红外图像非均匀性校正高通滤波算法的改进

红外焦平面阵列的非均匀性噪声是制约红外成像质量的主要因素。本文通过分析多种均匀性校正的方法，提出了一种时域高通滤波法的改进，在这种方法中增加了一个调节因子口，目的是为了调节系统的截止频率，选择合适的调节因子能够尽可能校正焦平面阵列的非均匀性。另外考虑到噪声的空域特性，建立了差图像Eij（n），用于替换噪声图像xij（n）。实验仿真通过图像的空间标准差证明，新算法具有较好的校正效果。

An Improve High Pass Filtering Algorithm for Nonuniformity Correction of Infrared Image

The nonuniformity noise in the infrared focal plane array is a major factor which limits the quality of infrared image.By analyzing some correction methods,an improved high pass filtering algorithm was presented.An adjusting gene(a) is added in this method to adjust the system cut-off frequency,which can help get a better nonuniformity correction in the infrared focal plane array.Considering spatial characteristic of the noise,the noise image xi,j(n) is replaced by the residual image Ei,j(n).The new algorithm comes to a better result of correcting proved by space standard deviation of picture in the experiment.