Measuring Method for Diameter of Bearings Based on the Edge Detection Using Zernike Moment

ABSTRACT

In addressing the application problem of digital image technology in the high-precision measurement of the diameter 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 detection precision reaches the standards of industrial measurement.

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