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MULTIMEDIA '01最新文献

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Mitigating impact of starting new session in zoned disk 减轻在分区磁盘中启动新会话的影响
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500239
Y. Won, K. Cho, Seung-Min Park
{"title":"Mitigating impact of starting new session in zoned disk","authors":"Y. Won, K. Cho, Seung-Min Park","doi":"10.1145/500141.500239","DOIUrl":"https://doi.org/10.1145/500141.500239","url":null,"abstract":"Cycle based disk scheduling approach is widely used to satisfy the timing constraints of the multimedia data retrieval. When new service request arrives at the server, the length of cycle needs to be extended to accommodate the new service session. Under legacy cycle based disk scheduling paradigm, the amount of blocks fetched for a session in each cycle becomes insufficient when the cycle is extended to accommodate a new stream and subsequently some of the ongoing sessions suffer from jitter. In this article, we present a technique called \"prebuffering\" which makes the streaming server resilient to the cycle extension. Our model is based upon the zone based disk.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132113363","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: 2
On error preserving encryption algorithms for wireless video transmission 无线视频传输中的保错加密算法研究
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500187
A. Tosun, W. Feng
{"title":"On error preserving encryption algorithms for wireless video transmission","authors":"A. Tosun, W. Feng","doi":"10.1145/500141.500187","DOIUrl":"https://doi.org/10.1145/500141.500187","url":null,"abstract":"In this paper, we describe error preserving encryption mechanisms for transmission of vido over wireless networks. One of the main problems with the secure transmission of data over wireless networks is that the bit errors that occur need to typically be sesolved before decryption can begin. For vido straming applications, this is unacceptable due to the general requirement that video be presented to the user in a continuous manner with low latency. In this paper, we describe a systematic approach to understanding error preserving encryption algorithms. That is, encryption algorithms designed specifically for video to solve this problem. The main objective of this work is to ensure that the basic encryption of the stream can survive bit errors and that the errors are then passed to the application. We make use of the fact that video compression typically results in random byte distribution. Error preserving encryption algorithms are secure against ciphertext only attacks but vulnerable against known plaintext attacks. We limit this vulnerabillity by requiring a key exchange for each session.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"51 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132192909","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: 33
Software systems for virtual university operations 虚拟大学运作的软件系统
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500250
T. Shih
{"title":"Software systems for virtual university operations","authors":"T. Shih","doi":"10.1145/500141.500250","DOIUrl":"https://doi.org/10.1145/500141.500250","url":null,"abstract":"Distance Learning system is one of the most important applications of multimedia and communication technologies. In the past few years, Tamkang University has a special interesting group of research faculties from computer engineering, education, and literature departments. We follow the operation procedures of a virtual university, and developed Distance Learning system is one of the most important applications of multimedia and communication technologies. In a set of tools to be used by students, course designers, and instructors.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132346110","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: 7
Design of a virtual auditorium 虚拟礼堂的设计
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500147
Milton Chen
{"title":"Design of a virtual auditorium","authors":"Milton Chen","doi":"10.1145/500141.500147","DOIUrl":"https://doi.org/10.1145/500141.500147","url":null,"abstract":"We built a videoconference system called the Virtual Auditorium to support dialog-based distance learning. The instructor can see dozens of students on a tiled wall-sized display and establish eye contact with any student. Telephone-quality audio and television-quality video can be streamed using commodity codecs such as wavelet and MPEG-4. Support for stream migration allows a seamless user interface to span the multiple computers driving the display wall..We performed user studies on the auditorium parameters. We found that the optimal display wall size must balance two contradictory requirements: subjects prefer larger videos for seeing facial expressions and smaller videos for seeing everyone without head movement. Ideally, each video should have a field of view that spans 14 degrees, which corresponds to a slightly larger than life-size image. At the very least, each video should have a field of view of 6 degrees. We found that a video window should be less than 2.7 degrees horizontally and 9 degrees vertically from the camera in order to maintain the appearance of eye contact for the remote viewer. In addition, we describe a previously unreported gaze phenomenon: a person's expectation determines his perception of eye contact under ambiguous conditions.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115645662","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: 75
Optimal delivery of multi-media content over networks 多媒体内容在网络上的最佳交付
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500155
Arthur Allen
{"title":"Optimal delivery of multi-media content over networks","authors":"Arthur Allen","doi":"10.1145/500141.500155","DOIUrl":"https://doi.org/10.1145/500141.500155","url":null,"abstract":"In this paper, we describe scalable optimal methods for delivering archived and live multi-media content from servers to multi-media client players endowed with substantial RAM or disk-based buffers. These methods result from the application of linearoptimization theory (linear programming) to the problem of how best to modulate the flow rate of constant-bit-rate (CBR) content for all sessions linking a server to its clients, in which session flow rates are subject to upper and lower bound constraints, and aggregate flow cannot exceed a specified maximum. An efficient O(n) algorithm to maximize aggregate flow is described. We propose a tunable minimum constraint on session flows that is shown to result in a rapid and sustained accumulation of reserve content within a player's buffer. An associated Call Admission Control (CAC) algorithm is also described. The benefits of the methods described include improved server efficiency, enhanced end-user experience (QOS), cost effective end to-end content delivery, directly from origin servers to clients without need of intervening edge-caching technology.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116329564","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: 6
