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J. Imaging 2018, 4(11), 133; https://doi.org/10.3390/jimaging4110133

Optimal Color Lighting for Scanning Images of Flat Panel Display using Simplex Search

1
Smart Manufacturing Technology Group, KITECH, 89 Yangdae-Giro RD., CheonAn, ChungNam 31056, Korea
2
MACHINE&VISION, 2302 Venture Center, ChungNam Techo Park, 136 JikSanRo, CheonAn, ChungNam 31035, Korea
*
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 28 October 2018 / Accepted: 7 November 2018 / Published: 12 November 2018
(This article belongs to the Special Issue Computational Colour Imaging)
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Abstract

A system for inspecting flat panel displays (FPDs) acquires scanning images using multiline charge-coupled device (CCD) cameras and industrial machine vision. Optical filters are currently installed in front of these inspection systems to obtain high-quality images. However, the combination of optical filters required is determined manually and by using empirical methods; this is referred to as passive color control. In this study, active color control is proposed for inspecting FPDs. This inspection scheme requires the scanning of images, which is achieved using a mixed color light source and a mixing algorithm. The light source utilizes high-power light emitting diodes (LEDs) of multiple colors and a communication port to dim their level. Mixed light illuminates an active-matrix organic light-emitting diode (AMOLED) panel after passing through a beam expander and after being shaped into a line beam. The image quality is then evaluated using the Tenenbaum gradient after intensity calibration of the scanning images. The dimming levels are determined using the simplex search method which maximizes the image quality. The color of the light was varied after every scan of an AMOLED panel, and the variation was iterated until the image quality approached a local maximization. The number of scans performed was less than 225, while the number of dimming level combinations was 20484. The proposed method can reduce manual tasks in setting-up inspection machines, and hence is useful for the inspection machines in FPD processes. View Full-Text
Keywords: flat panel display; inspection process; scanning image; light control; mixed color source; optimal illumination; simplex search method flat panel display; inspection process; scanning image; light control; mixed color source; optimal illumination; simplex search method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kim, H.; Ha, E.; Jin, K.; Kim, B. Optimal Color Lighting for Scanning Images of Flat Panel Display using Simplex Search. J. Imaging 2018, 4, 133.

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