基于加权引导滤波与时域高通滤波的非均匀性校正算法  

Non-uniformity correction algorithm based on weighted guided filter and temporal high-pass filter

作　　者：钱润达 赵东 周慧鑫 于君娜[2] 王士成[2] 荣生辉 Qian Runda;Zhao Dong;Zhou Huixin;Yu Junna;Wang Shicheng;Rong Shenghui(School of Physics and Optoelectronic Engineering,Xidian University,Xi'an 710071,China;The 54th Research Institute of China Elecronics Technology Group Corporation,Shijiazhuang 050081,China)

机构地区：[1]西安电子科技大学物理与光电工程学院,陕西西安710071 [2]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《红外与激光工程》2018年第12期139-144,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(61401343;61675160);国家高技术研究发展计划(2014AA8098089C);中国科学院光谱成像技术重点实验室开放基金(LSIT201503);高等学校学科创新引智计划(B17035)

摘　　要：为解决基于传统时域高通滤波红外图像非均匀性校正算法存在"鬼影"现象以及固定图案噪声去除不彻底的问题,提出了一种加权引导滤波和改进时域高通滤波相结合的非均匀性校正算法。首先,利用加权引导滤波准确分离红外图像中的空域高频成分;然后,计算红外图像中像素点灰度值变化幅度;最后,在进行时域高通滤波时对红外图像中的运动区域和静止区域使用不同时间常数进行校正。采用两组真实红外图像序列进行实验,并与经典的双边滤波时域高通,均值滤波时域高通非均匀性校正算法进行比较。实验结果表明:文中所提算法在主观视觉和客观评价指标方面优于其他两种算法,有效降低了红外图像的非均匀性,不会产生"鬼影",取得了较好的非均匀性校正效果。The drawbacks of traditional temporal high pass filter were"ghost artifacts"and fixed pattern noise can′t be removed completely.A non-uniformity correction algorithm that combines weighted guided filter and improved temporal high pass filter was proposed.Firstly,weighted guided filter was used to separate spatial high frequent components from infrared images accurately.Then,the change amplitude of every pixel value was calculated.Finally,different time constants were applied to motion regions and static regions to conduct non-uniformity correction.Two real infrared sequences were adopted in experiments,and space low-pass and temporal high-pass(SLTH)as well as bilateral filter based temporal high-pass filter(BFTH)were used to compare with the proposed algorithm.The experimental results show that the proposed algorithm is superior to the other two algorithms in subjective visual effect and objective evaluation inder.The proposed algorithm can reduce non-uniformity without causing"ghost artifacts"and achieves a better effect of non-uniformity correction.

关 键 词：红外焦平面阵列 非均匀性校正 加权引导滤波 运动判断 时域高通滤波 

分 类 号：TN219[电子电信—物理电子学]