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Proceedings Paper

Shape measurement of the cold rolled strips using the rectangular fringe shift method
Author(s): HaSul Kim; Changhyun Park; Young Tae Shin; Jin Yang Jung
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Paper Abstract

For the shape measurement of the cold rolled strips, the new rectangular fringe shift method is introduced. The image saturation always occurs in the image center because of the total specular reflection of the strip surface. The central area saturation is reduced by using the circular gaussian density filter. Least-square fitting is used to find out the phase information of the strip. Phase map is obtained from the eight quasi-rectangular strip patterns and the shape of the object surface can be expressed by unwrapped phase map of 256 gray levels.

Paper Details

Date Published: 15 March 1998
PDF: 7 pages
Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); doi: 10.1117/12.302537
Show Author Affiliations
HaSul Kim, Pohang Iron & Steel Co., Ltd. (South Korea)
Changhyun Park, Pohang Iron & Steel Co., Ltd. (South Korea)
Young Tae Shin, Pohang Iron & Steel Co., Ltd. (South Korea)
Jin Yang Jung, Pohang Iron & Steel Co., Ltd. (South Korea)


Published in SPIE Proceedings Vol. 3399:
Process Control and Sensors for Manufacturing
Richard H. Bossi; David M. Pepper, Editor(s)

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