Design Of Moving Target Detection System Based On FPGA

Since the end of the 20th century,with the development of computer vision,intelligent monitoring technology has received widespread attention and has become a current research hotspot.Moving target detection is a key link in intelligent monitoring,and it is of great significance to select a suitable algorithm to implement it on hardware.Because FPGA is composed of a large number of programmable logic function blocks,it has the flexibility of reprogramming,and because of its parallel operation and pipeline operation characteristics,it is very suitable for realizing the target detection algorithm that requires real-time and high operation speed.The research in this paper is based on FPGA as the core.First,the hardware platform and the real-time display system platform are designed,and then the target detection and some filtering algorithms are transplanted to the system platform to realize the FPGA-based moving target detection.This paper firstly compares and analyzes the inter-frame difference and the four-frame difference algorithm on Matlab,and concludes that under the same threshold,the four-frame difference algorithm has higher detection accuracy for the moving target area.After that,the hardware platform is designed,and the timing is analyzed according to the user manual of the selected device.The image acquisition module,SDRAM storage module and VGA display module are designed in the Quartus II using Verilog language to build a real-time display system platform.Subsequently,the image algorithm is designed.Aiming at the problem that the four-frame difference algorithm needs to store four frames of images continuously,this paper proposes a method of combining Bank switching and DQM,so that SDRAM can store four frames of images at the same time,because the image data is continuously transmitted Yes,in order to ensure the phase AND operation of the four frames of data after the difference,and at the same time solve the problem of excessive image data,a method of combining RAM buffering,serial-parallel conversion and parallel-serial conversion is proposed.In order to eliminate possible image noise,the binary image after the four-frame difference is processed by morphological filtering,and the closed operation module is designed.In order to make the detection result more intuitive,the smallest bounding box module is designed.All the above modules are Perform simulation analysis in Moselsim.Finally,the designed algorithm modules are instantiated into the real-time display system platform one by one to realize the detection of moving targets.