基于时空域滚动引导滤波的分尺度非均匀性校正算法

Scale-separated non-uniformity correction algorithm based on spatio-temporal rolling guidance filter

  • 摘要: 非均匀性是红外成像系统普遍存在的固有缺陷,主要表现为条纹和散粒状的固定模式噪声,造成图像质量严重退化。当前基于场景的非均匀性校正方法普遍依赖运动场景,静止场景容易被视为非均匀性,误校正会产生鬼影。为解决该问题,放弃对场景假设,从非均匀性自身特征出发,基于一维引导滤波结合递进校正和能量阻断机制校正大尺度的条纹非均匀性;对时域低通图像,基于滚动引导滤波的尺度感知和滤波收敛特性,通过求解最小均方误差下的线性校正模型参数,去除小尺度的散粒非均匀性。为验证算法的鲁棒性,使用缺乏运动场景开展模拟和实测实验,通过主客观评价,验证了本算法具有非均匀性校正残差小、抑制鬼影能力强、不过度校正、不对运动场景依赖等优点,且兼具对视频流和单帧图像的校正能力。

     

    Abstract: Non-uniformity is a common inherent defect in infrared imaging systems, mainly manifesting as streaks and granular fixed-pattern noise that severely degrade image quality. Current scene-based non-uniformity correction methods generally rely on moving scenes, and stationary scenes are easily assumed to be non-uniform, resulting in incorrect correction and ghosting artifacts. To solve the problem, the scene assumption was discarded to correct the large-scale strike non-uniformity based on one-dimensional guided filtering combined with progressive correction and energy blocking mechanism from the characteristics of non-uniformity. On the temporal low-pass image, based on the scale awareness and convergence properties of the rolling guidance filter, the small-scale scatter non-uniformity was corrected by solving the parameters of the linear correction model under the minimum mean square error. To verify the robustness of the algorithm, simulations and real experiments were performed on motionless scenes, and through subjective and objective evaluations, it was verified that this algorithm had the advantages of small non-uniformity correction residuals, strong ability to inhibit ghosting, no over-correction, no dependence on motion scenes, and had the ability to correct both video streams and single frame images.

     

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