Real-Time Detection of Nickel Plated Punched Steel Strip Parameters Based on Improved Circle Fitting Algorithm

• Published in: Electronics (Basel) 2023-04, Vol.12 (8), p.1865
• Main Authors: Cao, Binfang, Li, Jianqi, Liang, Yincong, Sun, Xuan, Li, Weihao
• Format: Article
• Language: English
• Subjects: Accuracy; Algorithms; Cold punching; Datasets; Electric vehicles; Experiments; Hough transformation; Iterative algorithms; Least squares; Metal strips; Methods; Nickel plating; Parameters; Punching (Metalwork); Real time; Sheet-steel; Strip steel; Vision systems
• ISSN: 2079-9292; 2079-9292
• DOI: 10.3390/electronics12081865

Nickel-plated punched steel strip is a product obtained by punching holes on the surface of cold-rolled white sheet steel strip and then electrochemical nickel plating. It is necessary to make accurate and fast detection of punching circle parameters, since it is of crucial importance to ensuring the quality of nickel-plated punched steel strips. Accordingly, in this article, an improved circle fitting algorithm of nickel-plated punched steel strip is proposed. Firstly, the least squares fitting is performed to obtain the circle center and radius dataset by iterative algorithm with different values for the initial point positions and intervals. Then, the mean shift algorithm is used to optimize the results after iteration, and the segmented fitted circle centers are all concentrated around the true circle center to obtain the best radius and center coordinates. Finally, comparison experiments with different numbers of circular holes and verification experiments with nickel-plated punched steel strips are carried out. As the results show, the algorithm proposed in this article is more robust than the least squares algorithm in detecting multiple circles and has better real-time performance than the Hough transform. Therefore, it can meet the industrial production needs with high accuracy and real-time requirements, such as nickel-plated punched steel strips.