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
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.
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2015, Vol. 55 
