自适应积分时间改变的红外焦平面非均匀校正方法

发布时间：2018-05-19 01:01

本文选题：红外焦平面探测器 + 非均匀校正　；参考：《红外与激光工程》2017年11期

【摘要】：基于黑体标定的红外焦平面校正方法,当探测器工作积分时间与校正参数获取时的积分时间不一致时校正效果会变差,究其原因主要是因为像元的响应输出随积分时间呈现一定的非线性,传统黑体定标类的校正方法属于积分时间维度上的单点校正。针对该问题提出了一种自适应积分时间改变的非均匀校正方法,该方法在辐射通量和积分时间两个维度上都进行多点校正,从而有效解决了变积分时间时校正效果变差的问题。另外,该方法直接存储原始黑体标定数据用于校正,不需要存储增益及偏置校正系数。使用局部非均匀性均值作为校正效果的评价方法,该评价方法更能反映校正后残差的局部特性。实验表明,相对于传统方法,该方法能够有效降低积分时间改变时校正后的图像非均匀性,提高了黑体定标类校正方法的工程适用性。
[Abstract]:The infrared focal plane correction method based on blackbody calibration will become worse when the working integral time of the detector is inconsistent with the integral time when the calibration parameters are obtained. The main reason is that the response output of the pixel is nonlinear with the integral time, and the traditional blackbody calibration method belongs to the single point correction on the integral time dimension. In order to solve this problem, a non-uniform correction method with adaptive integral time change is proposed. The method performs multi-point correction on both the radiative flux and the integral time, which effectively solves the problem of poor correction effect when the integral time is variable. In addition, the method stores the original blackbody calibration data directly for correction, and does not need to store gain and offset correction coefficient. Using the mean value of local nonuniformity as the evaluation method of correction effect, the evaluation method can better reflect the local characteristics of the corrected residual error. Experiments show that compared with the traditional method, the proposed method can effectively reduce the non-uniformity of the corrected image when the integral time is changed, and improve the engineering applicability of the blackbody calibration method.
【作者单位】：中国科学院大学;中国科学院上海技术物理研究所;中国科学院红外探测与成像技术重点实验室;
【基金】：中国科学院上海技术物理研究所创新基金(CX-60)
【分类号】：TN215

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