基于改进的多项式插值亚像素法电缆护套材料厚度测量  

Polynomial Interpolation Based on an Improved Sub-pixel Method of Thickness Measurement of Cable Sheath Material

作　　者：王吉林[1] 姚励[2] 赵力[2] 

机构地区：[1]盐城工学院信息工程学院,江苏盐城224051 [2]东南大学信息科学与工程学院,南京210096

出　　处：《电测与仪表》2009年第12期25-28,32,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(60872073;60472058);江苏省自然科学基金资助项目(BK2008291)

摘　　要：基于图像的测量技术具有测量精度高、动态范围大、灵活性好等优点,如今已广泛被用在几何尺寸测量领域。亚像素定位是其中一项关键的技术,可实现对目标优于整像素精度的定位。针对普通多项式插值亚像素定位法丢失了边缘点的方向信息,造成计算精度下降的缺点,提出了基于改进的Sobel边缘检测插值法,并将其应用到电缆护套材料的厚度图像测量系统中,使插值算法进行亚像素定位后的边缘坐标更加符合实际边界的情况,实现了精确快速的测量。Image measurement technology has been widely used in geometry measurement field because of its high accuracy, large dynamic range and good flexibility. Sub-pixel positioning is one of the key technologies which can achieve positioning better than entire pixel accuracy. In this paper, we put forward an improved interpolation method based on Sobel edge detection, the ordinary polynomial interpolation for sub-pixel positioning method lost the direction information of the edge point which resulted in the shortcomings of the decreased calculation accuracy. Then applying it to the cable sheath material thickness measurement making the interpolation algorithm the edge coordination even more tallies with the actual edge, finally it achieved a precise and fast measurement system.

关 键 词：亚像素 插值法 电缆护套材料 厚度测量 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]