Abstract: In view of the fact that the size and symmetry of the blower rotor workpiece often appear to be inconsistent with the standard in industrial production, this paper uses the rotor workpiece images to design a rotor size and symmetry detection method based on the edge detection technology. In order to reduce the noise point of original image, the method performs noise reduction processing and binarization processing on the original image based on Gaussian filtering. On this basis, the edge detection algorithm based on Canny operator and the round fitting method based on the least square method are used to detect the holes inside the workpiece. At the same time, the improved Canny algorithm is used to detect the outer edge of the workpiece to obtain relatively continuous edge pixel points, and the comparison method and dynamic simulation experiment are designed to test the size and symmetry. The experiments show that the detection method proposed in this paper has a good effect on the detection of the size and symmetry of the rotor workpiece.

Key words: edge detection, size detection, symmetry detection, dynamic simulation