Research On Method Of Real Time Infrared Image Acquisition And Edge Detection Based On FPGA

Along with the development of infrared imaging technology,Infrared image has been widely used in people's production, life, national security and so on,especially in the field of fire detection and other security, but also has an important application value. Because Fire detection is related to the safety of people's lives and property, the requirement for reliability and reaction time of the detecting system has been put forward.however, Infrared image has many shortcomings, such as low resolution, more noise and so on, limited by the imaging device. So we need to use modern technology and design intelligent, portable, low-power embedded real-time infrared image acquisition system and then study the method of high speed processing of infrared image.In order to achieve this goal, this paper reviewed a large number of information related to embedded image acquisition system and image processing,at the same time analyses and summarizes the present situation of the domestic and international development and the problems existed in this field. According to the practical application background, this paper presented the design scheme of direct programming modeling based on FPGA and Verilog hardware description language. This paper focuses on the methods and ideas of real-time infrared image acquisition and processing by using FPGA programmable logic design method. The main content of research and design in this paper includes two parts: the design of infrared image real-time acquisition system and the FPGA realization of the infrared image processing algorithm.The infrared image real time acquisition system was designed based on FPGA. In order to meet the requirements of the complex environment such as fire detection, infrared image acquisition system needs to meet the design requirements of high efficiency, high speed and stability. This paper introduces the design of I2 C control module using FPGA and the method to control ADV7180 through I2 C bus for the original image acquisition by infrared thermal imager. Collected image went through image decoding, delete-interlaced processing, image conversion.Afterforward, the image data will be cached by the SDRAM cache controlled by SDRAM controller designed in high speed. The data read out of the cache can be used for image processing then we can use the VGA display control module designed of FPGA to control the display and realize real-time display. This paper studied the method of infrared image edge detection, and has realized the improved Sobel edge detection algorithm and Gauss filtering algorithm using FPGA.This paper realizes the design of infrared image real-time acquisition system, and based on this, this paper realizes the real-time, efficient edge detection and filtering of infrared image. The results of debug and experiment show that the method studied in this paper can achieve the functional requirements of the design.