Detecting Height of Liquid Level with Computer Vision for Twin-roll Strip Casting

In twin-roll strip casting process, the height of the liquid level (LH) directly affects the casting stability and quality of strip. High accuracy and quick LH detection are essential for LH stability control. In this paper, an LH detection technique based on computer vision was introduced, involvin...

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Bibliographic Details
Published in:ISIJ International 2023/07/15, Vol.63(7), pp.1226-1232
Main Authors: Chen, Dong, Tang, Yang, Dou, Weixue, Li, Zhenlei, Yuan, Guo
Format: Article
Language:English
Subjects:
camera calibration
computer vision
height of liquid level
pseudo boundary
twin-roll strip casting
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Summary:In twin-roll strip casting process, the height of the liquid level (LH) directly affects the casting stability and quality of strip. High accuracy and quick LH detection are essential for LH stability control. In this paper, an LH detection technique based on computer vision was introduced, involving an easy calibration method and an efficient image processing method. It only requires the cameras to observe three different width whiteboards for camera calibration. To realize the highly precise and quick LH detection, a pseudo boundary caused by complicated casting process was emphasized and corresponding solutions were proposed. The application results show that the proposed method could achieve high precise and quick processing of LH detection, and the detection deviation can be controlled within ±2 mm of the target LH. Based on real-time LH detection, it could realize stable casting and minimize thickness deviation affected by LH fluctuation.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.ISIJINT-2022-352