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

共 374 条记录，以下是81-90 订阅

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ISO IEC SOFTWARE IMPLEMENTATION OF MPEG-1 video

ISO IEC SOFTWARE IMPLEMENTATION OF MPEG-1 VIDEO

引用

conference on digital video compression on Personal Computers: algorithms and technologies

作者： FOGG, C AU, P ECKART, S HANAMURA, T OOSA, K QUANDT, B WATANABE, H UNIV WASHINGTON SEATTLEWA 98195

ISBN: (纸本)0819414824

The MPEG-1 video standard, ISO/IEC 11172 Part 2, specifies the syntax and the semantic rules by which bitstreams are generated in the encoder, and arithmetic rules by which pictures are reconstructed in the decoder. The actual encoder model is left open to the designer to choose among different cost and quality tradeoffs. An example encoder strategy is described in the informative annex D. A technical report giving a full encoder and decoder implementation expressed in the ANSI C programming language will become the fifth part of the ISO/IEC 11172 document. The encoder is based on a test model shaped by participants of the MPEG committee that produces good picture quality while exercising the full video syntax. The decoder employs full arithmetic accuracy at all stages, and include bitstream conformance checks. Finally, a companion systems codec demonstrates the temporal link between the systems and the video layers. To better serve as a learning tool for novices, the code is optimized for clarity rather than execution speed. In addition to an overview of the program, this paper provides a brief description of the encoder model.

关键词： Computer programming video Quantization Motion estimation Motion models Semantic video Image processing Systems modeling Compact discs Standards development

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USING 4X4 DCTS AND MOVING 4X4 BLOCKS FOR SOFTWARE ONLY video DEcompression

USING 4X4 DCTS AND MOVING 4X4 BLOCKS FOR SOFTWARE ONLY VIDEO...

引用

conference on digital video compression on Personal Computers: algorithms and technologies

作者： WILSON, R ACORN COMP LTD CAMBRIDGE CB4 4AEENGLAND

ISBN: (纸本)0819414824

4 X 4 inverse DCTs are computationally twice as efficient as 8 X 8 inverse DCTs. In addition they have less register pressure, making the implementation more efficient for most processors. This extra computational efficiency places more pressure on improving the other components of the video decompression system. This paper describes a coding scheme for the quantized components which has an efficient decompression algorithm. The implementation of the inverse DCT is examined in detail, including removing all multiplication operations and replacing them with single CPU cycle shift-and-add operations. The data flow through a complete 4 X 4 DCT is described such that the results of intermediate 1 X 4 DCTs are written to and read from memory as efficiently as possible. A set of quantizers for the 4 X 4 DCT are presented which allow the decompression process to use shift-and-add instead of multiply. Efficient DCTs by themselves are not enough: the paper discusses the effects of changing the search area (in particular to being non-square) and shows a coding scheme suitable for fast decompression. It also discusses how to organize the block matching and that good results can be obtained if some pixels are allowed to match worse than the nominal value.

关键词： Quantization video Computer programming Data conversion Data storage Image stacking Computing systems Compact discs video compression Eye

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digital video compression: algorithms and technologies 1995

Digital Video Compression: Algorithms and Technologies 1995

引用

digital video compression: algorithms and technologies 1995

The proceedings contain 49 papers. The topics discussed include: scene change detection and content-based sampling of video sequences;scene change detection in a MPEG compressed video sequence;scene decomposition of MPEG compressed video;temporal segmentation of videos: a new approach;single-frame prediction for high video compression;variable block size video coding with motion prediction and motion segmentation;and ordered kohonen vector quantization for very low rate interframe video coding.

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Multiview video coding using a multi-state dynamic programming disparity estimation algorithm

Multiview video coding using a multi-state dynamic programmi...

引用

conference on digital compression technologies and Systems for video Communications

作者： Grammalidis, N Strintzis, MG UNIV THESSALONIKI DEPT ELECT & COMP ENGNTHESSALONIKI 54006GREECE

ISBN: (纸本)0819423564

An efficient disparity estimation and occlusion detection and characterization algorithm for multiocular systems is presented. A dynamic programming algorithm, using a multiview matching cost as well as pure gometrical constraints, is used to provide an estimate of the disparity field and to identify occluded areas. An important advantage of this approach is that not only are the occluded points simultaneously detected, but they are also characterized by the number of views where each point is occluded. Specifically, a 'state' map describing the number of matches for each imaged pixel and thus identifying occluded points in the multiview sequence is produced. The disparity and state information is then coded using a directional coding technique and applied to obtain virtual images from intermediate viewpoints. Experimental results, obtained using a four-view image sequence, illustrate the performance of the proposed technique.

关键词： Computer programming Detection and tracking algorithms video coding Imaging systems Panoramic photography Cameras Computer engineering Computing systems Image display Stereoscopy

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Performance comparison of objective metrics on free-viewpoint videos with different depth coding algorithms 41

Performance comparison of objective metrics on free-viewpoin...

