Study on glass defect inspection method based on out-of-plane moire

作者：Jin Yong^*; Wang Zhaoba; Zhu Linquan; Yang Jiliang; Wei Bo

来源：Journal of Computational Information Systems, 2012, 8(9): 3921-3928.

• Band-reject filters
• Defect type
• First-order
• Glass defect
• Glass defect inspections
• Inspection methods
• Inverse Fourier transforms
• Linear CCD
• Out-of-plane
• Phase maps
• Ternary-valued image

The inspection method of glass defects based on transmissive out-of-plane moire was investigated. In this, dual CCFL is used as light source, and sinusoidal fringe on the glass ribbon is collected through Linear CCD. Fourier transform is used to process the moire fringe image, and the bandreject filter is designed to attenuate first-order spectrum while bandpass filter which has opposite characteristic to attenuate other frequencies except first-order spectrum. The inverse Fourier transform is used to acquire defects image and phase map respectively. Using two thresholds, segmentation of defects image is proposed to classify the defect types. The method of calculating dioptre based on phase map is raised. The results showed that the defects which can be detected were 0.1×0.1 mm minimal.

• 出版日期2012