Automated basis-view and match-point selection for the ArchVision RPC image-based model 为ArchVision RPC基于图像的模型自动选择基准视图和匹配点
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500246
Charles Carpenter, W. Seales, C. Jaynes, Randall Stevens
{"title":"Automated basis-view and match-point selection for the ArchVision RPC image-based model","authors":"Charles Carpenter, W. Seales, C. Jaynes, Randall Stevens","doi":"10.1145/500141.500246","DOIUrl":"https://doi.org/10.1145/500141.500246","url":null,"abstract":"The Rich Photo-Realistic Content (RPC) image-based model defined and used by ArchVision represents a photo-realistic scene as an ordered set of images. A desired view from the represented viewing directions can quickly be extracted for rendering and display. The benefit of the RPC is its photo-realistic quality. One weakness, however, is that there is no support for view interpolation between closely related basis views. This paper presents results from a tool for creating a new RPC-like image-based model, which detects and discards captured views that are determined to be faithfully and automatically interpolated from the remaining images in the RPC. We exploit the geometric constraints of the acquisition system and provide an automated matching algorithm, and interpolation scheme, and an error metric displayed in a graphical tool for monitoring the quality impact of discarding particular frames.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116534378","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: 3
Supporting QoS for ubiquitous multimedia service delivery 支持QoS，实现无处不在的多媒体服务交付
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500211
Yi Cui, K. Nahrstedt
{"title":"Supporting QoS for ubiquitous multimedia service delivery","authors":"Yi Cui, K. Nahrstedt","doi":"10.1145/500141.500211","DOIUrl":"https://doi.org/10.1145/500141.500211","url":null,"abstract":"","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125501058","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: 9
Preemptive bandwidth allocation protocol for multicast, multi-streams environments 抢占式带宽分配协议，用于组播，多流环境
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500232
Nawel Chefaï, N. Georganas, G. Bochmann
{"title":"Preemptive bandwidth allocation protocol for multicast, multi-streams environments","authors":"Nawel Chefaï, N. Georganas, G. Bochmann","doi":"10.1145/500141.500232","DOIUrl":"https://doi.org/10.1145/500141.500232","url":null,"abstract":"In this paper, we present a protocol that allocates resources in communication networks in order to assure specific QoS characteristics as requested by new connections. The design takes into consideration the possibility for the network allocation to adapt to application requirements.The proposed protocol uses a Bandwidth Preemptive Algorithm that permits adaptive bandwidth allocation in multicast, multi-stream environments. This design has been inspired by the one proposed by Sakate [1] where a centralized methodology is used. In our approach, we use a distributed methodology where we change the behavior of the communication service and allow the continuation of the service under more severe conditions. In other words, when there is a lack of bandwidth for a new connection, the communication service will try to find the missing bandwidth within the existent connections (or streams) when looking for a feasible path on a hop-by-hop basis, starting from the destination to an a on-tree node.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124564843","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: 5
Learning video browsing behavior and its application in the generation of video previews 学习视频浏览行为及其在视频预览生成中的应用
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500161
T. Syeda-Mahmood, D. Ponceleón
{"title":"Learning video browsing behavior and its application in the generation of video previews","authors":"T. Syeda-Mahmood, D. Ponceleón","doi":"10.1145/500141.500161","DOIUrl":"https://doi.org/10.1145/500141.500161","url":null,"abstract":"With more and more streaming media servers becoming commonplace, streaming video has now become a popular medium of instruction, advertisement, and entertainment. With such prevalence comes a new challenge to the servers: Can they track browsing behavior of users to determine what interest users? Learning this information is potentially valuable not only for improved customer tracking and context-sensitive e-commerce, but also in the generation of fast previews of videos for easy pre-downloads. In this paper, we present a formal learning mechanism to track video browsing behavior of users. This information is then used to generate fast video previews. Specifically, we model the states a user transitions while browsing through videos to be the hidden states of a Hidden Markov Model. We estimate the parameters of the HMM using maximum likelihood estimation for each sample observation sequence of user interaction with videos. Video previews are then formed from interesting segments of the video automatically inferred from an analysis of the browsing states of viewers. Audio coherence in the previews is maintained by selecting clips spanning complete clauses containing topically significant spoken phrases. The utility of learning video browsing behavior is demonstrated through user studies and experiments.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131423596","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: 97
A flexible image retrieval and multimedia presentation management system for multimedia databases 一个灵活的多媒体数据库图像检索和多媒体展示管理系统
MULTIMEDIA '01 Pub Date : 2001-10-01 DOI: 10.1145/500141.500255
Shu‐Ching Chen, M. Shyu, Xia Jin, Qiong Chen, Chengcui Zhang, J. Strickrott
{"title":"A flexible image retrieval and multimedia presentation management system for multimedia databases","authors":"Shu‐Ching Chen, M. Shyu, Xia Jin, Qiong Chen, Chengcui Zhang, J. Strickrott","doi":"10.1145/500141.500255","DOIUrl":"https://doi.org/10.1145/500141.500255","url":null,"abstract":"In today's fast-growing information age, multimedia data is becoming more and more common in daily applications, however this data is nearly useless if there is no computer-aided browsing, searching, and retrieving mechanism to obtain the desired contents. In this demonstration, we present a multimedia query and presentation management system for multimedia databases. It uses an unsupervised segmentation method for image and video feature extraction. A presentation design interface systems is provided that allows query results to be used to create multimedia presentations.","PeriodicalId":416848,"journal":{"name":"MULTIMEDIA '01","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131949907","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: 6
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