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检索条件"任意字段=Digital Video Compression - Algorithms and Technologies 1996 Conference"

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Successful implementation and use of digital video compression in MMDS systems

Successful implementation and use of digital video compressi...

引用

Proceedings of the 1996 1st Annual conference on Emerging technologies and Applications in Communications

作者： Drury, Gordon M. DigiMedia Vision Ltd Winchester United Kingdom

The latest medium to gain attention in Europe's digital video Broadcasting project is the Multipoint Microwave Distribution System, sometimes also known as Multichannel video Distribution System. Analogue MMDS services already exist in some countries. This paper discusses the regulatory and commercial issues, spectrum planning issues and channel coding.

关键词： Spread spectrum communication

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Subjective assessment of concatenated compression systems

Subjective assessment of concatenated compression systems

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conference on digital compression technologies and Systems for video Communications

作者： Glasman, C Andronov, V Vasilyev, O Litchakov, V ST PETERSBURG INST CINEMA & TELEVIS ST PETERSBURGRUSSIA

ISBN: (纸本)0819423564

Traditional objective measurements are of limited effectiveness in predicting the quality of compressed images. Subjective assessment is the most reliable method of evaluation of compression systems performance now. But subjective assessment is time consuming. That is why it is important to simplify the procedure of subjective measurement. To achieve it one may use the method of paired comparisons. This paper describes applications of the method of paired comparisons in the field of assessment of concatenated compression systems.

关键词： compression concatenation picture quality assessment paired comparisons

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SCALABLE IMAGE compression USING COMBINED WAVELET TRANSFORM AND VECTOR QUANTIZATION

SCALABLE IMAGE COMPRESSION USING COMBINED WAVELET TRANSFORM ...

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conference on digital video compression - algorithms and technologies 1995

作者： PANCHANATHAN, S JAIN, A GAMAZ, N UNIV OTTAWA DEPT ELECT ENGNMULTIMEDIA COMMUN RES LABOTTAWAON K1N 6N5CANADA

ISBN: (纸本)0819417661

In this paper, we propose vector quantization (VQ) based scheme for scalable image compression. Scalability is a generic feature referring to image representation in different sizes (spatial scalability) and/or picture qualities (SNR scalability). VQ is a powerful technique for low bit rate image compression. However the conventional VQ approach does not provide a scalable bitstream. We propose a VQ based algorithm (SVQ) to achieve spatial scalability. In SVQ technique, a pyramidal structure of three layers is built by applying 2D wavelet downsampling filters on the input image. The label stream is then made scalable such that a smaller-size image can be obtained by decoding a portion of the bitstream. This image can be further enhanced in size by progressively decoding the remaining bits. This algorithm ensures partial decodability of VQ labels by using separate codebooks one for each spatial resolution. We then propose a combination of wavelet transform and SVQ technique called WSVQ to exploit the cross-correlations among wavelet sub-bands. Simulation results confirm the substantial reductions in bit rate and superior subjective image quality at each spatial resolution using the proposed algorithm, at a significantly reduced computational complexity.

关键词： Image compression Wavelets Wavelet transforms Spatial resolution Quantization Image quality Image resolution Signal to noise ratio Image enhancement Image filtering

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The Role of Optical Flow in Automated Quality Assessment of Full-Motion video 40

The Role of Optical Flow in Automated Quality Assessment of ...

引用

conference on Applications of digital Image Processing XL

作者： Harguess, Josh Shafer, Scott Marez, Diego Space & Naval Warfare Syst Ctr Pacific 53560 Hull St San Diego CA 92152 USA

ISBN: (数字)9781510612501

ISBN: (纸本)9781510612501;9781510612495

In real-world video data, such as full-motion-video (FMV) taken from unmanned vehicles, surveillance systems, and other sources, various corruptions to the raw data is inevitable. This can be due to the image acquisition process, noise, distortion, and compression artifacts, among other sources of error. However, we desire methods to analyze the quality of the video to determine whether the underlying content of the corrupted video can be analyzed by humans or machines and to what extent. Previous approaches have shown that motion estimation, or optical flow, can be an important cue in automating this video quality assessment. However, there are many different optical flow algorithms in the literature, each with their own advantages and disadvantages. We examine the effect of the choice of optical flow algorithm (including baseline and state-of-the-art), on motion based automated video quality assessment algorithms.

关键词： video Optical flow Image quality video compression Cameras Motion estimation video surveillance Image compression Image processing

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Comparative Analysis of Half toning algorithms for digital Watermarking 18

Comparative Analysis of Half toning Algorithms for Digital W...

