基于多项式逼近的红外系统渐晕效应校正方法

发布时间：2018-01-17 21:23

本文关键词：基于多项式逼近的红外系统渐晕效应校正方法　出处：《红外与激光工程》2016年S1期 　论文类型：期刊论文

【摘要】：渐晕效应是在红外成像时像平面中心区域较亮而边缘区域较暗的现象。渐晕效应对红外系统成像性能的影响非常严重,因此系统使用时有必要对渐晕效应进行校正。首先对渐晕效应的产生原因做了分析,然后提出了一种基于场景的渐晕校正方法。通过场景之间的方差信息提取背景,用多项式逼近背景灰度分布,得到校正因子,从而实现渐晕校正。为评价校正效果,提出具有统计意义的行间方差概念。分别利用星空和海面两种场景对校正方法进行验证。校正后行间方差减小到未校正行间方差的13.6%和3.8%,校正效果比较理想。
[Abstract]:The camber effect is a phenomenon that the center region of image plane is brighter and the edge area is darker in infrared imaging, and the effect of gradual halo effect on the imaging performance of infrared system is very serious. Therefore, it is necessary to correct the gradual halo effect when the system is used. Firstly, the cause of the gradual halo effect is analyzed. Then, a corona correction method based on scene is proposed. The background is extracted by variance information between scenes, and the correction factor is obtained by approximating the gray distribution of background by polynomial. In order to evaluate the effect of correction, the corona correction can be realized. The concept of inter-row variance with statistical significance is proposed. The calibration methods are verified by starry sky and sea surface respectively. After correction, the inter-row variance is reduced to 13.6% and 3.8% of the uncorrected inter-row variance. The correction effect is ideal.
【作者单位】：海军航空工程学院控制工程系;中国国防科技信息中心;
【基金】：国家自然科学基金(61303192)
【分类号】：TP391.41;TN216
【正文快照】： 0引言渐晕效应是指在红外系统成像过程中,远离光学系统光轴的物点成像时,像平面中心区域较亮,而边缘区域较暗的现象。红外系统成像一般对比度较低,成像质量远不如可见光成像,因此渐晕效应对红外系统的成像质量影响尤为严重。红外图像应用于精确测量或目标检测跟踪前有必要首先

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