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26 November 2007 Online measuring method for PCB film using linear CCD
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Printed circuit board film is used for making PCB. Size and defects are important parameters in PCB films' quality evaluation. An online measuring method based on linear CCD for 500mm width PCB film was proposed. The method included (1) definition of parameters, (2) imaging range, which was wider than a PCB film unit to reduce the errors coming from the assembling of CCD and (3) the 2D scanning of PCB film and CCD. Template matching was used for extracting the interested region. Region growing was used for pinhole detection. Image subtraction was used in breakage detection. And region segmentation was used for size measurement. According to the design and analysis, the online measuring method can meet the demands. Experiments showed that (1) the method can detect and classify PCB films' defects efficiently, and (2) the size measuring accuracy can reach 0.1mm.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ting Ye, Kaihua Wu, and Fei Zhuang "Online measuring method for PCB film using linear CCD", Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 68290M (26 November 2007);


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