An Infrared Image Acquisition And Display System Based On FPGA

With the rapid development of microelectronical technology, the real-time image processing techniques are more and more widely applied in the field of aviation, communications, medical and industrial control. FPGA(Field Programmable Gate Array) is one of the most extensively applied programmable logic devices. With rapid speed, flexible configuration and easy, low cost, suitable for image acquisition system of the central control unit and the display, FPGA is suitable for image acquisition and display core of the system control unit. This paper, taking high-performance linear CCD image sensor as the image input and using Xilinx spartan6series FPGA chip as the core control devices, designs the FPGA-based infrared array image acquisition and display system. The selected core FPGA device is XC6SLX16of the Xilinx spartan6series. The system mainly consists of three parts:image acquisition module, image storage module and image display interface module. The main tasks are as follows:Firstly, we analyze the driving requirements of the line image sensors G9494-256D as well as dedicated CCD analog signal processor AD9822. Under the ISE development environment, we use Verilog HDL to realize G9494-256D and AD9822’s driver.Secondly, after careful study of the working principle of the second-generation memory technology of DDR2SDRAM and reading-and-writing timing requirements, MICRON MT47H16M16BG-364MB DDR2SDRAM of MICRON company is chosen as the memory unit of image data.We realize the read and write control using DDR2SDRAM controller generated by Xilinx ISE MIG IP core generator and has passed verification by ISE ChipScope and functional simulation of Modelsim.At last, we select CameraLink, whose connector is multiple pairs of differential signal LVDS parallel transmission. As the image display interface, It has excellent anti-jamming capability and transmission bandwidth. In-depth study of CameraLink principle, the TI’s LVDS converter chip is selected so as to realize the connecting of camera data portion, clock parts, serial communication and camera control part of the CameraLink.