We propose a new photo search method that uses three-dimensional (3D) viewpoints as queries. 3D viewpoint-based image retrieval is especially useful for searching collections of archaeological photographs,which contain many different images of the same object. Our method is designed to enable users to retrieve images that contain the same object but show a different view, and to browse groups of images taken from a similar viewpoint. We also propose using 3D scenes to query by example, which means that users do not have the problem of trying to formulate appropriate queries. This combination gives users an easy way of accessing not only photographs but also archived information.

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This paper presents performance comparison among five strategies for mobile support.The major facilities that are required for a network protocol to support mobile hosts are location management and packet forwarding.Based on this observation, we consider five basic strategies which use distinct methods to achieve these facilities and compare their performance.These five strategies are Broadcast Kotification (BN), Broadcast Forwarding (BF), Broadcast Query (BQ), Default Forwarding (DF), and Default Query (DQ).As a result of analytical evaluation and comparison, it is shown that under different network conditions, such as number of routers, network topology, migration/communication ratio, data/control packet size ratio, different strategies produce minimum network traffic.In short, DF and DQ show the best performance in scalability, while BF and BQ are efficient for frequent migration.On the other hand, BN is suitable for a small network which has hosts with rare migration.