关键词: 机器视觉, 图像检测, 弧形件, 亚像素坐标, 离散曲率

Abstract: In order to achieve fast and accurate inspection on the feature parameters of the arcshaped piece, the paper presented a method that inspected feature parameters of the arc-shaped piece based on machine vision. First, the image edge was extracted by Canny operator and subpixel coordinate was computed by a cubic spline interpolation algorithm. Then, discrete curvature was computed by discrete curvature computing method based on tangent direction. The discrete curvature data were arranged; the mean and variance, as well as the arc-length, surface and angle of curved pieces were calculated. The experimental results indicate that the proposed method is of not only highprecision, high-speed but also good-stability, and can satisfy inspection requirement of arc-parts feature parameters.

Key words: machine vision, Image inspection, Arc-Parts, Sub-pixel coordinate, Discrete curvature