一种改进Canny算子的图像边缘检测方法  

Image edge detection method based on improved Canny operator

作　　者：包启龙 景会成 张靖轩 王一 杨富荃 BAO Qilong;JING Huicheng;ZHANG Jingxuan;WANG Yi;YANG Fuquan(College of Electrical Engineering,North China University of Science and Technology,Tangshan 063210,China;Green Intelligent Mining Technology Innovation Center of Hebei Province,Tangshan 063210,China;School of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]华北理工大学电气工程学院,河北唐山063210 [2]河北省矿山绿色智能开采技术创新中心,河北唐山063210 [3]河北工业大学电气工程学院,天津300130

出　　处：《现代电子技术》2024年第23期36-42,共7页Modern Electronics Technique

基　　金：河北省教育厅科学研究项目资助(CXY2024013);河北省省级科技计划资助(21314303D);唐山市科技计划项目(21130219C)。

摘　　要：针对传统Canny边缘检测算法不能处理椒盐噪声干扰,阈值选取依靠人工干预的问题,提出一种改进Canny算子的边缘检测算法。首先,提出一种改进的递归中值滤波取代高斯滤波,去除图像噪声的同时减少图像边缘信息的丢失;然后,利用双线性插值改进非极大值抑制对像素梯度值进行亚像素级别的定位;最后,采用基于迭代的Otsu阈值分割算法自适应地获取阈值并进行迭代式边缘连接,提高算法的自适应程度。实验结果表明,对比Canny算子、Sobel算子以及一种改进的Canny算法,在去噪图像质量评价指标上提高了8.5%,在边缘检测准确率上提高了22%,并且改进的算法去除椒盐噪声能力突出,自适应性强,检测出的边缘信息更完整,连续性更佳。The traditional Canny edge detection algorithm fails to deal with salt⁃and⁃pepper noise interference,and the threshold selection depends on manual intervention,so an edge detection algorithm based on improved Canny operator is proposed.An improved recursive median filtering is proposed to replace the Gaussian filter,which can reduce the loss of image edge information while removing image noise.Then bilinear interpolation is used to improve non⁃maximum suppression to locate the pixel gradient values at the level of sub⁃pixel.The iteration⁃based Otsu threshold segmentation algorithm is used to obtain the threshold value adaptively and perform the iterative edge connection,so as to improve the adaptive degree of the algorithm.Experimental results show that,in comparison with the algorithm based on Canny operator and the algorithm based on Sobel operator,the denoised image quality evaluation index of the proposed algorithm is improved by 8.5%,and its edge detection accuracy is improved by 22%.Moreover,the proposed algorithm has outstanding ability of removing salt⁃and⁃pepper noise,strong adaptability,more complete edge information detected and better continuity.

关 键 词：图像处理 CANNY 边缘检测 改进的递归中值滤波 双线性插值 基于迭代的Otsu阈值分割 

分 类 号：TN911-34[电子电信—通信与信息系统]