采样红外成像系统的混淆效应研究

对红外焦平面阵列而言, 欠采样产生的混淆效应严重影响成像质量。基于红外焦平面阵列的成像过程, 在时间域分析了探测器的采样过程, 在频率域定量研究了混淆效应对图像的影响, 根据混淆产生的机理, 分别对周期目标和非周期目标进行仿真实验。实验结果表明: 对周期目标会有混淆失真现象, 改变了图形的几何形状, 对于非周期图像会产生锯齿条纹。指出在低空间频率内混淆影响小, 噪声对图像的影响占主导地位, 而在高空间频率内混淆失真严重, 噪声影响小, 这对消除图像混淆的影响、系统参数设计等方面具有一定的参考价值。

Abstract

Under sampling leads to aliasing effect which have seriously effect on the image quality for infrared focal plane arrays. According to the imaging processing of staring system, sampling process of detector was analyzed in the time domain to study aliasing effect on image quality using a quantitative method in the frequency domain. Simulation experiment on aliasing phenomenon of periodic and aperiodic objects based on the reason of aliasing effect was completed. Simulation experiment show that aliasing distortion phenomenon will be exist in periodic objects, but there will be zigzag stripe in aperiodic objects. It can be concluded that aliasing distortion is small in low frequency and noise tends to mask the target pattern, but aliasing distortion is serious in high frequency where aliasing is dominant, this has a certain reference value for eliminating the influence of aliasing confusion and system parameter design.

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史浩然, 李召龙, 沈同圣, 娄树理. 采样红外成像系统的混淆效应研究[J]. 红外与激光工程, 2016, 45(4): 0404003. Shi Haoran, Li Zhaolong, Shen Tongsheng, Lou Shuli. Aliasing effect of sampled infrared imaging system[J]. Infrared and Laser Engineering, 2016, 45(4): 0404003.

采样红外成像系统的混淆效应研究

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