Moire fringe reduction by optical filters in integral three-dimensional imaging on a color flat-panel display

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.

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Moire Fringe Contourographic Determination of the Three-Dimensional Geometry of the Posterior Articular Surface of the Calcaneum

Biomechanics: Basic and Applied Research ◽

10.1007/978-94-009-3355-2_41 ◽

1987 ◽

pp. 309-314

Author(s):

P. Klein ◽

F. de Schryver

Keyword(s):

Articular Surface ◽

Three Dimensional ◽

Moire Fringe ◽

Moiré Fringe

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Three-dimensional angular measurement based on moiré fringe

10.1117/12.885821 ◽

2010 ◽

Author(s):

Wen-liang Wang ◽

Ji-chun Tan ◽

Li-xin Deng ◽

Hai-bo Liu ◽

Jian-kun Yang

Keyword(s):

Three Dimensional ◽

Angular Measurement ◽

Moire Fringe ◽

Moiré Fringe

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A Novel Method for Hull's Three Dimensional Deformation Measurement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.344.93 ◽

2013 ◽

Vol 344 ◽

pp. 93-98 ◽

Cited By ~ 5

Author(s):

Xin Ming Liu ◽

Yao Yu Zhang ◽

Xiao Yong Feng ◽

Qian Xue Wang

Keyword(s):

Optical Sensor ◽

Twist Angle ◽

Three Dimensional ◽

Angle Measurement ◽

Deformation Measurement ◽

Dynamic Experiments ◽

Moire Fringe ◽

Novel Method ◽

Moiré Fringe ◽

Dynamic States

In this paper, a novel method for hulls three-dimensional angle measurement is presented. For the measurement of the transverse twist angle, a method based on moiré fringe is proposed, for the lengthways flexibility and course flexibility angle the conventional optical sensor method is applied. The principle of the measurement is discussed in detail. To verify the accuracy of the proposed method, both static and dynamic experiments are carried out. Results show that in the static states, the accuracy for them are smaller than 5'', in the dynamic states, the accuracy for them are smaller than 10''.

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