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Multimedia Sensor Networks (MSNs), which allow capturing acoustic and visual information, provide an unprecedented opportunity for variety of applications. This paper investigates the heterogeneous coverage problem in MSNs, i.e., how many multimedia sensors should be deployed to guarantee that each point in the monitored region is covered by multiple types of sensors. It is different from the coverage problem in conventional homogeneous sensor networks, mainly because that it is based on a heterogeneous sensing model, which is a hybrid of the omni-sensing model and the directional-sensing model.
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