Measuring Method for Diameter of Bearings Based on the Edge Detection Using Zernike Moment
Weipeng Zhang · The Open Automation and Control Systems Journal · 2015
In addressing the application problem of digital image technology in the high-precision measurement of the di- ameter of bearings, a measuring method for diameter of bearings based on the edge detection using Zernike moments is proposed. First, the images of bearings are subject to bilateral filtering based on wavelet transformation, and the images after pretreatment are subject to the initial setting of pixel level by using Laplacian of Gaussian operator. Then edges are positioned accurately by using the subpixel Zernike moments. The result shows that the positioning precision of edges is high with this method. A subpixel nondestructive detection of the external diameter of bearing is realized, and the detec- tion precision reaches the standards of industrial measurement. The edge detection performed in this study is to process the images of rolling bearings. The shapes of the edge are sim- ple. Considering the advantages and disadvantages of the introduced methods and the actual situation of measurement, the subpixel edge detection algorithm based on Zemike mo- ments is chosen. Its positioning precision and computation time are better than those of other space operators.