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检索条件"主题词=transform coding"

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A Nonlinear Detector for Optimal DCT-Domain Watermark Detection

A Nonlinear Detector for Optimal DCT-Domain Watermark Detect...

引用

International Conference on Electrical and Control Engineering (ICECE)

作者： Fabing Duan Ying Wang Institute of Complexity Science Qingdao University of China Qingdao China

A nonlinear detector is proposed for optimal DCT-domain watermark detection, which comes from a watermarking embedding algorithm based on the absolute value reordering rule of DCT coefficients. The performances of the nonlinear detector versus the linear detector, described by a measure of deflection coefficient, are evaluated in the watermark detection. Experimental results demonstrate that the proposed nonlinear detector is robust to some common attacks on the marked image, including JPEG compression, median filtering and addition of Gaussian noise.

关键词： Watermarking Detectors Discrete cosine transforms Robustness PSNR Signal processing algorithms transform coding

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Low-Complexity Heterogeneous Video Transcoding by Motion Vector Clustering

Low-Complexity Heterogeneous Video Transcoding by Motion Vec...

引用

International Conference on Information Science and Applications (ICISA)

作者： Yoonjeong Shin Namrye Son Nguyen Dinh Toan Gueesang Lee Department of Computer Engineering Gwangju University Gwangju South Korea Primary Research Center Mokpo National University Muan South Korea School of Electronics and Computer Engineering Chonnam National University Gwangju South Korea

ISBN: (纸本)9781424459421

The recently developed video compression standard, H.264/AVC surpasses the performance of previous video standards, such as MPEG-2, MPEG-4(part2), and H.263 and is therefore expected to be selected as the video standard for most digital video applications. The widely distributed infrastructure, however, continues to use the previous standards. Heterogeneous video transcoding offers a significant key to the resolution of this problem. This paper suggests a new algorithm for H.264/AVC to MPEG-2 transcoding that uses motion vector clustering to reduce the computation time with no loss of quality. Such a clustering method can reduce the number of candidate motion vectors that are gathered during the H.264 decoding stage. These candidate motion vectors consider the correlation between the direction and distance of the motion vectors in the variable blocks in H.264/AVC. The candidate motion vector that has the least distortion is then selected in the MPEG-2 encoder. The MPEG-2 encoder can therefore use the best motion vector without carrying out computations for motion estimation. The experimental results show that the proposed method can maintain a good level of video quality while reducing the computational complexity by a considerable 64%, on average, compared to a cascade transcoder.

关键词： Transcoding Video compression Standards development Automatic voltage control transform coding Clustering algorithms Clustering methods Decoding Motion estimation Computational complexity

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GoP-based fluid Markovian modelling of video traffic

GoP-based fluid Markovian modelling of video traffic

引用

International Conference on Communications and Networking, ComNet

作者： Wassim Abbessi Hédi Nabli Ecole Nationale des Sciences de I''Informatique Mannouba Tunisia Faculté des Sciences de Sfax Sfax Tunisia

The constant evolution of video standards and technologies and the important growth of the amount of video data in networks leads to a need to build new models for video sources. In this paper, we specify a Markovian fluid model based on GoPs (Group of Pictures) that creates a video source descriptor. This descriptor can be used to compute the loss rate observed when transmitting the video via the network. We show also how to build an artificial video traffic having the same statistical characteristics of the original source.

关键词： Streaming media Markov processes Computational modeling Mathematical model transform coding Data models Transient analysis

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BYPASS and PARALLEL modes for JPEG2000 compression of natural imagery

BYPASS and PARALLEL modes for JPEG2000 compression of natura...

引用

IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Eric J. Balster David L. Lucking Department of Electrical and Computer Engineering Kettering Laboratory University of Dayton Dayton OH USA Air Force Research Laboratory OH USA

In this paper, the BYPASS and PARALLEL modes of JPEG2000 are investigated and implemented in a software compression system for verification and validation. BYPASS and PARALLEL modes in JPEG2000 are options in the standard to facilitate fast compression and parallel computation for embed ded applications. Our results show minimal performance degradation in both BYPASS and PARALLEL modes, where BYPASS mode degrades PSNR performance by 0.1 dB, PARALLEL mode degrades performance by 0.15 dB, and utilizing both BYPASS and PAR ALLEL modes results in a performance degradation of 0.25 dB, on average. The implementation of the different modes results in a com pression speedup of approximately 10% in BYPASS mode, and a potential 3x speedup in PARALLEL mode, if independent coding passes are executed concurrently.

关键词： transform coding Image coding Channel coding Materials requirements planning transforms Decoding

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Comparison of Multidimensional Data Access Methods for Feature-Based Image Retrieval

Comparison of Multidimensional Data Access Methods for Featu...

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International Conference on Pattern Recognition

作者： Serdar Arslan Ahmet Saçan Esra Açar I. Hakki Toroslu Adnan Yazıcı TUBITAK Space Technologies Research Institute Ankara Turkey Science and Health Systems Drexel University Philadelphia PA USA Dept. of Computer Engineering Middle East Technical University Ankara Turkey

ISBN: (纸本)9781424475421

Within the scope of information retrieval, efficient similarity search in large document or multimedia collections is a critical task. In this paper, we present a rigorous comparison of three different approaches to the image retrieval problem, including cluster-based indexing, distance-based indexing, and multidimensional scaling methods. The time and accuracy trade-offs for each of these methods are demonstrated on a large Corel image database. Similarity of images is obtained via a feature-based similarity measure using four MPEG-7 low-level descriptors. We show that an optimization of feature contributions to the distance measure can identify irrelevant features and is necessary to obtain the maximum accuracy. We further show that using multidimensional scaling can achieve comparable accuracy, while speeding-up the query times significantly by allowing the use of spatial access methods.

