Mohamed Mostafa A. Azim & Xiaohong Jiang 
Wireless Sensor Multimedia Networks [PDF ebook] 
Architectures, Protocols, and Applications

Wireless sensor networks (WSNs) are a special class of ad hoc network in which network nodes composed of tiny sensors pass data such as temperature, pressure, and humidity through the network to a central location. Wireless sensor multimedia networks (WSMNs) are a special category of WSNs in which the sensor nodes are small cameras and microphones