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第7卷第4期 智能系统学报 Vol.7 No.4 2012年8月 CAAI Transactions on Intelligent Systems Aug.2012 D0I:10.3969/j.issn.1673-4785.201111012 网络出版地址:htp://www.cnki.net/kcms/detail/23.1538.TP.20120712.1042.006.html 图像复原中的模糊参数估计 王伟1,郑津津,刘星,周洪军2,沈连馆 (1.中国科学技术大学精密机械与精密仪器系,安徽合肥230027;2.中国科学技术大学国家同步辐射实验室,安徽 合肥230029) 摘要:图像复原技术在航空拍摄和机器视觉中是提高图像质量的重要手段.针对有相对运动情况的图像存在的降 质模糊,分析了运动模糊的数学原理,针对不同运动模糊采取了不同去模糊方式.即先判断图像存在的运动模糊方 式,针对直线运动通过Hog变换法和误差参数法相结合的方法估计降质参数,而对于旋转运动则采用曲线拟合和 极坐标转换相结合的方法来估计降质参数.通过维纳滤波方法复原图像,提高图像质量.利用提出的自适应方法对 直线运动模糊(参数为(30,70°))和旋转运动模糊(参数为(128,128),20°)分别作了实验计算.对比实验表明,这种 由粗及精的方法能准确估计模糊参数,与传统处理方法相比,更加便捷有效 关键词:运动模糊;Hough变换-参数曲线;圆心拟合;极坐标变换 中图分类号:1P18文献标志码:A文章编号:16734785(2012)04031506 Estimation of blur parameters in image restoration WANG Wei,ZHENG Jinjin',LIU Xing,ZHOU Hongjun2,SHEN Lianguan (1.Department of Precision Machinary and Precision Instrumentation,University of Science and Technology of China,Hefei 230027, China;2.National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China) Abstract:The image restoration technique is an important way to improve the quality of images,especially in flight photography and machine vision.In this paper,the mathematic principle was analyzed first,and then different de- blurring methods were employed correspondingly for each motion condition;specifically,the type of motion blur was judged.For linear motion blur,both the Hough transform and error-parameter were taken to estimate parame- ters.Furthermore,for rotational motion blur,the curve-fitting and polar transform were combined to estimate de- graded parameters.Both were followed by Wiener filtering to recover images and improve image vision quality.The proposed adaptive algorithm was used to calculate the linear motion blur parameter (30,70)and rotational motion blur parameter ((128,128),20).The results show that the algorithm can estimate blur parameters accurately. Compared with traditional handling,this proposed method has the advantages of high precision,robustness,and speed. Keywords:motion blur;Hough transform-parameter curve;center fitting;polar transformation 运动模糊大多数情况下是由相机抖动造成的, 间,不可避免地得到拍摄结果不满意的模糊图像.从 很多情况下没有足够的光照来避免使用长曝光时 单独一张运动模糊图像恢复出一张非模糊图像在数 字图像处理领域一直是个基础性研究问题.如果模 收稿日期:2011-11-17.网络出版日期:201207-12. 糊核(或者叫点扩散函数)是线性移不变的话,问题 基金项目:国家自然科学基金资助项目(10575097,10775128,61073109); 高校博士点基金资助项目(20060358050);国家自然基金大科 就简化成了图像去卷积.图像去卷积又可以分成盲 学装置联合基金资助项目(10979065);“111”工程资助项目 恢复和非盲恢复.在非盲恢复的情况下,运动模糊核 (B07033). 通信作者:王伟.E-mail:wwei009@mail.ustc.ed加.cm. 认为是已知或者已经计算得到的,剩下的任务就是
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