关键词： Accuracy Indexing transform coding Open wireless architecture Measurement Feature extraction

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Research of Flex-based WebGIS application

Research of Flex-based WebGIS application

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International Conference on Networked Computing and Advanced Information Management (NCM)

作者： ZuKuan Wei Jae-Hong Kim JingRong Zhao School of Computer Science and Engineering University of Electronic Science and Technology Chengdu China Department of Computer & Information Engineering YoungDong University Yeongtong gu Chungcheongbuk South Korea

Analyze the implementations of the current traditional WebGIS, such as CGI, Server API and ActiveX, summarize their advantages and disadvantages. Through these, propose three urgent problems existing in the traditional WebGIS. The WebGIS based on Flex technology can just remedy these defects. Base on the comprehensive analysis of the characteristic of Flex, the paper builds a demo version of oilfield visual management system as a practical system, and using the tile cache to improve system efficiency. Research results show that, development of WebGIS based on Flex is a very good way.

关键词： Browsers Navigation Servers transform coding

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An efficient realization of forward integer transform in H.264/AVC intra-frame encoder

An efficient realization of forward integer transform in H.2...

引用

International Conference on Embedded Computer Systems: Architectures, Modeling and Simulation (IC-SAMOS)

作者： Muhammad Nadeem Stephan Wong Georgi Kuzmanov Computer Engineering Laboratory Delft University of Technnology Delft Netherlands

The H.264/AVC intra-only frame encoder, for its excellent encoding performance, is well-suited for image/video compression applications such as Digital Still Camera (DSC), Digital Video Camera (DVC), Television Studio Broadcast and Surveillance video. The forward integer transform is an integral part of the H.264/AVC video encoder. In this paper, for image compression applications running on battery-powered electronic devices (such as DSC), we propose a low-power, area-efficient realization of the forward integer transform. The proposed solution reduces the number of operations by more than 50% (30 vs. 64) and consumes significantly less dynamic power when compared with existing state-of-the-art designs for the forward integer transform. For video compression applications such as Television Studio Broadcast or Surveillance Videos, where throughput is more important, we propose a low-latency, area-efficient realization of the forward integer transform unit in the intra frame processing chain. With the proposed solution, the effective latency for forward integer transform is drastically reduced, as the processing unit is no longer on the critical path of the intra-frame processing chain. Moreover, the proposed solution requires half the numbers of operations for its hardware implementation, when compared with existing state-of-the-art designs for forward integer transform.

关键词： transforms Automatic voltage control Image coding Hardware transform coding Pixel Prediction algorithms

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Compressed signature for video identification

Compressed signature for video identification

引用

Picture coding Symposium, PCS

作者： N. Sprljan P. Brasnett S. Paschalakis Mitsubishi Electric Research and Development Centre Europe Guildford UK

This paper presents a new application-specific lossless compression scheme developed for video identification descriptors, also known as video fingerprints or signatures. In designing such a descriptor, one usually has to balance the descriptor size against discriminating power and temporal localisation performance. The proposed compression scheme alleviates this problem by efficiently exploiting the temporal redundancies present in the video fingerprint, allowing highly accurate fingerprints which also entail low transmission and storage costs. In this paper we provide a detailed description of our compression scheme and a comparative evaluation against well known state-of-the-art generic compression tools.

关键词： transform coding MPEG 7 Standard Feature extraction Histograms Redundancy Entropy coding

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Play estimation using multiple 1D degenerated descriptions of MPEG motion compensation vectors

Play estimation using multiple 1D degenerated descriptions o...

引用

International Conference on Computer Sciences and Convergence Information Technology (ICCIT)

作者： Kyota Aoki Utsunomiya University Utsunomiya Tochigi Japan

We have large needs for estimating plays in sport videos. Plays in sports are described as the motions of players. This paper proposes the play retrieving method based on the motion compensation vector in MPEG sports videos. In MPEG videos, there are motion compensation vectors. Using the motion compensation vectors, we don't need to estimate the motion vectors between adjacent frames. This leads to decrease the huge computations about motion estimations. This work uses the 1D degenerated descriptions of each motion image between 2 adjacent frames. Connecting the 1D degenerated descriptions on time direction, we have the space-time image. This space-time image describes a sequence of frames as a 2-dimensional image. Using this space-time image, this work shows the method to retrieve a small number of plays in huge number of frames. Our experiment records 0.63 as recall, 0.84 as precision and 0.70 as F-measure in 139 plays in 132503 frames.

关键词： Videos Motion compensation transform coding Image color analysis Games Correlation Pixel

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A higher-order prediction method of spatial cues based on Bayesian Gradient model

A higher-order prediction method of spatial cues based on Ba...

引用

IEEE International Conference on Wireless Communications, Networking and Information Security (WCNIS)

作者： Cheng Zhou Ruimin Hu Heng Wang School of Computer Science Wuhan University of China Wuhan China National Engineering Research Center for Multimedia Software Wuhan University of China Wuhan China National Engineering Research Center for Multimedia Software Wuhan University of China Xi'an China

ISBN: (纸本)9781424458509;9781424458493

The derivation of spatial cues representing source localization information is a typical component of multichannel spatial audio coders such as EAAC+ and MPEG Surround. Efficient compression of spatial cues based on the inter-frame difference distribution of spatial cues is investigated. Using a Bayesian Gradient model, the inter-frame correlations can be predicted more accurately. Results show that the proposed higher-order prediction method for spatial cue compression achieves about 20% bit-rate reduction with respect to the inter-freq differential coding method used in MPEG Surround.

关键词： Prediction methods Bayesian methods Predictive models transform coding Quantization Codecs Bit rate Computer science Internet Wireless communication

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