Efficient restoration of space-variant blurs from physical optics by sectioning with modified Wiener filtering
Efficient restoration of space-variant blurs from physical optics by sectioning with modified Wiener filtering
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DOI：
10.1016/s1051-2004(02)00004-0
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发表时间：
2003-01-01
影响因子：
2.9
通讯作者：
Mikhael, WB
中科院分区：
文献类型：
--
作者：
Costello, TP;Mikhael, WB
利用维纳滤波技术，可以有效地恢复被未校正的物理光学的空间变化的点扩散函数所欺骗的数字图像。帧大小必须被定制以适应大视场角下物理点扩展函数的位移相关扩展和移位，以防止圆形卷积边缘效应破坏帧的中心部分。我们定义的部分作为非重叠的子帧用于构建复合全图像恢复。否则，如果帧太小，边缘效应误差可能会延伸到部分中，从而在复合恢复中引起伪影。相反，如果帧太大，则总恢复处理将大于所需。通过调整帧大小与字段位移，我们证明了有效的恢复图像模糊的实验室级球面透镜。模糊图像的模拟，然后恢复与修改维纳滤波器。均方误差和恢复的改善作为一个功能的视场角和标准的框架和部分尺寸的选择。(C)2002 Elsevier Science（美国）。All rights reserved.
Digital images bluffed by space-variant point-spread functions of uncorrected physical optics may be efficiently restored using Wiener filtering on overlapping subimage frames. Frame size must be tailored to accommodate the displacement-dependent spreading and shifting of physical point-spread functions at large field angles to prevent circular convolution edge effects from corrupting the frame's central section. We define the section as the nonoverlapping subframe used to construct the composite full-image restoration. Otherwise, if the frame is too small, edge-effect errors may extend into the section, inducing artifacts in the composite restoration. Conversely, if the frame is too large, total restoration processing will be greater than necessary. By adjusting frame size with field displacement, we demonstrate the effective restoration of images blurred by a laboratory-grade spherical lens. Blurred images are simulated and then restored with a modified Wiener filter. Mean-square-error and restoration improvement are reported as a function of field angle and criteria are developed for frame and section size selection. (C) 2002 Elsevier Science (USA). All rights reserved.