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18th conference of Open-Innovations-Association-FRUCT and Seminar on Information Security and Protection of Information Technology (ISPIT)

作者： Makarov, Anton Yakovleva, Elena St Petersburg State Univ St Petersburg Russia

ISBN: (纸本)9789526839721

Steganography is the art of hiding infonnation within other infonnation in such a way that it is hard or even impossible to tell that it is there. The most popular carriers for steganography are the redundant data of multimedia, such as image, video, audio, and text digital image. digital watermarking is the practice of hiding a message about a digital image within that image. Modern halftoning algorithms for obtaining a digital binarized image, applicable as a watennark, are discussed. The description of the steganographic system and results of halftoning of the grayscale images are presented. The algorithms of embedding of the halftoned image into grayscale image using the secret key, which provides theoretical and practical secrecy of the stegosystem, and detection, are described. The degradation of the embedded halftoned image by JPEG compression is estimated. From the results of calculations of the chosen distortion measures it has been found that digital watermarks created by using block-based halftoning algorithm has a smallest degradation by JPEG compression, than those obtained by other half toning algorithms. Thus, the proposed steganographic system provides desired stability to compression and secrecy.

关键词： Steganography

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Segmentation-based coding of motion fields for video compression

Segmentation-based coding of motion fields for video compres...

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digital video compression: algorithms and technologies 1996

作者： Baker, Matthew S. Maeder, Anthony J. Queensland Univ. of Technology Ballarat VIC Aust

ISBN: (纸本)0819420425

In this paper, a motion field segmentation scheme for video compression is presented. A split- and-merge segmentation technique and linear regression are used to segment the field and an affine motion model is used to describe the movements of the regions. In the regression, a linearization of the displaced frame difference is minimize directly. The results are compared with block-based motion estimates and MPEG style coding.

关键词： video signal processing

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HIGH-SPEED A/D AND D/A INTERFACE FOR PCS WITH APPLICATIONS IN IMAGE-PROCESSING

HIGH-SPEED A/D AND D/A INTERFACE FOR PCS WITH APPLICATIONS I...

引用

conference on video Communications and PACS for Medical Applications

作者： VLAICU, A MECIU, E IACOB, S TECH UNIV CLUJ NAPOCA DEPT COMMUNR-3400 CLUJ NAPOCAROMANIA

ISBN: (纸本)0819412236

The paper is concerned with theoretical and practical problems related to real time acquisition and storage of standard PAL/SECAM images and also with developing fast software algorithms for digital image processing. A first section of the paper comprises the description of the block diagram of the PC plug-in conversion unit and a second one refers to practical image data compression and basic image processing algorithms.

关键词： Data conversion Image processing video Data compression Algorithm development Image compression Data storage digital image processing Image storage Software development

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MMDS transmitter for high data rate digital video delivery

MMDS transmitter for high data rate digital video delivery

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1st Annual conference on Emerging technologies and Applications in Communications

作者： Urban, D INFORMAT TRANSMISS SYST CORP MCMURRAYPA 15317

ISBN: (纸本)0818675853

Wireless cable, including MMDS, ITFS, and MDS, is a terrestrial television broadcast service at 2.1 and 2.5 to 2.7 GHz. A total of 33 channels are available, each 6 MHz wide. By utilizing MPEG2 video compression and spectrally efficient digital modulation, the number of programs delivered in this bandwidth can be dramatically increased. This paper describes the method by which the programming increase is achieved. The resulting increase in spectral efficiency does come at the cost of increased stringency in transmitter specifications. This paper describes the new digital MMDS transmitter specifications and the recently developed technology that allows these tighter specifications to be met.

关键词： Image compression

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Real time MPEG-1 video transmission over local area networks

Real time MPEG-1 video transmission over local area networks

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conference on digital compression technologies and Systems for video Communications

作者： Delopoulos, A Kalogeras, D Alexopoulos, V Kollias, S NATL TECH UNIV ATHENS DEPT ELECT & COMP ENGNDIV COMP SCIATHENSGREECE

ISBN: (纸本)0819423564

In this work is presented the architecture of an MPEG-1 stream transmission system appropriate for point-to-point transfer of live video and audio over TCP/IP local area networks. The hardware and software modules of the system are presented as well. Experimental results on the statistical behavior of the generated and transmitted MPEG-1 stream are quoted.

关键词： video Computer programming Local area networks video coding Multiplexers Analog electronics Computer architecture Multiplexing Network architectures video processing

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Predicting the visibility of dynamic DCT distortions in natural videos 38

Predicting the visibility of dynamic DCT distortions in natu...

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conference on Applications of digital Image Processing XXXVIII

作者： Evert, Jeremy P. Alam, Md Mushfiqul Chandler, Damon M. Southwestern Oklahoma State Univ Weatherford OK 73036 USA Oklahoma State Univ Stillwater OK 73036 USA Shizuoka Univ Dept Elect & Elect Engn Hamamatsu Shizuoka Japan

ISBN: (纸本)9781628417654

compression has enabled years of exponential growth in global video consumption, providing video everywhere, with few perceptible artifacts. Automated video Quality Assessment (VQA) is an enabler of compression. We present data showing video contrast affects on artifact visibility. Based on our data, we propose a contrast-gaincontrol VQA algorithm, with target spatiotemporal property weighting, and using our data to tune existing VQA algorithms for improved artifact threshold predictions. This paper provides much needed data on natural video mask contrast and artifact visibility, and provides important insights for how VQA algorithms can be improved to better predict video quality in the high-quality regime.

关键词： Natural-video masking temporal masking compression artifact visibility video quality assessment artifact visibility prediction

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