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A Scheduling and Management Algorithm about Proxy Based on AFEC

A Scheduling and Management Algorithm about Proxy Based on A...

引用

International Conference on MultiMedia and Information Technology, MMIT

作者： Tan Yubo Han Ping Chen Liang Tao Yang College of Information Science and Technology Henan University of Industrial Technology Zhengzhou Henan China College of Information Science and Technology Henan University of Industrial Technology Zhengzhou Henan P.R.China Lab. of Battle Nanchang Military Academy Nanchang P.R.China

ISBN: (纸本)9781424466016;9780769540085

The proxy is one of the important parts of the Internet. The proxy can reduce the data flow and release the load of the servers. Because of the unpredictable problem of the network, the proxies have great influence on the video QoS. Through the perfect algorithm, within the acceptable scope, the proxy can improve the performance of the system. In the video service system, the proxy can improve the scalability of the system and improve the QoS. In this paper, a new cache replace strategy based on AFEC is proposed, which can employee the characteristics of the proxy and can improve the system performance within the normal resource.

关键词： Scheduling algorithm transform coding Web server Internet Job shop scheduling Educational institutions Electronic mail Network servers Video compression Data compression

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Bayesian watermark detection and new perceptual mask based on a spatially weighted Total Variation image prior

Bayesian watermark detection and new perceptual mask based o...

引用

IEEE International Workshop on Information Forensics and Security (WIFS)

作者： Antonis Mairgiotis Nikolaos Galatsanos Department of Computer Science University of Ioannina (UoI) Ioannina Greece Department of Electrical Engineering University of Patras Rio Greece

In this work we propose a class of bayesian watermark detectors based on a spatially weighted Total Variation (TV) image model. The inherent flexibility of the proposed prior in modelling local image variations, provides us with a novel spatial mask capable to perceptually shape the embedded watermark. We also propose methods to estimate the parameters of the proposed mask, creating watermarks with more energy and in consequence with improved robust properties. Numerical experiments are presented that demonstrate the performance of our proposal with regard to detection sensitivity and the superiority of the mask compared with other existing spatial masking schemes.

关键词： Watermarking Detectors Robustness Bayesian methods Additives transform coding TV

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An analysis of quality factor on image steganalysis

An analysis of quality factor on image steganalysis

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The International Conference on Informatics and Systems (INFOS)

作者： Zohaib Khan Atif Bin Mansoor Department of Avionics Engineering National University of Sciences and Technology Pakistan

ISBN: (纸本)9781424458288;9789774033964

Internet has emerged as a popular medium of communication, not only for common people but also for criminals. Various modes of covert communication are adopted by such elements. Steganography hides the information in digital images without changing their visual perception. These images can then be transferred over internet, without causing any suspicion to an observer. Steganalysis techniques inspect the images and detect the presence of hidden messages. In this paper, we have investigated the effect of quality factor of JPEG images on steganalysis using Discrete Cosine transform. Features are extracted in Discrete Cosine transform domain using higher order statistics, and subsequently a Fisher Linear Discriminant classifier is trained using different clean and steganographic images at different JPEG compression ratios i.e., quality factor. The quantitative results of experiments demonstrate that a classifier trained on particular quality factor gives better detection accuracy for images compressed with the same or a lower quality factor, but gives degraded performance of detection for images compressed with higher quality factor. This inference can aid in developing improved quality independent steganalysis mechanisms.

关键词： Image analysis Q factor Image coding Internet Steganography transform coding Discrete cosine transforms Digital images Visual perception Feature extraction

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A robust image watermarking based on DCT by Arnold transform and spread spectrum

A robust image watermarking based on DCT by Arnold transform...

引用

International Conference on Advanced Computer Theory and Engineering, ICACTE

作者： Ling Lu Xinde Sun Leiting Cai Department of Computer Science and Application Zhengzhou Institute of Aeronautical Industry Management Zhengzhou China Transport Department Zhengzhou Railway Bureau Zhengzhou China

ISBN: (纸本)9781424465392;9781424465422

In this paper a robust image watermarking algorithm based on DCT by Arnold transform and spread spectrum is proposed. The watermarking image is scrambled by Arnold transform to enhance its privacy. The specific second high-frequency DCT coefficients of the original image are selected effectively according to Human Visual System (HVS) and characteristic of digital image processing and then encrypted watermarking is embedded into DCT coefficients selected by spread spectrum. The experimental results show that the algorithm is more robust and more effective.

关键词： Cryptography Shearing Robustness Noise Image coding Filtering transform coding

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A general parametric model for perceptual video quality estimation

A general parametric model for perceptual video quality esti...

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IEEE International Workshop Technical Committee on Communications Quality and Reliability, CQR

作者： Jose Joskowicz J. Carlos López López Ardao Facultad de Ingeniería Universidad de la Republica Montevideo Uruguay ETSE Telecomunicación Vigo Spain

In this paper a general parametric model is proposed which provides estimation for the perceived quality of video, coded with different codecs, at any bit rate and display format. The proposed model takes into account video content, using an objective estimation of the spatial-temporal activity, based on the average SAD (Sum of Absolute Differences) for the clip. Studies were made for more than 2000 processed video clips, coded in MPEG-2 and H.264/AVC, in bit rate ranges from 25 kb/s to 12 Mb/s, in SD, VGA, CIF and QCIF display formats. The results shows that the proposed model fits very well to the perceived video quality, in any combination of codec, bit rate and display format.

