MULTIMEDIA '99最新文献_第9页

A forward error recovery technique for MPEG-II video transport 面向MPEG-II视频传输的前向错误恢复技术

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319897

R. Pillai, B. Prabhakaran, Qui Qiang

{"title":"A forward error recovery technique for MPEG-II video transport","authors":"R. Pillai, B. Prabhakaran, Qui Qiang","doi":"10.1145/319878.319897","DOIUrl":"https://doi.org/10.1145/319878.319897","url":null,"abstract":"Digital video is increasingly being used as an important medium of information. MPEG-II is widely used for compression of digital video in order to reduce the network bandwidth and storage requirements [4]. Digital video, when used in networked multimedia applications, suffers from data losses/errors. This is a serious problem in the case of wireless networks [7]. There are several ways to recover from these losses or errors. Recovery mechanisms based on re-transmission of the data may not be suitable in many cases because of the real-time nature of the applications and the absence of reverse channel for feedback. Real-time communication of digital video, as in the case of video conferencing, benefit from forward error correction/recovery techniques. Forward error correction (FEC) codes and frequent synchronizing codewords have been proposed in [5, 61. These techniques require low complexity hardware, however they add redundancy thereby lowering the coding efficiency. FEC can potentially add more errors to a bit stream once the correcting capability of the code has been exceeded. An error-resilient entropy coding (EREC) technique has been suggested in [2, 3, 11. EREC achieves bit stream resynchronization. [2, 3, l] also propose a hierarchical pyramid predictor in place of the standard differentially coded DPCM. These proposals consider channels subject to burst errors and packet errors and aim at providing an environment where performance degrades gracefully with increasing channel noise. Several simple error resilient approaches are suggested in [7]. These approaches include error concealment, temporal localization by sending extra I-frames, and spatial localization by providing early resynchronization of the elements in the bit stream that are coded differentially between MPEG-II macro-blocks.","PeriodicalId":265329,"journal":{"name":"MULTIMEDIA '99","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129855022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Webtour: a system to record and playback dynamic multimedia annotations on web document content Webtour:在web文档内容上记录和播放动态多媒体注释的系统

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319925

C. Sastry, Darrin P. Lewis, A. Pizano

引用次数: 14

Concept for content administration of database powered multimedia web-sites 基于数据库的多媒体网站内容管理的概念

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319893

Klaus Niederacher, Alexander Wahler

引用次数: 1

Associating video with related documents 关联视频和相关文档

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319883

R. Hamada, I. Ide, S. Sakai, Hidehiko Tanaka

{"title":"Associating video with related documents","authors":"R. Hamada, I. Ide, S. Sakai, Hidehiko Tanaka","doi":"10.1145/319878.319883","DOIUrl":"https://doi.org/10.1145/319878.319883","url":null,"abstract":"Reflecting the increasing importance of handling multimedia data, many studies are made on indexing to TV broadcast video. Multimedia data consist of image, audio, and text, and various research on analysis of each individual medium has been made. Especially, image processing has been the main issue when handling multimedia for a long time. But recently, it has started to be considered that image processing alone is insufficient for thorough understanding of multimedia data. In the 1990’s, integrated processing that supplements the incompleteness of information from each medium has become a trend. Following this trend, we are trying to integrate TV programs with related documents, taking advantage of the relative easiness of extracting semantic structures from text media. Among various programs, cultural programs are considered as appropriate sources since (1)supplementary documents are available and (2)the video contains a lot of implicit information that integration could be helpful to thorough understanding of supplementary texts. Many attempts have been made to index video by means of multimedia integration. But sufficient accuracy for practical use is not necessarily achieved since their subjects are too general to achieve accuracy from elemental technoiogies by making use of domain specific characteristics. In our method, we examine and construct a practical system using relatively simple elemental technologies by reflecting the result of one medium’s process to another. We will focus on cooking programs, so that we can take advantage of domain specific constraints and knowledge. Through the examination in this specific domain, and the usage of a supplementary document and its analysis, we aim for proposing a novel advanced multimedia integration method. Using the result of this method, we also propose an integrative restructuring method of the multimedia data provided both from the video and the supplementary document.","PeriodicalId":265329,"journal":{"name":"MULTIMEDIA '99","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117296336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

VCS: a virtual environment support for awareness and collaboration VCS:支持感知和协作的虚拟环境

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319922

Maojun Zhang, Linda Wu, Lifeng Sun, Yunhao Li, Bing Yang

引用次数: 4

A dual watermarking technique for images 图像的双重水印技术

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319891

S. Mohanty, K. Ramakrishnan, M. Kankanhalli

引用次数: 126

an actor/actress annotation system for drama videos 戏剧视频的演员/演员注释系统

MULTIMEDIA '99 Pub Date : 1999-10-01 DOI: 10.1145/319878.319939

S. Satoh