15 March 1998 Shape measurement of the cold rolled strips using the rectangular fringe shift method
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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.
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HaSul Kim, HaSul Kim, Changhyun Park, Changhyun Park, Young Tae Shin, Young Tae Shin, Jin Yang Jung, Jin Yang Jung, } "Shape measurement of the cold rolled strips using the rectangular fringe shift method", Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); doi: 10.1117/12.302537; https://doi.org/10.1117/12.302537
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