关键词： Mathematical model Bit rate transform coding Codecs Estimation Equations

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Digital image watermarking robust to geometric attacks based on wavelet domain

Digital image watermarking robust to geometric attacks based...

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International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： Na Ma Qiang Zhang Ying Li Key Laboratory of Advanced Design and Intelligent Computing Ministry Education Province Dalian University Dalian China

This paper presents a new wavelet domain watermarking method, the carrier image using wavelet decomposition. After the Walsh transform low frequency wavelet coefficients, calculated by block adaptive embedding strength, modify the wavelet coefficients of each block, and then do singular value decomposition (SVD), repeat on embedded watermark in the singular value. Fractional part of the anti-transformed image is saved, correction of the watermarked image can be accurately extracted watermark. The experimental results demonstrate that the proposed algorithm can effectively resist cutting, scaling, translation and other geometric attacks, attacks in general are also robust.

关键词： Discrete wavelet transforms Robustness Chaos transform coding

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Digital image watermarking scheme based on histogram in DWT domain

Digital image watermarking scheme based on histogram in DWT ...

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International Conference on Digital Content, Multimedia Technology and its Applications (IDC)

作者： Xiao-Chen Yuan Chi-Man Pun Department of Computer and Information Science University of Macau Macao China

A robust and geometric invariant digital watermarking scheme for gray-level images is proposed in this paper. The scheme carries out watermark embedding and extraction based on histogram in DWT domain. For watermark embedding, the original image is decomposed into the approximation and details sub-bands. Pixels of the approximation sub-band are grouped into m blocks, each of which has the same number of intensity-levels, thus the block histogram is generated; with the block histogram, pixels are moved to form a specific pattern in the intensity-level histogram distribution, indicating the watermark. For watermark extraction, the watermarked image is decomposed into the approximation and details sub-bands; then the pixels in the approximation sub-band are grouped into blocks in the similar manner. According to the histogram distribution in each block, the watermark is extracted. Experimental results show that the proposed scheme is highly robust against JPEG compression, geometric attacks and some common signal processing.

关键词： Image coding Discrete wavelet transforms Fractals Robustness Cryptography Pixel transform coding

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The design and implementation of bluetooth video surveillance devices

The design and implementation of bluetooth video surveillanc...

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Congress on Image and Signal Processing, CISP

作者： Yang Yu Xiaohui Duan Shuaiqi Wang Bingli Jiao School of Electronic Engineering and Computer Science Peking University Beijing China

Portable wireless video surveillance devices have been widely used. In this paper we designed and implemented a video surveillance device based on embedded system with bluetooth hardware. Customized communication prot... 详细信息

关键词： Servers Bluetooth Protocols Streaming media transform coding Hardware Video surveillance

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Shape Matching Using the Included Angle Histogram of Vectors

Shape Matching Using the Included Angle Histogram of Vectors

引用

Chinese Conference on Pattern Recognition (CCPR)

作者： C. Zhang V. Prinet Institute of Automation Chinese Academy and Sciences Beijing China

We propose a novel shape descriptor-Included Angle Histogram -for correspondence recovery of graphic vertex and shape-based object recognition. After detecting points local maximal curvature with and the center point of the contour, we construct vectors from the center point to the curvature points. Consequently the point descriptor can be obtained through computing the histograms of included-angles between this vector to the others. The descriptor at each point captures the distribution over corresponding points in the relative position, thus the global shape can be summarized by the combination of each local descriptor. It's invariant to geometrical transformation, eg. rotation, translation, scale and symmetry. The approach has been tested on the well known KIMIA99 database and MPEG-7 CE-Shape-1 database. The image retrieval results demonstrate that our descriptor is practical in shape matching. Moreover, compared to the other methods, it's more efficient in time-consuming.

关键词： Shape Databases transform coding Histograms Image edge detection Pattern recognition Computer vision

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A improved video watermarking scheme based on spread-spectrum technique

A improved video watermarking scheme based on spread-spectru...

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International Conference on Networking and Digital Society, ICNDS

作者： Luo Wei College of Computer Science and Communication Engineering Guizhou University Guiyang China

ISBN: (纸本)9781424451623;9781424451616

This paper presents a improved video watermarking technology based on the MPEG-4 standard and the spread-spectrum technique. The watermarks are embedded in the luminance's DCT direct current coefficient of the video's `I' frames. It need not to decode fully when the watermarking is embedded and extracted. As a result, the complication of operation is predigested and the capability of real time is improved. Furthermore, experimental results show that because the watermark is embedded in the luminance's DCT direct current coefficient rather than in the chroma's DCT direct current coefficient, the video effect is distorted less, and the watermark is still steady.

关键词： Watermarking Spread spectrum communication Video compression transform coding Robustness Videoconference MPEG 4 Standard Data mining Educational institutions Computer science

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