一种改进的亚像素偏移算法研究  

An Improved Algorithm of Sub-pixel Offset

作　　者：周虹[1] 罗晓曙[1] 何富运[1] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004

出　　处：《广西师范大学学报（自然科学版）》2010年第1期170-173,共4页Journal of Guangxi Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(70571017);广西信息与通讯技术重点实验室开放基金(20903)

摘　　要：研究了一种改进的亚像素偏移算法,设置正切阈值,根据偏微分的比值和正负确定边缘点的梯度方向,然后在梯度图像中对已确定的单像素宽边缘点进行伪边缘抑制,最后沿其梯度方向进行梯度幅值函数的二次抛物线插值,计算亚像素偏移量。实验结果证明该算法实现速度快,检测精度良好,适用于精度要求不是非常高的情况下的工业自动化在线快速图像测量任务。An improved sub-pixel offset algorithm is studied. Setting tangent threshold,the gradient direction of edge is determined by the ratio and the positive or negative sign of partial differential. Then it inhibits pseudo-edge of the identified single-pixel wide edge points in gradient image. Finally,it carries on the quadratic parabolic interpolation of gradient amplitude function along its gradient direction, and calculate sub-pixel offset. Experimental results show that this algorithm has short running time and high detection accuracy and can be applied to the industrial automation online fast image measurement tasks while in the condition of not very high precision.

关 键 词：亚像素偏移 图像测量 边缘细化 梯度方向 抛物线插值 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]