Real-time surface defects inspection of steel strip based on difference image

Jia-hui Cong; Yun-hui Yan; Hai-an Zhang; Jun Li

doi:10.1117/12.790865

19 February 2008 Real-time surface defects inspection of steel strip based on difference image

Jia-hui Cong, Yun-hui Yan, Hai-an Zhang, Jun Li

Proceedings Volume 6625, International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications; 66250W (2008) https://doi.org/10.1117/12.790865
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

A method of difference image to inspect real-time defects for cold rolled steel strip is proposed, which is based on subtract arithmetic of image. That is, shooting a scene at different time subtraction or image of the same scene at different waveband subtraction. This paper outlines a subtraction operation between the gathering images and the standard images. The standard image selection utilizes sequence extraction technique, which is to extract background image as a standard image from the multi-frame continuous real-time processing of images, and the standard image is self adaptive update. In the course of image defect inspection, we divided the difference image into small regions and inspected them respectively with the character of defects being remarkable in part image. Through the experiment analysis, conditions can be obtained to judge if any defects exist. Experiment on five typical defects (wrinkles, inclusion, weld, holes and serrated edges) were done. The results show that this method can meet the requirements of defect inspection and a higher rate of correct identification can be achieved.

Citation Download Citation

Jia-hui Cong, Yun-hui Yan, Hai-an Zhang, and Jun Li "Real-time surface defects inspection of steel strip based on difference image", Proc. SPIE 6625, International Symposium on Photoelectronic Detection and Imaging 2007: Related Technologies and Applications, 66250W (19 February 2008); https://doi.org/10.1117/12.790865

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