Multimedia Transmission and Retrieval Techniques of Thin Client/Server Computing
Date Issued
2005
Date
2005
Author(s)
Kuo, Chia-Chen
DOI
en-US
Abstract
Recent technology advances have brought revolutionary impacts to our life. The Internet emerges as a collaborative platform and it is envisioned to be even more important for years to come. In particular, real-time transmission of multimedia data over the Internet is attracting an increasing amount of attention. This dissertation explores the issues and the techniques of enabling multimedia applications for the thin client/server computing. A prototype of a video communication system based on H.323 family of ITU-T recommendations is developed to demonstrate the support of multimedia applications with a terminal server and thin clients such as Windows-based terminals. Our studies on the network applications over thin clients are composed of two parts: (1) the collaborative client/server conferencing system and (2) the universal transcoder architecture. With the proposed architecture, an application of multi-user video conferencing system is devised for illustrative purposes. The collaborative client/server conferencing system leverages the benefit of sharing common components within multiple conferencing terminals as well as increases their extensibility and ease of use. As validated by our experimental results, multimedia applications can be efficiently supported in an IP-based thin client/server computing environment. In addition, the universal transcoder technique is devised to shift jobs from thin clients to a supporting server, thus reducing the computing overhead required by the clients.
In addition, multimedia streams impose tight temporal constraints since different kinds of continuous multimedia streams have to be played synchronously. We devise in this dissertation an adaptive transmission scheme to ensure the stable and synchronous playback of audio and video streams based on the Real-time Transport Protocol. Realization of our adaptive transmission control is composed of a series of operations in three stages, namely, (1) dynamic reordering mechanism, (2) error-resilient mechanism, and (3) adaptive synchronization mechanism. As validated by our performance study, the adaptive transmission mechanism is able to strike a good balance of both stable playback and the end-to-end delay reduction.
Furthermore, in order to shorten the retrieval time of multimedia contents, we proposed algorithm DDS for nearest neighbor search in high dimensions. The Nearest Neighbor Search problem is defined as follows: given a set P of n points, answer queries for finding the closest point in P to the query point. This problem arises in a large variety of multimedia applications, particularly in the context of similarity search. Most existing techniques for solving this problem suffer from the "curse of dimensionality" that means the performance of system scales poorly with increased dimensionality of underlying data. In view of this, we propose an efficient dynamic dimension selection algorithm to improve the performance of the nearest neighbor search especially in high dimensions.
Subjects
精簡型主從式計算
網路多媒體
thin client/server computing
networked multimedia
Type
thesis
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