Design of Automotive Stamping Part Size Measurement System Based on Sub Pixel Accuracy
A dimension measurement method based on sub pixel accuracy is proposed to address the issues of low detection efficiency and difficulty in ensuring measurement accuracy in manual measurement of automo-tive stamping parts.Firstly,image acquisition and preprocessing were performed on automotive stamping parts.Then,the Canny operator and improved Zernike moment were used to extract subpixel edges from stamping parts images.Then,the extracted circular contours were fitted using Hough transform,and the pre-cise dimensions of the outer circle diameter and three inner hole diameters of the stamping parts were ob-tained.The measurement accuracy of the four circular contours was higher than 0.025 mm,and the standard deviation of multiple measurement results was less than 0.009 6 mm.A size measurement system based on sub pixel accuracy has been established,and the measurement platform and software system have been devel-oped.The non-contact sub pixel level accuracy measurement of automotive stamping dimensions has been a-chieved,which can meet the requirements of rapid and continuous measurement in industrial applications.
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