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检索条件"主题词=transform coding"

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Software architecture of advanced features DVB TV receiver case study DVR application

Software architecture of advanced features DVB TV receiver c...

引用

International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： A. Zivkovic N. Teslic V. Mihic T. Maruna U. Strohbeck Micronas NIT GmbH Novi Sad Serbia Computer Engineering on Faculty of Technical Science Novi Sad Fruskogorska Serbia Micronas NIT GmbH Munich Germany

In this paper SoC (system on chip) solution for DVB receiver is presented with case study DVR application. Main purpose of this software package is recording parallel streams coming from the transport stream interface (TSI) unit to the hard disk drive (HDD), and retrieving stored data from the HDD, featuring random access functionality.

关键词： Software architecture Digital video broadcasting TV receivers Video compression Digital TV Streaming media transform coding US Department of Transportation Application software Cryptography

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On turbo-compression and modeling of black and white images

On turbo-compression and modeling of black and white images

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： I. Deslauriers J. Bajcsy McGill University Montreal QUE Canada

This paper considers lossless compression of black and white images using recently developed distributed turbo compression techniques. An empirical study of image pixel statistics is initially conducted in order to apply turbo compression algorithms to distributed compression of image rows. In particular, it is noted that while the entropy of the pixels throughout the image does not vary much, the distribution and conditional distributions of pixel values are nonstationary. Corresponding compression bounds are noted, appropriate coding schemes based on turbo-codes are developed and simulation results are reported.

关键词： Image coding Pixel Entropy Turbo codes Probability distribution Councils Statistical distributions Compression algorithms Parity check codes transform coding

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Early resynchronization, error detection and error concealment for reliable video decoding

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International Conference on Communication Technology (ICCT)

作者： Shaoshuai Gao Guofang Tu School of Information Science & Engineering Graduate School of Chinese Academy of Sciences China

ISBN: (纸本)7563506861

In this paper we proposed a robust video decoding scheme using early resynchronization, error detection (ED) and error concealment (EC). Many video coding standards such as H.263+ and MPEG-2 make the compressed video signals more vulnerable to channel errors because of error propagation due to using variables length coding (VLC). Channel errors cannot only result in false decoding of current bits but also make the decoder lose synchronization. The data between the errors and next resynchronization marker (RM) will be discarded even if they are not corrupted by channel errors. Early resynchronization can retrieve unaffected data between the errors and next RM, which can greatly reduce error propagation due to using VLC. We combined early resynchronization with deliberately designed ED and EC technologies and tested three early resynchronization schemes in our simulation. It has been found that the third scheme can give the best tradeoff between the final reconstructed image quality and searching times.

关键词： Decoding Video compression Error correction codes Robustness Video coding transform coding Information retrieval Image quality Image coding Information science

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Security for Video Surveillance with Privacy

Security for Video Surveillance with Privacy

引用

International Conference on Internet Technology and Applications (iTAP)

作者： Jie Shen XiaoYu Zheng Sch. of Comput. Sci. & Eng. Univ. of Electron. Sci. & Technol. of China Chengdu China Hydro-China Chengdu Eng. Corp. Chengdu China

In this paper, a video surveillance system is designed to provide means for ensuring privacy information security and offer the capability of proving authenticity. First, a real-time scrambling approach to conceal video information is presented. The sign of transform coefficients for intra macro- block is pseudo-randomly flipped, and so only the authorized persons are allowed to correctly decode the code-stream. At the same time, a method for embedding digital watermark into videos is proposed. The relationship among the DC components in several successive frames is used for hiding data. Simulation results based on MPEG-4 show that a good level of security is provided by the end-to-end security scheme. Furthermore, this is achieved with a small impact on coding performance and computation complexity.

关键词： Privacy Watermarking Video surveillance Streaming media Receivers transform coding

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Copy move forgery detection based on LBP

Copy move forgery detection based on LBP

引用

IEEE Signal Processing and Communications Applications (SIU)

作者： Güzin Ulutaş Mustafa Ulutaş Vasif V. Nabiyev Bilgisayar Mühendisliği Bölümü Karadeniz Teknik Üniversitesi Trabzon Turkey

Increase on the availability of the image editing tools makes it easy to create digital forgeries. More popular forgery in image manipulation is the copy move forgery where part of an image is copied into another location to hide an object. The methods that are used to detect the copy move forgery in images have a drawback. Length of the feature vector that represents an image block affects the time complexity of the detection algorithm. In this work, we use the local binary patterns (LBP) to represent an image block. LBP is used to reduce the dimension of the features. Experimental results also show that the method can detect the duplicated regions even when an image was distorted by JPEG compression or Gaussian blurring.

