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

共 515 条记录，以下是131-140 订阅

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MPEG2Tool: a tool kit for the study of MPEG-2 video transport over ATM-based networks

MPEG2Tool: a tool kit for the study of MPEG-2 video transpor...

引用

digital video compression: algorithms and technologies 1996

作者： Luo, Wenjun El Zarki, Magda Univ. of Pennsylvania Princeton NJ USA

ISBN: (纸本)0819420425

Providing high bit rate real-time video services has been a major driving factor in the advancement of high speed networking technology such as ATM based BISDN. In this paper, we describe MPEG2Tool, an X-window-based software implementation of the MPEG-2 video compression algorithm with many additional useful functions. The ultimate goal of designing this toolkit was to facilitate the study of MPEG video transmission over ATM-based networks. The toolkit consists of four major modules, which appear as four push-buttons in the main Motif menu: (1) encoding, (2) statistical analysis, (3) transmission simulation, and (4) decoding.

关键词： Television transmission

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On the Performance of video Super Resolution algorithms for HTTP-based Adaptive Streaming Applications 46

On the Performance of Video Super Resolution Algorithms for ...

引用

Applications of digital Image Processing XLVI 2023

作者： Barman, Nabajeet Reznik, Yuriy Martini, Maria Kingston University London United Kingdom Brightcove Inc. Seattle United States

ISBN: (纸本)9781510665620

Recent years have seen tremendous growth and advancement in the field of super-resolution algorithms for both images and videos. Such algorithms are mainly based on deep learning technologies and are primarily used for upsampling lower resolution images and videos, often outperforming existing traditional upsampling algorithms. Using such advanced upscaling algorithms on the client side can result in significant bandwidth and storage savings as the client can simply request lower-resolution images/videos and then upscale them to the required (higher) display resolution. However, the performance analysis of such proposed algorithms has been limited to a few datasets which are not representative of modern-era adaptive bitrate video streaming applications. Also, many times they only consider scaling artefacts, and hence their performance when considering typical compression artefacts is not known. In this paper, we evaluate the performance of such AI-based upscaling algorithms on different datasets considering a typical adaptive streaming system. Different content types, video compression standards and renditions are considered. Our results indicate that the performance of video upsampling algorithms measured objectively in terms of PSNR and SSIM is insignificant compared to traditional upsampling algorithms. However, more detailed analysis in terms of other advanced quality metrics as well as subjective tests are required for a comprehensive evaluation. © 2023 SPIE.

关键词： Deep learning

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Visual content highlighting via automatic extraction of embedded captions on MPEG compressed video

Visual content highlighting via automatic extraction of embe...

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digital video compression: algorithms and technologies 1996

作者： Yeo, Boon-Lock Liu, Bede IBM Thomas J. Watson Research Cent. Yorktown Hgts NY USA

ISBN: (纸本)0819420425

Embedded captions in TV programs such as news broadcasts, documentaries and coverage of sports events provide important information on the underlying events. In digital video libraries, such captions represent a highly condensed form of key information on the contents of the video. In this paper we propose a scheme to automatically detect the presence of captions embedded in video frames. The proposed method operates on reduced image sequences which are efficiently reconstructed from compressed MPEG video and thus does not require full frame decompression. The detection, extraction and analysis of embedded captions help to capture the highlights of visual contents in video documents for better organization of video, to present succinctly the important messages embedded in the images, and to facilitate browsing, searching and retrieval of relevant clips.

关键词： video signal 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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Subjective assessment of concatenated compression systems

Subjective assessment of concatenated compression systems

引用

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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video compression algorithms for HEVC and beyond

Video compression algorithms for HEVC and beyond

引用

作者： SEIXAS DIAS, ANDRE Queen Mary University of London Queen Mary University of London

学位级别：博士

Due to the increasing number of new services and devices that allow the creation, distribution and consumption of video content, the amount of video information being transmitted all over the world is constantly growing. video compression technology is essential to cope with the ever increasing volume of digital video data being distributed in today's networks, as more e cient video compression techniques allow support for higher volumes of video data under the same memory/bandwidth constraints. This is especially relevant with the introduction of new and more immersive video formats associated with signi cantly higher amounts of data. In this thesis, novel techniques for improving the e ciency of current and future video coding technologies are investigated. Several aspects that in uence the way conventional video coding methods work are considered. In particular, the properties and limitations of the Human Visual System are exploited to tune the performance of video encoders towards better subjective quality. Additionally, it is shown how the visibility of speci c types of visual artefacts can be prevented during the video encoding process, in order to avoid subjective quality degradations in the compressed content. Techniques for higher video compression e ciency are also explored, targeting to improve the compression capabilities of state-of-the-art video coding standards. Finally, the application of video coding technologies to practical use-cases is considered. Accurate estimation models are devised to control the encoding time and bit rate associated with compressed video signals, in order to meet speci c encoding time and transmission time restrictions.

