正交励磁的损毁字符磁光成像复原  

Magneto-Optical Imaging Restoration Method for Damaged Characters with Orthogonal Excitation

作　　者：高飞 李学勇[1,2] 张硕 路长厚[1,2] Gao Fei;Li Xueyong;Zhang Shuo;Lu Changhou(Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,School of Mechanical Engineering,Shandong University,Jinan 250061,Shandong,China;National Demonstration Center for Experimental Mechanical Engineering Education,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]山东大学机械工程学院高效洁净机械制造教育部重点实验室,山东济南250061 [2]山东大学机械工程国家级实验教学示范中心,山东济南250061

出　　处：《激光与光电子学进展》2023年第10期291-298,共8页Laser & Optoelectronics Progress

基　　金：国家重点研发计划资助项目。

摘　　要：为了对机器设备损毁字符的标识码信息进行显现复原,提出一种正交励磁的损毁字符磁光成像复原识别方法。在研究钢材基体字符对磁场传导的影响机理的基础上,设计能分时正交励磁的环形电磁铁模型,并且通过仿真分析验证了该模型的正确性。采用局部直方图均衡化法对通过正交励磁获得的字符磁光图像进行增强,以突出字符的笔划特征;设计像素级显著值加权平均的融合算法,实现了正交励磁获得的所有方向上笔划特征的融合。设计实验系统,获得正交方向励磁的磁光图像,并对算法的效果进行实验测试。结果表明:局部直方图均衡化增强的磁光图像字符笔划对比度大,分辨率高,算法的增强效果理想;像素级显著值加权融合算法对字符磁光图像进行融合时,可以全方位、高效率提取字符图像的所有方向特征,且融合后图像清晰度高。所提正交励磁的损毁字符磁光成像复原方法能有效复原损毁严重、笔划复杂的字符。To recover the identification code information of damaged characters of mechanical equipment,this paper proposes a magnetooptical imaging restoration method for damaged characters with orthogonal excitation.Based on the study of the influence mechanism of steel matrix characters on magnetic field conduction,a ring electromagnet model with timesharing orthogonal excitation is developed,and the effectiveness of the model is verified through simulation analysis.First,to enhance the magnetooptical images of characters obtained by orthogonal excitation,we employ the local histogram equalization method to highlight the stroke features of characters.Then,we design the fusion algorithm of pixellevel significant value weighted average to fuse the images.The experimental system was designed to obtain magnetooptical images with orthogonal directional excitation,and the effectiveness of the proposed algorithm was evaluated through experiments.The results show that the magnetooptical images enhanced by local histogram equalization have large contrast of character strokes and high resolution,verifying the effectiveness of the proposed algorithm.Furthermore,the pixellevel salient value weighted fusion algorithm can comprehensively and efficiently extract all directional features of the character images when fusing the magnetooptical images of damaged characters,and the fused images have high definition.Therefore,the proposed magnetooptical imaging restoration method for damaged characters with orthogonal excitation can effectively recover severely damaged characters with complex strokes.

关 键 词：磁光成像 正交励磁 局部直方图均衡化 像素级显著值 

分 类 号：TM271[一般工业技术—材料科学与工程] TP391.1[电气工程—电工理论与新技术]