面向大光度变化图像的阈值自适应Canny算子  

Improved Adaptive Canny Operator for Large Photometric Variation

作　　者：胡璟懿 匡尧 余铮 王敬靖 张兰澜 刘云飞 HU Jingyi;KUANG Yao;YU Zheng;WANG Jingjing;ZHANG Lanlan;LIU Yunfei(State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430077,China;Information and Communication Company of State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]国网湖北省电力有限公司,湖北武汉430077 [2]国网湖北省电力有限公司信息通信公司,湖北武汉430000

出　　处：《机械与电子》2022年第8期18-22,27,共6页Machinery & Electronics

基　　金：国网湖北省电力有限公司科技项目(52153320002G)。

摘　　要：传统Canny算子需要手动设定高低阈值,当输入图像光照均匀且均值变化较小时,可以采用预先设定阈值的方式实现,但当输入图像遭遇大光度变化,灰度值均值产生较大波动时,预先设定高低阈值往往无法适应实际工况。提出了一种通过结合图像预处理和自适应阈值来解决Canny算子阈值调整困难的方法,克服了大光度变化图像中的阈值设定问题,并将其应用到透视变换过程中,解决了输入图像角度问题。实验结果表明,所提方法能够很好地解决大光度变化的应用场景问题。The traditional Canny operator needs to manually set the high and low thresholds.When the input image is evenly illuminated and the mean value changes little,it can be achieved by setting the thresholds in advance.However,when the input image encounters large luminosity changes and the average gray value fluctuates greatly,the preset high and low thresholds often cannot adapt to the actual working conditions.In this paper,a method to solve the difficulty of threshold adjustment of Canny operator by combining image preprocessing and adaptive threshold is proposed,which overcomes the problem of threshold setting in images with large luminosity changes,and it is applied to the process of perspective transformation to solve the problem of input Image angle problem.Experiment results show that the proposed method can solve the application scene problem with large luminosity change very well.

关 键 词：光学字符识别 大光度变化 CANNY算子 自适应阈值 图像预处理 

分 类 号：TP391.1[自动化与计算机技术—计算机应用技术]