Delivering real-time surveillance services to handheld devices over the Internet is an interesting application in the mobile environment. Developing such system needs tackle considerable design challenges including device downsides, platform heterogeneity and bandwidth limitation. In this paper, we present a Java-based approach for developing a mobile surveillance system which supports PDA users to overcome the challenges. This approach applies the emerging Java technologies including J2ME, RMI, and JMF for mobile computing, handheld devices, distributed computing, and multimedia computing. To achieve the thin-client goal in the post-PC era, a textual-based application-level communication protocol is also designed. We demonstrate the effectiveness of our design approach via actual experimentations on Palm PDA. With the advent of J2ME standardization, our system is expected to be generically applicable to various handheld and mobile devices.
We propose an XML-based framework for speech access to multiple image databases without the need for keyboard or pen-based input. The key idea is to orally command the system in drawing an abstract sketch of the target images using simple graphical objects. We define an oral language for image description and query control named SpeechQuel. The abstract sketch is represented in W3C SVG format while all other query constraints are represented using a device and system independent XML language called SpeechQuelX. This facilitates content-based access to multiple and/or heterogeneous image databases with a single query. Preliminary implementation result successfully demonstrates the feasibility and efficiency of our approach.
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