwa University Hualien Taiwan Department of Information Technology & Communication Shih Chien University Kaohsiung Taiwan

In recent years, the MP3 music objects become the popular type of music file in many internet audio applications, including the surveillance system. But, less attention was received to the content-based classification of audio data. While Cloud Services were blooming, the classification of MP3 music has better more and more important. It is necessary to process much audio data when Cloud Computing. In this paper, we propose an approach to classify MP3 objects based on their energy distribution. The techniques of PCA (principal component analysis) and RBF (radial basis function) network is used to construct the MP3 classifier. Experiment show that the good performance of an MP3 classification system can be met by the proposed method.

关键词： Digital audio players Principal component analysis transform coding Radial basis function networks Feature extraction Training Covariance matrix

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Research and Application of Web-Based Digital Video Resource Library

Research and Application of Web-Based Digital Video Resource...

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International Workshop on Education Technology and Computer Science, ETCS

作者： Li Fei Du Jing Educational Technology Center Tsinghua University Beijing China

ISBN: (纸本)9781424463886;9780769539874

This paper describes the research process of the web-based digital video resource library that developed by the authors. The ¿Digital Video Resource Library¿ project aims to change the traditional video resource management mode, and adopts a new digital, automatic and web-based management mode. It can help teachers and students take full advantage of the resource library, to be good for resource sharing. The project builds up a whole digital video process platform, functions including acquisition, storage, cataloguing, classifying and publication of digital video information on web.

关键词： Software libraries Video compression Video sharing Resource management Optical arrays Educational technology transform coding High speed optical techniques MPEG 4 Standard Project management

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Research on Application of Region-of-Interest in Face Detection

Research on Application of Region-of-Interest in Face Detect...

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International Symposium on Intelligent Information Technology and Security Informatics, IITSI

作者： Deng-feng Zhou Shui-sheng Ye Shao-hua Hu Nanchang Hangkong University Nanchang Jiangxi CN

ISBN: (纸本)9781424467303

The ROI regions in JPEG2000 coding system mostly are defined artificially but it will decrease working efficiency a lot. This paper proposed a new fast face detection method based on AdaBoost and skin color detection, and introduced it into the JPEG2000 coding system. The experiments show that the false alarm rate of the human face detection is obviously lower than AdaBoost.

关键词： Face detection Image coding Skin Humans transform coding Machine learning algorithms Propagation losses Information technology Information security Informatics

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On the Adaptive Coefficient Scanning of JPEG XR/HD Photo

On the Adaptive Coefficient Scanning of JPEG XR/HD Photo

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Data Compression Conference (DCC)

作者： Vanessa Testoni Max H. M. Costa Darko Kirovski Henrique S. Malvar University of Campinas - Unicamp Campinas SP Brazil Univ. of Campinas-Unicamp Campinas Brazil Microsoft Research One Microsoft Way Redmond WA USA Microsoft Research One Microsoft Way Redmond Redmond WA USA

ISBN: (纸本)9781424464258;9780769539942

We explore several local and global strategies for adaptive scan ordering of transform coefficients in JPEG XR/HD Photo. This codec applies a global adaptive scan-order heuristic with respect to an effective localized predictor. The global ordering heuristic, although simple, performs as well as localized techniques that are computationally significantly more complex. We conclude that effective localized prediction not only minimizes but also essentially randomizes coefficient residuals, so that a global statistic is sufficient to deliver near-optimal compression performance.

关键词： High definition video Image coding Codecs Performance gain PSNR transform coding Entropy coding Cities and towns Data compression Testing

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Virtual view synthesis oriented fast depth video encoding algorithm

Virtual view synthesis oriented fast depth video encoding al...

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International Conference on Industrial and Information Systems, IIS

作者： Zongju Peng Mei Yu Gangyi Jiang Yuehou Si Fen Chen Faculty of Information Science and Engineering Ningbo University Ningbo China Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China

A virtual view rendering oriented fast algorithm is proposed to reduce computational complexity of multiview depth video coding. Firstly, the depth image is divided into depth-continuity and depth-discontinuity regions by a macroblock deviation factor. Then, imbalance macroblock mode distribution of depth-continuity regions and effect of image quality degradation in depth-discontinuity regions on virtual view rendering are discussed and analyzed in detail. Finally, the fast algorithm is presented. Two methods are utilized in different regions of depth video. The first method, directly searching SKIP and Intra modes is adopted in smooth regions. The second method which is the same as the JMVM reference software is utilized in depth discontinuous regions. The experimental results show that the proposed algorithm significantly promotes the encoding speed of depth video by 3.91~11.33 times, while maintains high virtual rendering performance in comparison with full search algorithm.

关键词： Rendering (computer graphics) transform coding

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New approach for digital image watermarking and transmission over bursty wireless channels

New approach for digital image watermarking and transmission...

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International Conference on Signal Processing Proceedings (ICSP)

作者： K. Deergha Rao Research and Training Unit of Navigational Electronics Osmania University Hyderabad India

This paper presents a new approach for digital image watermarking and for transmission of watermarked images over bursty wireless channels. In this approach, biorthogonal wavelet transform based method is proposed for digital image watermarking and turbocoded JPEG2000 is proposed for correction of transmission errors due to the bursty wireless channels. The proposed approach is corroborated with implementation results on an image.

关键词： Watermarking Image coding transform coding Wireless communication Decoding Channel coding Discrete wavelet transforms

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