The field of view of one camera is limited. To monitor a large area, we often need to use multiple cameras together or a
camera network. In general, the networks with more cameras can monitor larger area. However, using more cameras
often means higher cost. In this paper, we study how to improving the coverage of a camera network by only adjusting
the orientations of the cameras, where adding the cameras is not necessary. A particle swarm optimization algorithm was
developed to solve this problem. On an experiment the algorithm improved the coverage about 14%. The result is also
better than the existing approach.
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