| Due to its advantages of strong penetration ability and long working time,uncooled infrared imaging technology has shown great application value and development space in forests,coal mine fire prevention and power detection.However,subject to the technical limitations of the infrared detector itself and the influence of the harsh detection environment,the imaging effect of the infrared imaging system is not ideal,often there are problems such as low contrast and blurry imaging,and the image processing realized by the software has been unable to meet the needs of real-time and high efficiency,and this problem requires adding real-time image processing functions to the electronic processing part of the infrared system.Therefore,this thesis combines uncooled infrared imaging technology,image processing technology and Ethernet transmission technology to design an FPGA-based uncooled infrared movement system for remote real-time monitoring of forest and coal mine fires or power failures.This thesis introduces the composition and working principle of the uncooled infrared imaging system in detail,analyzes the influence of detector performance indicators on the entire uncooled infrared imaging system,studies the characteristics of infrared images and the factors affecting the quality of infrared imaging,and discusses the improvement of infrared image imaging quality from three aspects:image noise reduction,enhancement and sharpening,so as to provide theoretical guidance for system design.A comparative analysis of multiple system architectures proves that the overall system scheme design adopts Zynq-7000 series chips based on FPGA+ARM architecture as core processors with the advantages of small size and high integration,and the scheme uses FPGA as the main data acquisition and processing unit and ARM as the data transmission unit.According to the technical realization of the entire uncooled infrared imaging movement system,the hardware circuit design of the entire system is completed,mainly including the digital uncooled infrared detector RTD6122C,driving circuit,data acquisition circuit and display equipment,so as to realize the collection,processing,storage,transmission and display of infrared image information of the target.In the software design process of infrared video transmission processing system,the PL part adopts the design idea of sub-module and redundancy,and first uses the hardware description language Verilog to realize the detector timing drive and image acquisition logic design,and realizes the simulation verification through Vivado software.Secondly,aiming at the problems of low contrast and blurry imaging of infrared images,the commonly used image processing algorithms in image noise reduction,sharpening and enhancement are studied,and the median filtering algorithm,Laplace sharpening algorithm and pseudo-color shading algorithm suitable for the system are selected by Matlab software simulation and transplanted to the system hardware platform,as well as the configuration of format conversion module and video storage module.Finally,in the synthesis and implementation stage of hardware system engineering,the design tools are used to integrate the design of each module,generate bitstream files,and program through bitstream files to complete the development of the entire top-level system.The PS end mainly initializes and drives the VDMA,designs the 100 Gigabit Ethernet data transmission module based on UDP protocol,and designs the infrared video host computer based on QT.After testing and verifying the system functions,it is proved that the system can realize the functions of real-time acquisition and long-distance transmission of infrared video.In addition,after analyzing and comparing the system’s hardware resource occupancy,power consumption and algorithm processing speed,it is proved that the FPGA-based uncooled infrared core system designed in this thesis has the characteristics of low power consumption,high real-time performance,high integration and high scalability. |
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