焊缝检测区域的分段线性阈值增强算法
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摘要
针对曲线焊缝的图像受到诸多干扰而影响焊缝提取精度的问题,提出一种基于改进的分段线性阈值法的焊缝区域增强算法。首先,在空域通过引导滤波对焊缝图像进行平滑抑制干扰;然后,在频域通过改进的分段线性阈值法对焊缝区域进行增强。实验结果表明改进的焊缝区域增强算法在增强焊缝边缘的同时,能避免传统阈值法出现的重构振荡。
The interference existing in the images of curved weld may affect the extraction precision of weld seam. A weld area enhancement algorithm based on improved piecewise linear threshold method is proposed. The weld image is smoothed by guided filtering to suppress the interference in spatial domain,and then the improved piecewise linear threshold method is used to enhance the weld area in frequency domain. The experimental results show that the weld area enhancement algorithm can avoid the reconstruction oscillation produced by the traditional threshold method while enhancing the weld edge
The interference existing in the images of curved weld may affect the extraction precision of weld seam. A weld area enhancement algorithm based on improved piecewise linear threshold method is proposed. The weld image is smoothed by guided filtering to suppress the interference in spatial domain,and then the improved piecewise linear threshold method is used to enhance the weld area in frequency domain. The experimental results show that the weld area enhancement algorithm can avoid the reconstruction oscillation produced by the traditional threshold method while enhancing the weld edge
引文
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[3]刘源浻,黄楚勤,黄明,等.光切法视觉检测的焊缝坡口中心定位方法[J].电焊机,2017,47(3):54-58.LIU Yuanjiong,HUANG Chuqin,HUANG Ming,et al. Weld groove center location method based on light-section method in vision inspection[J]. Electric welding machine,2017,47(3):54-58.
[4]赵军,赵继,张雷.焊缝结构光图像处理与特征提取方法[J].西安交通大学学报,2013,47(1):114-119.ZHAO Jun,ZHAO Ji,ZHANG Lei. Image processing and feature extraction for structured light images of welded seam[J].Journal of Xi’an Jiaotong University,2013,47(1):114-119.
[5]李登峰,吴秀明,胡捷,等.线结构光焊缝表面质量监测方法[J].辽宁工程技术大学学报,2014,33(1):66-70.LI Dengfeng,WU Xiuming,HU Jie,et al. Design of weld surface quality detecting system based on line structured light[J].Journal of Liaoning Technical University,2014,33(1):66-70.
[6] XIAO C M,SHI Z L. Adaptive bilateral filtering and its application in retinex image enhancement[C]//2013 IEEE International Conference on Image and Graphics. Qingdao:IEEE,2013:45-49.
[7]卢斯伟,胡晓兵,文华,等.基于双边滤波算法下的焊缝跟踪系统研究[J].机械,2017,44(7):11-14.LU Siwei,HU Xiaobing,WEN Hua,et al. Seam tracking system based on bilateral filtering algorithm[J]. Machinery,2017,44(7):11-14.
[8]张利明,李建忠,刘国奇,等.基于局部二值模式的射线图像增强算法[J].无损检测,2014,36(5):23-26.ZHANG Liming,LI Jianzhong,LIU Guoqi,et al. Radiograph enhancement based on local binary pattern[J]. Nondestructive testing,2014,36(5):23-26.
[9]朱文杰,王广龙,高凤岐,等.引导滤波与视觉感知结合的自然场景轮廓提取[J].系统工程与电子技术,2017,39(1):206-214.ZHU Wenjie,WANG Guanglong,GAO Fengqi,et al. Natural scene contour detection by combining guided filter and visual perception[J]. Systems engineering and electronics,2017,39(1):206-214.
[10]董雪,林志贤,郭太良.基于LOG算子改进的自适应阈值小波去噪算法[J].液晶与显示,2014,29(2):275-280.DONG Xue,LIN Zhixian,GUO Tailiang. Improved self-adaptive threshold wavelet denoising analysis based on LOG operator[J]. Chinese journal of liquid crystals and displays,2014,29(2):275-280.