Center-point coordinate vision automatic extraction method for row billet end face

• Main Authors: Chunmei WANG, Fengshan HUANG, Yusong REN, Fuxiang ZHANG, Jingbo ZHOU
• Format: Article
• Language: zho
• Published: Hebei University of Science and Technology 2018-06-01
• Series: Journal of Hebei University of Science and Technology
• Subjects: image processing; a row billet; center coordinate extraction; corner detection; boundary extraction; image coordinate
• Online Access: http://xuebao.hebust.edu.cn/hbkjdx/ch/reader/create_pdf.aspx?file_no=b201803011&flag=1&journal_

In order to realize rapid extraction of the center coordinates for row billet end faces when labeled by multi-strand billet end face labeling robot, a research program is proposed that the image coordinates in billet end face image are extracted and then the center point's coordinates of the billets end face image are calculated. Firstly, an improved SUSAN corner detection algorithm is proposed to solve the corner leak detection problem caused by the distance between the adjacent billet image edge being too small and the billet image corner angle being the arc angle. Then, the image plane coordinates of corners point are extracted, and the number of the billets end faces image in each enclosed area is calculated. Finally, a method for extracting the coordinates of slant billet end faces is provided, and the center point image plane coordinates of each billet end face are calculated, respectively. The robot labeling experiment of each billet end face in a row billet is carried out, and experimental results indicate that the horizontal and vertical labeling position error ranges of each billet end face are -0.625~0.850 mm and -0.550~0.875 mm, respectively, meeting the enterprises' allowed center coordinates position error value 1 mm of the billet end face fully. The visual methods mentioned in this paper are feasible in both theoretical and practical applications, and it not only provides an accurate labeling position for the continuous blank end labeling robot, but also provides a reliable method for extracting the center coordinates of rectangular image elements, and has some application value.