%0 Journal Article
%T 漏磁图像的改进灰度级—彩色变换法<br>Improved gray-color transform method for MFL images
%A 彭丽莎
%A 王珅
%A 刘欢
%A 黄松岭
%A 赵伟
%J 清华大学学报（自然科学版）
%D 2015
%X 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。<br>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.
%K 漏磁图像
%K 伪彩色图像
%K 灰度级-彩色变换法
%K 最大类间方差法
%K &lt
%K br&gt
%K magnetic flux leakage image
%K pseudocolor image
%K gray-color transform method
%K Otsu method
%U http://jst.tsinghuajournals.com/CN/Y2015/V55/I5/592#MetricsTab