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红外焦平面阵列各探测元响应的非均匀性降低了图像的质量和温度分辨率,定标类和场景类校正算法为解决该问题提供了可行的途径.传统的基于黑体定标的校正算法由于其简单有效而被广泛使用,但是其缺点在于依赖黑体及其相关控温装置.本文提出了一种改进的基于积分时间定标的两级校正算法.在保持入射辐射不变的情况下,首先通过改变积分时间得到系列响应数据,然后利用最小二乘法估计出两点校正所需的初始校正系数,并对不同积分时间下的响应数据进行初校正,最后估计出一点校正系数.实验结果证明该方法具有计算量小、校正准确度高的优点,可取得优良的校正效果,并易于在硬件平台中实现.
The nonuniformity of the detector elements in the infrared focal plane array reduces the image quality and temperature resolution, and the calibration class and the scene class correction algorithm provide a feasible solution to the problem.Traditional blackbody calibration based calibration algorithms Its simple and effective but widely used, but its drawback is that it depends on the blackbody and its related temperature control device.This paper presents an improved two-stage calibration algorithm based on integral time calibration.In the case of keeping the incident radiation unchanged, the first Through changing the integration time, a series of response data are obtained, then the least square method is used to estimate the initial correction coefficient needed for the two-point calibration, and the initial calibration is made for the response data under different integration time. Finally, a little correction coefficient is estimated. The method has the advantages of small amount of calculation and high accuracy of correction, can achieve good correction effect, and is easy to implement in the hardware platform.