Wireless Sensor Network implementations move toward multimedia applications which necessitate more energy consumption every other day. Special sensor networks designed primarily for the delivery of multimedia content are called Wireless Multimedia Sensor Networks. In these networks, deployed nodes may change their places with or without user requirement which results in a non-uniform distribution. In this context, data fusion and processing in Wireless Multimedia Sensor Networks become crucial when considering application domains and readily available resources. Surveillance applications domain is among the popular implementation areas of Wireless Multimedia Sensor Networks. In this paper, an analysis on the state-of-the art data fusion and processing in Wireless Multimedia Sensor Networks targeting surveillance applications is presented and possible future work is stated.