Research Of Infrared Thermal Imager Based On ARM And FPGA

With the continuous development and application of infrared thermal image technology, the infrared thermal imager increasingly embodys peculiar superiority from both army and civilian fields, presenting a great potential market and broad application future. However, due to the limit of present IRFPA detector's development, the effect of infrared thermal image is not yet satisfying,which also leads to the whole set system's high cost and imperfect application in reality. All the above comes that developing a set of infrared image real time dealing system with high effective modulariation will have profound meaning in both technology and market.After analyzing the characters values of infrared image noiese and comparison, we design and accomplish a set of modulized real-time infrared image processing system with the existing algorithm to improve the the image quality and the system's real-time feature.This task consists of the following:(1)After reading the extensive reference literature,A modularization platform with ARM and FPGA is accomplished on the real-time need of high speed data collection, transimit and dealing for infrared thermal imager.(2)We designed schematic successfully,high-speed PCB layout and anti-jamming for FPGA dealing module and ARM control module,analyzed and summarized the encountered problems in debugging process.(3)We gave a deep study on traditional algorithm of the infrared image and improved precision of the nonuniformity correction and extended nonuniformity correction range with nonlinear fitting correction methods; and improved the median filter algorithm for image noises,at the same time, we adopted the piecewise-linear transformation method and set thresholds of the background, transition zone and goal in infrared image flexibly in human-computer interaction mode to enhance the image processing and achieve the nonuniformity correction and pseudocolor transformation algorithm with FPGA hardware.(4)Windows CE system is customized and transplanted to the ARM module; drivers for matrix keyboard and related applications such as graphical interface of the infrared thermal imager are also developed.(5)Successfully debugging the dual RAM communication between dealing and control modules. And we achieved the friendly interface and multifunctional real-time infrared thermal imager design with exact temperature testing and high resolution colorful display.In contrast with the tradional infrared thermal imager, our designed system made use of FPGA hardware inherent parallelism structure and unique look-up table system to perform infrared image processing algorithm. It readlize the software algorthm hardware realization and make sure the real-time of the system ;the whole device used designing pattern of modularization, it is better in transplantation and easy to move, This infrared thermal imager can be widely used in application field such as night monitoring,infrared temperature measurement and NDT.etc.