Dr. Kuang-Che Chang Chien Profile

Dr. Kuang-Che Chang Chien

at Chinese Culture Univ

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Proceedings Article | 21 June 2019 Paper

Digital holographic imaging for optical inspection in learning-based pattern classification

Han-Yen Tu, Kuang-Che Chang Chien, Chau-Jern Cheng

Proceedings Volume 11056, 1105606 (2019) https://doi.org/10.1117/12.2525946

KEYWORDS: Defect detection, Digital holography, Diffraction, Image classification, 3D image reconstruction, Optical inspection, Glasses, Digital watermarking, Digital imaging, Defect inspection

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High demand of optical inspection is increased to guarantee manufacture and product quality in industries. To overcome limitations of the manual defect inspection, machine vision inspection is needed to efficiently and accurately screen the undesired defects on various products. Recently, the transparent substrate is becoming widely used for manufacturing optics and electronics products. For high-grade transparent substrates, development of machine vision inspection has increased its importance for inspecting defects after production. To perform machine vision inspection for the transparent substrate, the exposure procedure and analysis of the capturing image are critical challenges due to its properties of reflection and transparency. However, conventional machine vision systems are performed for optical inspection based on two-dimensional (2D) intensity images from the camera-based photography without phase and depth information, and may decrease inspection accuracy as well as defect classification. Conversely, instead of the 2D intensity image by camera-based photography with complicated algorithms and time-consuming computation, digital holography is a novel three-dimensional (3D) imaging technique to rapidly access the whole wavefront information of the target sample for optical inspection and complex defect analysis. In this study, we propose digital holographic imaging of transparent target sample for optical inspection in learning-based pattern classification, which a novel complex defect inspection model is presented for multiple defects identification of the transparent substrate based on 3D diffraction characteristics and machine learning algorithm. Both theoretical and experimental results will be presented and analyzed to verify the effective inspection and high accuracy.

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