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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。
When calibrating the infrared focal plane based on the blackbody calibration, the correction effect will be worse when the integration time of the detector and the integration time of the calibration parameters are different. The main reason is that the response output of the pixel exhibits a certain degree of non-integration with the integration time Linear, traditional blackbody calibration class calibration method belongs to the single-point integral time dimension correction. Aiming at this problem, a non-uniform correction method of adaptive integral time change is proposed. The proposed method performs multi-point correction in both radiant flux and integral time, which can effectively solve the problem that the correction effect becomes worse when the variable integral time problem. In addition, this method directly stores the original blackbody calibration data for calibration without the need to store gain and offset correction coefficients. The local non-uniform mean is used as the evaluation method of the correction effect, which can better reflect the local characteristics of the residual after correction. Experiments show that compared with the traditional method, this method can effectively reduce the non-uniformity of the corrected image when the integral time changes and improve the engineering applicability of the calibration method of blackbody calibration.