Multispectral Imaging System Hardware Design And Implementation

The multi-spectral fusion imaging system is a system that can collect the related images and handle the post-processing images in complex environments.The multi-spectral fusion imaging system not only has a single infrared imaging system in poor lighting conditions or bad weather,but also has the characteristics that the visible light image system with rich details in daily environment.It can collect image and handle the image processing in all-weather and complex environments.In order to improve the existing single sensor imaging system,a set of complex hardware system integrating sCMOS high-speed sensor board,uncooled long-wave infrared sensor board and FPGA image processing board was designed.In view of the past,image processing hardware systems for the conventional DSP+FPGA architecture have disadvantages such as large size,complicated system,and high power consumption.This paper designs an image processing and transmission platform based on Zynq-7000 processor.In order to overcome the bottleneck of the existing infrared imaging equipment image processing capabilities,this system selected UL04371-042 sensor produced by ULIS,taking into account that the output of the infrared sensor is an analog signal and the output voltage amplitude is 1.0V ~ 4.2V,the highest output rate For 10 Mhz,this article designed a set of infrared acquisition circuit for the UL04371-042 sensor,using the AD9240 for the corresponding analog-to-digital quasi-changing,but taking into account the level of the AD9240's sampling clock and FPGA output clock level standards are inconsistent,Can easily lead to high and low judgments are wrong,this article added a set of level conversion circuit design,both to meet the infrared image acquisition rate and ensure the stability of infrared image acquisition process.This article combines the structure and working principle of the sCMOS device to analyze the imaging quality,taking into account the sCMOS sensor's operating voltage and bias voltage types are too many and there are strict power-up timing and accuracy requirements.In this paper,a set of power supply circuit design and bias circuit design for GSENSE2020 S are designed,and a variety of voltages are reasonably distributed and matched with the FPGA to control the power-up sequence.This provides a high-precision,strict power-up sequence circuit design for sCMOS.With the number and type of power chips,it is also possible to more flexibly control the voltage amplitude and power-up timing.In order to overcome the bottleneck of the existing infrared imaging equipment image processing capabilities,this system selected UL04371-042 sensor produced by ULIS,taking into account that the output of the infrared sensor is an analog signal and the output voltage amplitude is 1.0V ~ 4.2V,the highest output rate For 10 MHz,this article designed a set of infrared acquisition circuit for the UL04371-042 sensor,using the AD9240 for analog-to-digital conversion,but taking into account the level of the AD9240's sampling clock and the FPGA output clock level standards are inconsistent,Can easily lead to high and low judgments are wrong,this article added a set of level conversion circuit design,both to meet the infrared image acquisition rate and ensure the stability of infrared image acquisition process.In order to satisfy the needs of multi-spectral fusion imaging systems for different applications,this paper designed a rich set of high-speed communication interfaces.The designed interface includes: Gigabit Ethernet,optical fiber interface,Cameralink interface,UART interface.The different interfaces are suitable for different application fields,providing sufficient conditions for the secondary research and laying a solid foundation for the wide application of the multi-spectral fusion imaging system.In order to meet the needs of multi-spectral fusion imaging systems for different applications,this paper designed a rich set of high-speed communication interfaces.The designed interface includes: Gigabit Ethernet,optical fiber interface,Cameralink interface,UART interface and so on.The different interfaces are suitable for different application fields,providing sufficient conditions for the secondary development of subsequent R&D personnel and laying a solid foundation for the wide application of this multi-spectral fusion imaging system.