Automatic optical flank wear measurement of microdrills using level set for cutting plane segmentation

Authors:
Guifang Duan;Yen-Wei Chen;Takeshi Sukegawa
Affiliations:
Ritsumeikan University, Graduate School of Engineering and Science, 5258577, Kusatsu, Japan;Ritsumeikan University, College of Information Science and Engineering, 5258577, Kusatsu, Japan;Technical & Development Division, Remixpoint, 1070051, Tokyo, Japan
Venue:
Machine Vision and Applications - Integrated Imaging and Vision Techniques for Industrial Inspection
Year:
2010

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Abstract

We address the problem of automatic optical flank wear measurement for microdrill bits’ inspection. Cutting plane segmentation of microdrill bits is a fundamental step in the measurement. However, in the case of smeared microdrill bits, cutting planes cannot be segmented correctly by conventional methods. To exactly extract the cutting plane, a level set technique is proposed to segment it from a drill bit image; then we adopt a projection profile-based method for measuring the features of flank wear of microdrills. A new feature of flank wear, called “end wear length”, is also introduced for flank wear evaluation with three other existing features. Experimental results indicate that it is a robust and effective approach for automatic flank wear measurement of microdrills in printed circuit board (PCB) manufacturing.