直线拟合方法在瓷砖角点定位中的应用

Linear fitting method in the application of tile corner location

在基于机器视觉的瓷砖尺寸检测系统中,为了定位瓷砖的角点,在检测到边缘以后,还要对边缘进行拟合。针对Hough变换拟合瓷砖边缘精度不高的问题,将Hough变换与最小二乘法相结合对瓷砖边缘进行拟合。先对边缘点作Hough变换,再取Hough变换得到的直线附近的点作最小二乘法拟合,从而定位角点。实验表明,本方法具有精度高和抗干扰能力强的特点,将其用于实际瓷砖尺寸检测,效果良好。

In the tile size detection system based on machine vision,in order to locate the tile corner point after the edge is detected,the edge is also fited. In this paper,because of the low accuracy of Hough transform in fitting tile edge,the Hough transform and least squares method are combinedly used to fit the tile edges. First,the Hough transform is applied to edge points,and then take points near the straight gotten by Hough transform for the least squares fitting,thus locating the corner. The experiments show that the method has a precision and anti-interference ability,for the actual tile size detection,to good effect.