改进型自适应分段的红外焦平面非均匀校正方法

发布时间：2018-03-29 17:39

本文选题：红外焦平面探测器　切入点：非均匀校正　出处：《红外技术》2017年03期

【摘要】：制冷型红外焦平面探测器的响应非均匀性对其定量化应用产生很多不利影响。本文在对红外焦平面探测器像元响应特性深入研究的基础上,提出了一种的改进型自适应分段的红外焦平面非均匀校正算法。该方法主要在前人研究的基础上给出校正效果与分段校正阈值选择之间的定量化关系,从而降低了分段校正时阈值选择的盲目性。另外,该方法采用归一化直线作为校正的目标曲线,而非传统方法中采用分段目标曲线。文中首先分析了线性校正误差的来源,然后给出校正效果与分段阈值之间的定量化关系,最后给出校正方法的原理和步骤。在校正效果评价方面,本文使用局部非均匀性(LNU)来评价校正后的效果,该方法相对于传统的评价方法,更能体现校正后残差的局部特性。实验表明,相对于传统的多点校正法,该方法使用较少的参数量获得更好的校正效果,并且易于工程实现。
[Abstract]:The nonuniformity of the response of the cooled infrared focal plane detector has a lot of adverse effects on its quantitative application. In this paper, the response characteristics of the infrared focal plane detector pixel are deeply studied. An improved adaptive segmented infrared focal plane nonuniformity correction algorithm is proposed. The quantitative relationship between the correction effect and the threshold selection of segmented correction is given based on previous studies. Therefore, the blindness of threshold selection in segmental correction is reduced. In addition, the normalized line is used as the corrected target curve, and the segmented target curve is not used in the traditional method. In this paper, the source of linear correction error is first analyzed. Then the quantitative relationship between correction effect and segmented threshold is given. Finally, the principle and steps of correction method are given. In the aspect of correction effect evaluation, this paper uses local nonuniformity (LNU) to evaluate the corrected effect. Compared with the traditional evaluation method, this method can better reflect the local characteristics of the residual error after correction. Experiments show that compared with the traditional multi-point correction method, this method has better correction effect with less parameters and is easy to be realized in engineering.
【作者单位】：中国科学院上海技术物理研究所;中国科学院大学;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(No.CX-60)
【分类号】：TN215

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