关键词： Electronic Engineering video compression algorithms High Efficiency video Coding video coding solutions

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Units of video compression

Units of video compression

引用

Conference on Independent Component Analyses, Wavelets, and Neural Networks

作者： Hsu, MK Hsu, C Szu, H Lee, TN George Washington Univ Dept ECE Digital Media RF Lab SEAS GWU Washington DC 20052 USA

ISBN: (纸本)0819449628

video compression was widely adopted for bandwidth saving reasons in Internet and in digital TV. Although advanced compression methodologies were exceedingly desirable for much higher compression ratios and much better quality of a streaming video, the standard compression methods remained nevertheless at the level of JPEG2000 for single frames of images using DCT & wavelets, and WEG using DCT and exhaustive pixel correlations for the optical flow compression for the video. However, with the recent advent of sophisticated sensory technologies for NASA space missions, both the frame rate and the resolution of video streams become soon beyond the traditional capability of those DCT based compression methods. The goal was to find fundamental units of video that could be applied to the ultra-high frame rates of video streams. In this paper a novel implementation of video compression was based on the singularity maps in both space and time for the first time.

关键词： ultra-high frame rate wavelet compression units of video MPEG temporal singularity maps

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Reference frame representation in the transform domain for H.261 video compression

Reference frame representation in the transform domain for H...

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Conference on digital compression technologies and Systems for video Communications

作者： Kasperovich, L INST INFORMAT TECHNOL SINGAPORE 117685SINGAPORE

ISBN: (纸本)0819423564

To deal with the temporal redundancy of an input video sequence H.261 Standard specifics to use displaced frame differences with reference frames and, optionally, motion compensation technique. Usually, encoding process is performed in a loop comprising reconstruction of a reference frame in spatial domain along with the computation of a difference between a successive input video frame and its reference, followed by DCT compression of that displaced frame difference. In this paper we show that the reference frames can be reconstructed in the transform domain instead, having no impact on the computational accuracy and output bitstream. In this way, we represent all reference frames in the transform domain in a form of dequantized DCT coefficients, so the next inter-frame is a difference between the next DCT-transformed input picture and the current reference frame. This inter-frame is then quantized and entropy encoded on a regular basis. The output bitstream remains to be H.261-compliant, while the compression ratio as well as quality of the decompressed video are the same as in conventional implementation. We also present the performance results for the software codec running on Pentium PC.

关键词： video compression standards optimization of H.261 real-time 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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Using video quality metrics for something other than compression 41

Using video quality metrics for something other than compres...

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Conference on Applications of digital Image Processing XLI

作者： Kokaram, Anil Kelly, Damien Inguva, Sasi Lin, Jessie Wang, Yilin Chen, Chao Birkbeck, Neil Covell, Michele Adsumilli, Balu Benting, Steve Trinity Coll Dublin Sigmedia Grp Dept Elect Engn Dublin Ireland YouTube Google Media Algorithms Team Mountain View CA USA

ISBN: (数字)9781510620766

ISBN: (纸本)9781510620766

The development of video quality metrics and perceptual video quality metrics has been a well established pursuit for more than 25 years. The body of work has been seen to be most relevant for improving the performance of visual compression algorithms. However, modeling the human perception of video with an algorithm of some sort is notoriously complicated. As a result the perceptual coding of video remains challenging and no standards have incorporated perceptual video quality metrics within their specification. In this paper we present the use of video metrics at the system level of a video processing pipeline. We show that it is possible to combine the artefact detection and correction process by posing the problem as a classification exercise. We also present the use of video metrics as part of a classical testing pipeline for software infrastructure, but here it is sensitive to the perceived quality in picture degradation.

关键词： video Quality Metrics Visual Perception video Processing YouTube video compression video codecs Classification

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