基于SOPC的非制冷红外图像校正系统的研究

Uncooled Infrared Imaging System Based on SOPC

为解决传统红外热成像系统在图像校正处理过程中因其对处理浮点数的系统资源以及算法复杂度要求很高而导致的处理速度缓慢、无法实时处理图像的问题，文章提出研制基于片上可编程（system on programmable chip，SOPC）的非制冷红外图像校正系统。该系统的实现是在两点校正原理的基础上，考虑现场可编程门阵列（field—programmable gate array，FPGA）的结构特点，利用将浮点校正系数转化为定点型数据设计的思想创建Nios嵌入式处理器的定制指令，将复杂的顺序指令简化为硬件实现单指令，用硬件实现校正算法。实验结果表明：基于SOPC的红外图像校正系统生成的图像比较清晰，校正过程简单，能够有效提高红外焦平面阵列非均匀性校正的速度，从而解决红外成像技术中的实时性难题。

To solve the problem of slow processing speed and being unable to process image in real-time caused by large float processing system resource and high complexity of algorithm in the image correction of traditional infrared imaging system, an uncooled infrared image correction system based on system on programmable chip is proposed, based on elaborating the principle of two-point correction and taken the structure characteristics of FPGA into consideration, the system makes use of changing float correction coefficients into fixed-point data, and creates Nios embedded processor customed instructions, as a result, the complex instruction sequence is reduced to the single instruction of hardware, so we can realize the correction algorithm through the hardware. Experiment results show that the image from the infrared image correction system based on SOPC is much clearer, and the correction process is so simple that the nonuniformity correction speed of the infrared focal plane array has been improved effectively ,which solves the real time problem in the infrared imaging technology.