第18卷第9期 2010年9月
文章编号
1004924X(2010)09-211607
光学精密工程
Optics and Precision Engineering
Vol.18No, 9
Sep.2010
线阵相机场曲复原及在异纤检测中的应用
王季12，陆文凯1
（1.清华大学自动化系智能技术与系统国家重点实验室，北京100084：
2.煤炭科学研究总院西安研究院，陕西西安710054）
摘要：为了消除相机的场曲给成像带来的空变模糊，提高图像分辨率和检测精度，针对在工业检测中广泛使用的线阵相机，提出了一种消除场曲影响的一维图像复原方法。在分析了空变模糊矩阵结构的基础上，通过估算部分区域的点扩散函数，再由偏移和播值得到全像场范围内的模糊矩阵。由模糊矩阵利用约束最小二乘法得到与观测信号无关的复原矩阵。检测过程中，将采集到的图像信号与复原矩阵相乘，获得复原后的图像。采用检测棉流内异性纤维的异纤检测系统，用含有较细异纤的实际数据对方法进行验证。结果表明，本方法在提高图像边缘处分辨率的同时增强了异常点与背
景的差异，异常比增加了10%以上，为进一步提高检测精度创造了条件。关键调：线阵相机；场曲；约束最小二象；空变模糊；图像复原
中图分类号：TP391.4O438
文献标识码：A
doi; 10. 3788/OPE, 20101809. 2116
Restorationoffieldcurvedimagefromlinecamera and its applications in foreign fiber detecting
WANG Jil.?, LU Wen-kai
(l.StateKeyLaboratory of IntelligenceTechnology and System,Departmentof
Automatics,TsinghuaUniversity,Beijing100084,China;
2.XianResearchInstitute,ChinaCoalResearchInstituteXian710054,China)
Abstract: To eliminate the spatially variant blurs caused by a field curvature from a camera and to im-prove the resolutions and the mcasuring precisions of images, a 1D image restoration method was pro posed to overcome the influence of field curvature on an image from the camera used in industrial in-spections. On analysis of the spatially variant blur matrix, the Point Spread Functions(PSFs) of a partial region were estimated and then the blur matrix of whole image field was computed by shifting and interpolation. On the basis of the blur matrix, the restored matrix which was unrelated to the ob-served signal was obtained by the constrained least square algorithm. In inspection, the restored im-age could be obtained by multiplying the acquired signals with restored matrix. This method has been applied in foreign fiber detecting systems and verified by real images containing fine fibers. Obtained results show that this method can improve the image resolution and enhance the difference between
收稿日期：2009-09-26；修订日期：2009-12-11,
基金项目：国家863高技术研究发展计划资助项目（No.2006AA09A102-10）