Quick light mixing of multiple color sources for image acquisition using pattern search

Kim, Hyung-Tae; Cho, KyeongYong; Kim, SeungTaek; Kim, Jong-Seok; Jin, Kyung-Chan

doi:10.1007/s12541-015-0303-y

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…However, the gradient-based index is advantageous for the SPR patterns [29]. The sharpness for focusing was used for light control in previous studies [15][16][17]30], the gradient-based index was considered for lighting, and the Tenenbaum gradient was finally chosen [31].…”

Section: Image Correction and Indexmentioning

confidence: 99%

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

Kim

Jin

et al. 2018

J. Imaging

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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 2048 4 . The proposed method can reduce manual tasks in setting-up inspection machines, and hence is useful for the inspection machines in FPD processes.

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Section: Image Correction and Indexmentioning

confidence: 99%

“…The light from the color LEDs is integrated into a mixed color light using optical components, and the mixed light is transferred outward using an optical fiber [30]. The optical fiber is connected to a beam expander and generates a linear light in the FOV.…”

Section: Image Acquisition With a Mixed Color Sourcementioning

confidence: 99%

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

Kim

Jin

et al. 2018

J. Imaging

Self Cite

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“…presented a digital image processing for the color of flame. For color image processing, Lissner, Gu, Kim et al [4][5][6]. implemented a unified color space based on perceptual image processing .…”

Section: Introductionmentioning

confidence: 99%

Feature Extraction for Color Images

Han

2016

Electronics, Communications and Networks V

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The extraction of certain characteristics points such as color edge, inflection points, etc., is an imaging problem which requires urgent attention. This paper proposes a similar color segment algorithm. The algorithm is analyzed in different color distribution situations, and the extraction effect to the color is shown. Additionally, experimental analysis of the algorithms is provided. Experimental results indicate that the similar color segment algorithm performs better than existing algorithms in relation to a more obvious color edge, as it has better edge detection, stronger anti-noise ability, a faster processing speed and other advantages. Moreover, this paper compares the proposed algorithm to existing classical feature extraction algorithms.

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Automatic light control of an arbitrary color source for AMOLED inspection using random-search method

Kim

Jin

Kim

et al. 2017

2017 22nd IEEE International Conference on Emerging Technologies and Factory Automation (ETFA)

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Quick light mixing of multiple color sources for image acquisition using pattern search

Cited by 3 publications

References 13 publications

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

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

Feature Extraction for Color Images

Automatic light control of an arbitrary color source for AMOLED inspection using random-search method

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