红外鱼眼成像系统非均匀性校正方法

分析了时域高通滤波校正算法中容易出现目标退化及“伪像”的问题，指出滤波方程的截止频率与信号频域分布的变化不匹配是产生问题的原因。结合红外鱼眼系统成像的特点，通过目标检测的方法分辨需要调整滤波截止频率的像元，对其采用不同的时域高通滤波方式，即改变滤波器的截止频率，有效地减少了目标退化和伪像的影响。采用主观和客观评价指标对试验的红外序列图像进行评价，结果表明改进的时域高通滤波校正方法效果明显。

Nonuniformity correction method for infrared fish-eye system

The cause of the target fade-out and the ghosting artifact in temporal high pass filtering nonuniformity correction(THPF-NUC)for infrared imaging system is studied.It is found that the mismatching of the filter cut-off frequency with the target spectral distribution change is the cause of the problem.Based on the characteristic of infrared fish-eye imaging system,the pixels of object are separated and applied to different filters with different cut-off frequency.By this way the target fade-out and the ghost...