An image-based LCD positioning system utilizing the modified FHT method

Authors: Lin, Chern-Sheng1; Lay, Yun-Long2; Huan, Chia-Chin1; Chang, Hsing-Cheng1; Hwang, Thong-Shing1

Source: Optik – International Journal for Light and Electron Optics, Volume 114, Number 4, 1 June 2003 , pp. 151-159(9)

Publisher: Urban & Fischer

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Abstract:

In this paper, a LCD positioning system based on an image processing method is described. This method is effective in finding the angle of the geometric features in the cross registration mask. However, when two marks appear in the same frame, the problem of situation verification becomes more complex. We use an algorithm that assists with calculating the location and rotation angle for two marks precisely and quickly using the Fast Hough Transform (FHT). This method determines the locations of two masks and calculates the rotation angle from a blurred edge to adjust the LCD position and orientation.

Document Type: Research Article

DOI: http://dx.doi.org/10.1078/0030-4026-00240

Affiliations: 1: Department of Automatic Control Engineering, Feng Chia University, Taichung, Taiwan, R.O.C. 2: Department of Electronics Engineering, National Chin-Yi Institute of Technology, Taichung, Taiwan, R.O.C.

Publication date: June 1, 2003

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