引用

conference on Applications of digital Image Processing XLI

作者： Tian, Shishun Zhang, Lu Morin, Luce Deforges, Olivier Natl Inst Appl Sci IETR UMR CNRS 6164 Rennes France

ISBN: (数字)9781510620766

ISBN: (纸本)9781510620766

The popularity of 3D applications has brought out new challenges in the creation, compression and transmission of 3D content due to the large size of 3D data and the limitation of transmission. Several compression standards, such as, Multiview-HEVC and 3D-HEVC have been proposed to compress the 3D content aiding by view synthesis technologies, among which the most commonly used algorithm is Depth-Image-Based-Rendering (DIBR), but the quality assessment of DIBR-synthesized view is very challenging owing to its new types of distortions induced by inaccurate depth map which the conventional 2D quality metrics may fail to assess. In this paper, we test the performance of existing objective metrics on free-viewpoint video with different depth coding algorithms. Results show that all the existing objective metrics perform not well on this database including the full-reference and the no-reference. There is certainly room for further improvement for the algorithms.

关键词： free-viewpoint video DIBR distortion depth coding quality assessment

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Temporal filtering of coded video

Temporal filtering of coded video

引用

conference on digital compression technologies and Systems for video Communications

作者： Richardson, IEG Turnbull, AG Riley, MJ ROBERT GORDON UNIV SCH ELECT & ELECT ENGNABERDEEN AB10 1FRSCOTLAND

ISBN: (纸本)0819423564

We describe a novel approach to filtering coded video data. MPEG video is filtered to reduce frame rate and bandwidth by dropping coded B-pictures. The choice of B-pictures to be dropped is made based on an 'activity measure' which indicates the amount of motion within the video scene. We present preliminary results which indicate that this method produces a filtered sequence with higher visual quality than a sequence produced by dropping B-pictures at regular intervals.

关键词： video Computer programming Visualization video coding Scalable video coding video compression Motion measurement Spatial resolution video processing Motion estimation

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Toward perceptual metrics for video watermark evaluation

Toward perceptual metrics for video watermark evaluation

引用

conference on Applications of digital Image Processing XXVI

作者： Winkler, S Gelasca, ED Ebrahimi, T Swiss Fed Inst Technol EPFL Audiovisual Commun Lab CH-1015 Lausanne Switzerland

ISBN: (纸本)0819450766

Assessing and comparing the performance of watermarking algorithms is difficult. The visibility of the watermark is an important aspect in this process. In this paper, we propose two metrics for evaluating the visual impact of video watermarks. Based on several different watermarking algorithms and video sequences, we identify the most prominent impairments as spatial noise and temporal flicker. We design the corresponding measurement algorithms and corroborate their performance through subjective experiments.

关键词： digital watermarking video Visibility video compression Algorithm development Visualization Discrete wavelet transforms Semantic video Spatial frequencies Visual system

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Model-based hierarchical motion compensation technique

Model-based hierarchical motion compensation technique

引用

conference on digital compression technologies and Systems for video Communications

作者： Lee, JS Lee, SU SEOUL NATL UNIV SCH ELECT ENGNSIGNAL PROC LABKWANAK GUSEOUL 151742SOUTH KOREA

ISBN: (纸本)0819423564

In this paper, a new motion compensation technique is proposed to enhance the performance of the conventional motion compensation technique using the block matching algorithm, whose main features are a translational motion model and a uniformly spaced motion field. The proposed MC technique consists of two main stages: split and merge. In split stage, deformable squared-block-based motion estimation technique is employed to describe a complex motion. In merge stage, the rate-distortion optimal quadtree decomposition technique is employed to adapt the nonuniform characteristics of motion in sequence. From the simulation result, it is shown that the proposed technique yields about 1 - 2 dB PSNR gain over BMA at the same bit rate.

关键词： Motion estimation Motion models Model-based design Ferroelectric materials Distortion Image compression Image resolution Genetic algorithms Signal processing Zoom lenses

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digital video and HDTV : algorithms and interfaces /

引用

2003年

作者： Poynton Charles A.

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Image quality prediction for bitrate allocation

Image quality prediction for bitrate allocation

引用

conference on digital compression technologies and Systems for video Communications

作者： Fleury, P Ebrahimi, T ETH ZURICH SIGNAL PROC LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819423564

Recent developments in image coding tend to promote schemes consisting of a great variety of coding algorithms applied to different parts of the image to code. This results in an improved rate-distortion behavior of the global system. The selection of the optimal coding method for a given region of an image is still a computationally intensive task, as most of the current schemes need to compute the result for all algorithms and to choose the most suited one. This paper investigates a method to predict the coding performance. This prediction is based on extracted features of the input image. The computation of those features, as well as the prediction itself, is computationally much less expensive than the exhaustive selection. The prediction system is based on neural networks. Selected image features and a set of representation of those features build the input of the network. The low computation cost also enables a dynamic distribution of the fixed bitrate over the different parts of the image, and therefore an algorithm capable to allocate bits to reach a constant quality over the whole image.

关键词： Image compression Image quality Binary data Neural networks Quantization Algorithm development Data modeling Computing systems Feature extraction Image processing

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