如何使用图像处理库 opencv 和 python 语言提取材料的轮廓（2D 绘图）？

Question

• link: technical image
• The picture shows a technical drawing of a material. I have to contour this material with opencv python. The lines with a large thickness are the lines of the material. But if 3 small lines (indicating length, diameter) join, there is a material line and this is my problem. Thanks for your help.

Answer 1

I'm assuming you're doing something like this.

edges = cv2.Canny(gray, 50, 150)
_, contours, hierarchy = cv2.findContours(edges, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) 

You can increase the canny thresholds to only have thick edges.

edges = cv2.Canny(gray, 100, 300)