关键词： Forgery transform coding Art Detection algorithms Digital images Robustness Abstracts

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Comparison between JPEG2000 and H.264 for digital cinema

Comparison between JPEG2000 and H.264 for digital cinema

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Boxin Shi Lin Liu Chao Xu Key Laboratory of Machine Perception (Ministry of Education) Peking University Beijing China

JPEG2000 and H.264 are the latest image and video coding standards respectively. Digital cinema is a new kind of application for super high definition video. The DCI (digital cinema initiative) specification published in 2005 has selected JPEG2000 instead of H.264 as the video coding standard for digital cinema. It shows that JPEG2000 has a better performance in the field of super high definition video coding. Until now, only a few basic tests have been done to compare between JPEG2000 and H.264. Moreover, the test resolutions and characteristics of input sequences are very limited. In this paper, based on JPEG2000, H.264 intra and inter-frame coding, we compare the coding efficiency and subjective image quality on multiple series of test sequences from low to super high resolutions. The experiment results demonstrate some regularity for JPEG2000 and H.264 video coding, and reveal JPEG2000 is more suitable for digital cinema.

关键词： transform coding Bit rate Motion pictures Encoding Image resolution Image coding PSNR

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A Detection Method Research for Data Hiding Based on Markov Chain

A Detection Method Research for Data Hiding Based on Markov ...

引用

International Conference on Computational and Information Sciences (ICCIS)

作者： Zhu Li Zhao Huimin Industrial Training Center Guangdong Polytechnic Normal University Guangzhou China College of Electronics and Information Guangdong Polytechnic Normal University Guangzhou China

For theoretical disadvantages of detecting images signal based on independent and identically distributed (i.i.d.) models used for hiding data, a novel detection method is provided based on Markov chain in the paper. The Markov chain model provides an analytically tractable framework whose predictions are consistent with the performance of practical hiding data algorithms that account for spatial dependencies. Numerical results are provided for image information hiding techniques of using SS, QIM, and LSB, respectively.

关键词： Data models Markov processes transform coding Silicon Benchmark testing Computational modeling Distributed databases

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Efficient and reliable dynamic quality control for compression of compound document images

Efficient and reliable dynamic quality control for compressi...

引用

IEEE International Conference on Image Processing

作者： A. Said Hewlett-Packard Laboratories Palo Alto CA USA

Compound images contain a mixture of natural images, text, and graphics. They need special care in the use of compression because text and graphics cannot withstand the significant distortion that is acceptable for natural images. One solution is to identify the areas that need to have higher settings in a dynamic quality control scheme, as supported by JPEG-SPIFF and JPEG 2000. We propose a scheme to identify those regions using a discrimination function that works with a non-linear transform to reliably identify edges, and at the same time avoid false positive detection on regions with complex patterns. It does so by exploiting the properties of histograms of coefficients of this block transform, and their entropy function, which we show can be computed efficiently via table look-up. Experimental results demonstrate the performance of the new scheme, compared to other methods in the literature.

关键词： Quality control Image coding Image edge detection Graphics transform coding Entropy Printing Laboratories Histograms Document image processing

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Is MPEG encryption by using random list instead of zigzag order secure?

Is MPEG encryption by using random list instead of zigzag or...

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Lintian Qiao K. Nahrstedt Ming-Chit Tam Department of Computer Science University of Illinois Urbana-Champaign Urbana IL USA Institute of System Science NUS Singapore

This paper discusses the problems of the MPEG video encryption algorithm by using a random permutation list instead of a zigzag order within the MPEG compression process. We show that (1) the encryption method causes a significant size increase of the MPEG video stream, hence defeats the purpose of compression, and (2) the encryption method can not withstand the known-plaintext attack, therefore, should not be considered as secure. We also discuss other solutions to achieve secure, time-efficient, and size-preserving MPEG-video encryption.

关键词： Cryptography transform coding Video compression Streaming media Video on demand Videoconference Data security Digital multimedia broadcasting Computer science Multimedia communication

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Mixed content image compression by gradient field integration

Mixed content image compression by gradient field integratio...

引用

IEEE International Conference on Image Processing

作者： Peter Ilbery David Taubman Andrew Bradley University of New South Wales Sydney Australia University of Queensland Brisbane Australia

Sketch based image coding decomposes an input image into a piece-wise smooth approximation image and a residual image. Image compression by gradient field integration follows this model, but differs by generating the approximation image from gradient data along edge contours and regularly sampled low resolution image data. This allows direct and efficient calculation of an approximation image which is smooth between edges. In this paper, we describe the image compression by gradient field integration approach, together with a low complexity implementation intended for near visually lossless compression of mixed content images. The implementation uses gradient field integration by scanline convolution, simple edge data extraction, DCT residual image coding and is block-based; it is suited to compression of images containing sharp edges occurring along pixel borders. Compression results are provided indicating potential gains from this method.

关键词： Image coding Image segmentation Page description languages transform coding Printers Image resolution Hardware Image generation Shape Pixel

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