| 自适应积分时间改变的红外焦平面非均匀校正方法 |
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| 引用本文： | 崔坤,陈凡胜,苏晓锋,蔡萍.自适应积分时间改变的红外焦平面非均匀校正方法[J].红外与激光工程,2017,46(11):1104001-1104001(7). |
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| 作者姓名： | 崔坤 陈凡胜 苏晓锋 蔡萍 |
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| 作者单位： | 1.中国科学院大学,北京 100049; |
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| 基金项目： | 中国科学院上海技术物理研究所创新基金（CX-60） |
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| 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。
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| 关 键 词： | 红外焦平面探测器 非均匀校正 黑体标定 局部非均匀性 |
| 收稿时间： | 2017-03-11 |
Adaptive non-uniformity correction method for IRFPA with integration time changing |
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| Affiliation: | 1.University of Chinese Academy of Sciences,Beijing 100049,China;2.Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;3.Key Laboratory of Infrared System Detection and Imaging Technology,Chinese Academy of Sciences,Shanghai 200083,China |
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| Abstract: | It was found that when the integration time of the detector was not consistent with the time when the correction parameters were obtained, the correction effect would get worse for the non-uniformity correction method of the infrared focal plane array detectors based on the blackbody calibration. The main reason was that the response of output pixel was nonlinear with integration time, and traditional blackbody calibration methods belonged to single point correction in the dimension of integration time. Aiming at this problem, an adaptive non-uniformity correction method for integration time changing was presented, which used multi-point correction method in two dimensions of radiation flux and integration time, thereby effectively solving the problem. In addition, this method used the actual response data as the calibration data, which can effectively save the parameter space. The mean value of local non-uniformity was used as the evaluation method of the correction effect, and the evaluation method could reflect the local characteristics of the residual after correction. Experimental results show that this method can effectively reduce the non-uniformity caused by the integration time changing compared with the traditional methods, and improves the engineering applicability of the methods based on the blackbody calibration. |
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