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CSME 2023/06
Volume 44 No.3 : 221-230
 
Inspection of Defects on Whole Ball Surface by View-to-View Mapping Using Zernike Moments

Ku-Chin Lina and Min-Hsiung Maa
aDepartment of Mechanical Engineering, Kun Shan University Tainan, Taiwan, 71070, R.O.C.


Abstract: This study develops a novel approach for surface defect inspection of golfball using a view-to-view mapping based on a reduced set of Zernike moments. According to 1,000 random test views conducted in this study, the cycle time of inspection is about 2.0 seconds, which is very competitive to a commercialized deep learning system. With a proposed fine-tuning mechanism, the false alarm rate achieved is 0.6%. To our best knowledge, no such comparable data are available in literature. The proposed inspection algorithm equipped with a nonlogo detector using color thresholding works under uneven illumination. It is capable to detect simultaneously logo-attached and non-logo assembly defects of different shapes, sizes, and colors in a single view and resolution. The principle of the proposed view-to-view mapping is applicable for inspection of defects on a wide and highly-curved/plane surface where precise feature alignment for template matching is impractical to perform on line.

Keywords:  defect inspection, template matching, Zernike moments.

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© 2023  CSME , ISSN 0257-9731 





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