中文摘要：

亚像素算法是一种高精度的边缘检测算法。分析了亚像素边缘检测的原理及现有算法的优缺点，根据现有用亚像素对表面贴装元器件图像检测的算法，提出了三次样条插值的亚像素算法进行边缘提取。通过实验比较，认为该方法提高了边缘提取的精度，满足了贴片机视觉检测的要求。

英文摘要：

Sub-pixel algorithms is a high accuracy edge detection method, the detection principle and the performance of the method were analyzed. Based on the common sub-pixel techniques on determining the precision of component, a sub-pixel algorithm was proposed for component image segmentation based on 3- spline interpolation, The experiment results demonstrate that the proposed algorithm enhances the precision of edge detection and satisfies the requirement of vision detecting in SMC （surface mounting machine ） mounting.