光学触摸式投影机中亚像素边缘检测

Sub-pixel edge detecting in OTM

针对光学触摸式投影机中,像素级边缘检测不能满足测量精度要求的现状,提出亚像素寻边检测方法。该方法利用二次函数逼近高斯函数,将二次函数极值作为图像亚像素边缘,使边缘定位更加准确。实验结果表明:该亚像素边缘检测方法,能有效提高光学触摸式投影机图像边缘的检测精度。

Targeted at the failure of the pixel level edge detecting method to fulfill precise measurement in optics testing machine （OTM）, the paper presents an attempt to get a more precise measurement based on sub-pixel. The method involves using the second-order function to approach the Gauss function and taking extreme value as the sub-pixel level edge to make possible a more precise pixel level edge detection. Test results show that the sub-pixel edge positioning algorithm allows an effective improvement in the image edge detecting precision.