一种利用切线和法线方向信息提取边缘的方法

目的　提取图像中的阶跃型边缘 ,为图像精密尺寸检测奠定基础 .方法　利用象素切线和法线方向两边与中心象素等距的象素点之间的明显灰度差值来判断是否为边缘点 .结果　该方法可以很好地提取具有阶跃型边缘性质的图像边缘 .结论　利用切线和法线方向信息提取图像的阶跃边缘的方法是可行的

A Method of Using the Information from Tangent and Normal Directions to Pick up Edges

Aim\ To pick up the step edges of images, and to build a well base for precise measure detection. Methods\ Use the evident gray difference between the gray value of tangent direction pixels or normal direction pixels and the gray value of center pixel to judge whether it is a edge pixel or not. Results\ This method can effectively gain the step edges of X ray images. Conclusion\ The method by using the information from tangent and normal direction to pick up edge is feasible.