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We present <i>PiCam</i> (Pelican Imaging Camera-Array), an ultra-thin high performance monolithic camera array, that captures light fields and synthesizes high resolution images along with a range image (scene depth) through integrated parallax detection and superresolution. The camera is passive, supporting both stills and video, low light capable, and(More)
We derive an empirical model for spatial registration patterns of mobile users as they move within a campus wireless local area network (WLAN) environment and register at different access points. Such a model can be very useful in a variety of simulation studies of the performance of mobile wireless systems, such as that of resource management and mobility(More)
The increased availability and usage of multimedia information have created a critical need for efficient multimedia processing algorithms. These algorithms must offer capabilities related to browsing, indexing, and retrieval of relevant data. A crucial step in multimedia processing is that of reliable video segmentation into visually coherent video shots(More)
We present an empirical registration model derived from the WLAN registration patterns of the mobile users. There exist models that accurately describe individually the spatial and temporal aspects of user registration, and demonstrate the importance of this modeling. The main distinction of the new model from the previous empirical models is that we are(More)
Multimedia data is generally stored in compressed form in order to e ciently utilize the available storage facilities. Access to multimedia archives is thus dependent on our ability to browse compressed information. In this paper, a novel approach to multiple object tracking from compressed multimedia databases is presented. This approach is intended to(More)
The evaluation of a great deal of research on ad hoc networks, as well as cellular networks, depends on models of user mobility. Many models have been developed and utilized, such as the random walk and random waypoint models. These are simple to implement and analyze but unlikely to be realistic. We develop a model based on extensive experimental data from(More)
P Pack, S. Pailer, R. Pal, S. Panken, F. Papadias, D. Papadimitratos, P. Papadimitriou, G. I. Papadopoulos, C. Papantoni, T. Parashar, M. Passarella, A. Passas, N. Pelsser, C. Pelusi, L. Peyravian, M. Pitsillides, A. Pokorn, J. Politis, C. Pong, D. Prasad, N. R. As a token of my deep appreciation for their professionalism and dedication to the ideals of our(More)