The following is a brief description of my research intererets and projects. For publications related to these projects, see my publication list, where some papers can be downloaded.
Large amount of multimedia information is being created and stored. In order to make effective use of this information techniques for rapid audio, image and video retrieval are required. We are working on the following projects
Multimdia applications have special quality of service (QOS) requirements in terms of bandwidth, processing time, delay, delay jitter and error rate. In order to guarantee the QOS, these requirements must be specified to the operating system, transport system and multimedia server. We are looking into how to specify these requirements for different applications and at different levels so that QOS can be satisfied while system resources are used efficiently.
A typical example of media on demand system is the World Wide Web, through which we can retrieve multimedia information when needed. However, the current WWW has a number of limitations. First it does not support real time retrieval, transmission and presentation of continuous media (audio and video). Second, it does not support simultaneous retrieval, transmission and presentation of multiple related continuous media items. We are looking into issues of how to overcome these limitations.
Graceful quality degradation can be used to meet QOS of most multimedia applications. To achieve graceful quality degradation during system resource shortage, media data should be coded using scalable techniques. We are looking into scalable coding techniques suitable for graceful quality degradation.
We are also interested in semantic-preserving coding techniques suitable for image and video indexing and retrieval.
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