C. Processing unit
Micro-controller is enough for simple encoding and processing of image. The power consumption of microcontroller is much less as compare to FPGA. Similarly, Micro-controller is much cheaper than FPGA. If we take consume power with extra budget the complexity of FPGA leads to a development of high resolution and less space consumption visual surveillance network. Development environment may not be a cost effective solution but in the recent advancement FPGA is the best solution for reconfigurable Wireless Image Sensor since it is capable of on board image processing and huge block RAM is the added advantage for computational cost.