Wireless Video System Based On SOPC

With the development of wireless communication technology, embedded technology, sensor technology and semiconductor technology, design of a low-cost, minisize and reconfigurable wireless video acquisition and transmission system is possible. The focus of this paper is to design a minisize wireless video acquisition and transmission system used for information exchange in medical emergency. It captures and compresses pictures, and then sends them through wireless communication network.Firstly, the design and implementation of customized image capture IP core based on Avalon bus was presented in this paper. We hierarchically spited the design into blocks called design partitions and integrated device driver into the HAL API. The customized peripheral was added into Nios II system and the test is smooth and effective. The IP core was configurable and can be easily ported into other embedded image capture system.In the JPEG image compression hardware accelerate circuit design part, a JPEG image compression hardware accelerate circuit is designed with Verilog HDL on an FPGA (Field Programmable Gate Array).Simulations prove that the circuit meets the design requirements.In the Avalon Bus interface design part, an Avalon Bus interface and drives for the JPEG image compression hardware accelerate circuit are designed. As a result, the JPEG image compression hardware accelerate circuit can be used as an IP core (Intellectual Property core) in the whole system. Tests prove that the design is correct and the JPEG image compression hardware accelerate circuit can be integrated in the SOPC (System on Programmable Chip) system successfully as an IP core.In the code stream wireless transmission part, some wireless communication standard protocols are introduced. And by reference to these standard protocols, a non-standard wireless communication protocol is implemented by using the nRF24L01 wireless RF chip. Tests prove that the module can transmit data correctly.In the experiment part, an experiment is implemented to test the function of the designed JPEG image compression IP core and the wireless communication module.A image is compressed and sent to the receiver wirlessly by the wireless communication module.The received data are stored. With the corresponding JPEG head file, the encoded image can be decoded and displayed.The end of this paper summarizes the points of writer's research work and predicts the future direction of minisize wireless image capturing and transmission system for medical emergency.