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论文类型：期刊论文

发表时间：2012-10-01

发表刊物：MEASUREMENT

收录刊物：SCIE、EI、Scopus

卷号：45

期号：8

页面范围：2041-2051

ISSN号：0263-2241

关键字：Cylindrical forging; Dimensional measurement; Binocular vision; Feature points; Center points; Light stripes

摘要：The dimensional measurement of large forgings under high temperature plays an important role in product control. Cylindrical forgings belong to the important products in the forging workshop. In this paper, an improved online measurement method based on binocular vision for the dimensions of hot cylindrical forgings is proposed. Firstly, images of hot cylindrical forgings are captured by two CCD cameras, and the distorted light stripes projected onto hot cylindrical forgings can be resolved from the image by the deviated stripe model. Then, an accurate sub-pixel extraction algorithm of center points of the light stripes is developed for making the extraction of center points of the lights stripes more accurate. Moreover, for changing the field of view of cameras to measure different sections of forgings in the process of manufacturing, the fundamental matrix F is automatically calculated by matching the intersecting points of the projected light stripes in different images, without interrupting the forging process. Finally, experiments on measuring the diameters of hot cylindrical forgings in the workshop are conducted, and the experimental results indicate that the proposed measurement method is effective. Besides, an additional experiment in the laboratory verifies that the relative error of measuring diameters by the presented method is less than 0.7%. (C) 2012 Elsevier Ltd. All rights reserved.