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清华大学学报(自然科学版)  2015, Vol. 55 Issue (5): 592-596    
  电机工程 本期目录 | 过刊浏览 | 高级检索 |
漏磁图像的改进灰度级—彩色变换法
彭丽莎1, 王珅1, 刘欢2, 黄松岭1, 赵伟1
1. 清华大学 电机系, 电力系统国家重点实验室, 北京 100084;
2. 中国矿业大学(北京) 机电与信息工程学院, 北京 100083
Improved gray-color transform method for MFL images
PENG Lisha1, WANG Shen1, LIU Huan2, HUANG Songling1, ZHAO Wei1
1. State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
2. School of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
全文: PDF(1117 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 漏磁图像的伪彩色图比灰度图具有更好的辨识效果。该文在2种传统的伪彩色编码方法的基础上, 提出了一种改进的灰度级—彩色变换法。首先根据漏磁特点确定变换的初步分段线性表达式, 再利用最大类间方差法对灰度值进行聚类划分, 计算出表达式各段的节点值, 最终得到变换后的伪彩色图像。该方法根据实际的灰度值数据确定变换的具体表达式, 具有良好的自适应性。通过实验对比, 该方法得到的图像清晰且颜色鲜明, 更有利于漏磁特征识别。
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彭丽莎
王珅
刘欢
黄松岭
赵伟
关键词 漏磁图像伪彩色图像灰度级-彩色变换法最大类间方差法    
Abstract:Magnetic flux leakage (MFL) systems using pseudocolor images give better identification than grayscale images. This study combines two traditional pseudocolor coding methods into an improved gray-color transform method. Firstly, the initial transform piecewise linear expression is determined from the magnetic flux leakage characteristics. Then, the Ostu method for grey value clustering is used to get the expression node values. The transformed pseudocolor images are then obtained using the improved expression. This method based on the actual gray value to get the specific expression has good adaptability. Real tests show that this method gives clearer, more vivid images, which give better MFL characteristics identification.
Key wordsmagnetic flux leakage image    pseudocolor image    gray-color transform method    Otsu method
收稿日期: 2014-08-24      出版日期: 2015-08-04
ZTFLH:  TG115.28  
通讯作者: 黄松岭,教授,E-mail:huangsling@tsinghua.edu.cn     E-mail: huangsling@tsinghua.edu.cn
引用本文:   
彭丽莎, 王珅, 刘欢, 黄松岭, 赵伟. 漏磁图像的改进灰度级—彩色变换法[J]. 清华大学学报(自然科学版), 2015, 55(5): 592-596.
PENG Lisha, WANG Shen, LIU Huan, HUANG Songling, ZHAO Wei. Improved gray-color transform method for MFL images. Journal of Tsinghua University(Science and Technology), 2015, 55(5): 592-596.
链接本文:  
http://jst.tsinghuajournals.com/CN/  或          http://jst.tsinghuajournals.com/CN/Y2015/V55/I5/592
  图1 灰度级伪彩色变换原理
  图2 改进的分段线性编码显示的伪彩色图
  表1 内壁矩形缺陷尺寸列表
  图3 某大矩形缺陷的各种漏磁图像
  图4 某小矩形缺陷的漏磁图像
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