Technique for simulating anisoplanatic image formation over long horizontal paths
Technique for simulating anisoplanatic image formation over long horizontal paths
复制标题
模拟长水平路径上的等差图像形成的技术
DOI：
10.1117/1.oe.51.10.101704
复制
发表时间：
2012
影响因子：
1.3
通讯作者：
M. Roggemann
中科院分区：
文献类型：
--
作者：
J. Bos;M. Roggemann
摘要。在水平成像路径上湍流的存在严重降低了成像系统的分辨率，并在图像框架中引入了各向异性畸变。各种图像处理技术正在开发，可以减轻这些影响，并通过模拟创建的高保真图像序列在他们的发展是有用的。在本文中，我们描述了一种简化的分步波传播方法，该方法采用一系列均匀间隔的相位屏来精确模拟湍流对水平路径上成像的影响。采用该方法，对三种湍流条件分别生成1000帧图像。每像素强度的均方误差也被评估为每帧与衍射限制的参考比较。对每帧强度误差统计数据的检查表明，这些误差是对数正态分布的，其平均值与湍流强度近似线性增加。
Abstract. The presence of turbulence over horizontal imaging paths severely reduces the resolution available to imaging systems and introduces anisoplanatic distortions in the image frame. A variety of image processing techniques are being developed which can mitigate these effects, and sequences of high-fidelity images created via simulation are useful in their development. In this paper, we describe a simplification of the split-step wave propagation method that employs a series of uniformly spaced phase screens to accurately simulate turbulence effects on imaging over horizontal paths. Employing this method, a series of 1000 image frames were generated for each of three turbulence conditions. The mean squared error in intensity per pixel is also evaluated for each frame in comparison to a diffraction-limited reference. Examination of the per-frame intensity error statistics indicate these errors are log-normally distributed about a mean value that increases approximately linearly with turbulence strength.