运动模糊图像恢复过程中的几个关键问题
刘微[1,2] 朱明[1] 李向荣[1,2] 宋华军[1,2]
[1]中国科学院长春光学精密机械与物理研究所,吉林长春130031 [2]中国科学院研究生院,北京100039
摘 要:
由于相机高速运动会导致图像模糊,在相机匀速运动假设的前提下,本文以维纳滤波算法为基础,给出了运动模糊图像的恢复模型。在用维纳滤波进行模糊图像恢复时,滤波参数λ会对振铃效应、鬼影效应以及噪声三者之间产生影响:当参数λ〈0.0001时出现振铃效应,当〉0.01时会出现鬼影效应;增大λ能减弱振铃效应和抑制噪声,但恢复图像的分辨率会降低。由于振铃效应和鬼影效应的存在,导致模糊图片恢复质量变差。图像的非周期性、点扩散函数的离散化以及A/D采样时x和y方向的比例非1:1等都是产生振铃效应和鬼影效应的因素,文中也对其做了详细分析。本文对振铃效应和鬼影效应的所有分析方法,不仅适用维纳滤波算法,也同样适用于其它图像恢复算法。[著者文摘]
文章出处:
《电子器件》-2005年28卷3期 -600-603页
分 类 号:
文献标识码:
A
文章编号:
1005-9490(2005)03-0600-04
Questions in Restoration of Motion-Blurred Image
Liu Wei;Zhu Ming;Li XiangRong;Song HuaJun
Abstract:
High speed motion of camera causes blur image. On the assumption of uniform motion of the camera , on the basis of Wiener filter algorithm, restoration model is presented on motion-blurred image. In restoring image with wiener filter, the filter parameter λ influences on ring, ghost and noise. When λ〈 0. 000 1, ring appears, and λ〉0.01, ghost appears. Increasing λ weakens ring and restrains noise, but decreases restoration image resolution. Ring and ghost cause poor image restoration from the results of non-periodicity of image, discretization of point spread function (PSF) and nonuniform property of A/D sampling in directions of x and y. All these are analyzed. The methods are suit to wiener filter algorithm, and also to other image restoration algorithm.[著者文摘]
Key words:
Wiener filter;motion blur;blurred image restoration, point spread function(PSF)

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