High-speed Dynamic Image Recognition And Acquisition Card Circuit Design

High-speed photography is an effective means to analyze and observe dynamic transient processes.In order to solve the problems of high data throughput and strict real-time requirements in the process of high-speed camera image acquisition,a high-speed image acquisition card that can automatically recognize dynamic target images is researched and implemented by applying FPGA technology.The performance of the capture card is verified by the vertical target accuracy test system where the array cameras intersect.This paper designs a high-speed image acquisition card based on FPGA.First,the A7 series FPGA of Xilinx company is selected as the main control chip of the high-speed image acquisition card.Then,the Camera Link protocol is used for data transmission,which can reach up to5.44 Gbps,so as to realize the transmission of image data.Real-time transmission,and the hardware circuit is used at the receiving end to decode the data format specified by the Camera Link protocol;then,in view of the limited internal storage resources of the FPGA,the MT41J64M16JT-15 DDR3 SDRAM external memory is used to realize the real-time storage of data.The read and write rate of the chip can reach up to 1600MB/s;finally,in order to realize the real-time transmission of the identified dynamic target image data to the host computer,the FT601 chip is used to realize the USB3.0 high-speed interface data transmission,and the identified target image is transmitted to the host computer display.A high-speed dynamic image recognition system based on FPGA platform is established.The system mainly consists of a data receiving module,a target recognition module,a high-speed data storage module and a data transmission module.In the target recognition module,in order to realize the real-time recognition of high-speed moving target images,the traditional interframe difference algorithm is improved and optimized,so that it can be realized on the FPGA platform;The operation controls the reading and writing of different storage spaces,and realizes the continuous storage of dynamic target images.A vertical target accuracy test platform with dual line scan cameras is built to verify the stability of the image acquisition card and the feasibility of the high-speed dynamic target recognition algorithm based on FPGA.Through the statistics and analysis of the test results for many times,it is verified that the image acquisition card can stably realize the automatic operation of the single-running target or the continuous-moving target under the hardware environment with a resolution of 4096×8 and a line frequency of 140 Khz.Real-time recognition,and the capture rate of target images can reach 99%.