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Frequency Domain Pre-Processing for Automatic Defect Inspection of TFT-LCD Panels  

Nam, Hyun-Do (단국대학교 공과대학 전자전기공학부)
Nam, Seung-Uk (단국대학교 대학원 전기공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.57, no.7, 2008 , pp. 1295-1297 More about this Journal
Abstract
Large-sized flat-panel displays are widely used for PC monitors and TV displays. In this paper, frequency domain pre-filter algorithms are presented for detection of defects in large-sized Thin Film Transistor-Liquid Crystal Display(TFT-LCD) panel surfaces. Frequency analysis with 1-D, 2-D FFT methods for extract the periodic patterns of lattice structures in TFT-LCD is performed. To remove this patterns, frequency domain band-stop filters were used for eliminating specific frequency components. In order to acquire only defected images, 2-D inverse FFT methods to inverse transform of frequency domain images were used.
Keywords
Automatic Defect Inspection; Flat Panel Display; Vision; Frequency Domain Filters;
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  • Reference
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