Design And Implementation Of High Frame Rate Digital Image Acquisition And Display System Based On System On A Chip

With the development of semiconductor technology, the video-image acquisition and processing technolongy is getting more mature, and has been widely used on visual inspection, automatic flaw detection, measurement and detection, automatic identification, etc. According to the running in the350KM/H high speed train, this paper establishes state monitoring of high frame rate, high resolution image acquisition and processing system in real time. In order to meet the stable and clear image which obtained from350KM/H high speed trains, project uses the300fps high-speed industrial camera. At the same time, in order to meet the requirements of the project has the advantages of small volume, low cost, re-develop and real-time, use the system on chip (SoC) processing large amounts of video image data generates by high speed industrial camera.This paper focused on three aspects in on-chip real-time image acquisition system: image acquisition, storage and display.Firstly, according to the request of the project to calculate the camera and camera interface parameters, and use300fps,640*480CMOS high speed industrial camera with Camera Link camera interface. CMOS high speed industrial camera have the features of high frame rate, high image steady, high transmission capacity and high anti-interference ability, which makes it compared with traditional civil camera (vidicon) has more advantages when being applied in the high speed train image acquisition and processing system. In terms of Camera interface, with excellent anti-interference ability and the transmission bandwidth, Camera Link camera interface using multiple pairs of differential signal transmitted in parallel. Project selection components model based on study the principle of Camera Link, and draw the corresponding schematic and PCB, and debugging camera interface function, to meet the requirements of the project collected HD picture data.Secondly, system on chip (SOC) is used in the project to realize process of data in real-time. A large number of data needs to be processed in high-speed and high-definition image acquisition and display system which should be small size and real-time. Field programmable gate array (FPGA) processing platform is selected in the project whose core device is virtex-5-LX110T. FPGA platform is competent for image acquisition and processing because of its feature of high sampling rate and parallel processing, especially Xilinx embedded high performance multiply-add module array (DSP core) in the virtex series device. In terms of data acquisition, project take DDR2SDRAM to realize high-speed access of large numbers of data, and image data is accessed under the control of controller generated by Xilinx MIG core. Finally, real-time display of SOC is realized based on data acquisition and access. We choose the means of DVI to display, which have the features of little distortion, fast transmission, more clear and smooth, much higher refresh rate. Based on the study of DVI display principle, and design I2C main module to configured internal registers of DVI driving device CH7301C use Verilog language, achieve the real time image display.