问题描述
Python中的OpenCV提供以下代码:
OpenCV in Python provides the following code:
regions, hierarchy = cv2.findContours(binary_image, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
for region in regions:
x, y, w, h = cv2.boundingRect(region)
cv2.rectangle(image, (x, y), (x + w, y + h), (0, 255, 0), 1)
这会在轮廓内给出一些轮廓.如何在Python中删除它们?
This gives some contours within contour. How to remove them in Python?
推荐答案
为此,您应该看看本教程关于如何使用方法 findContours
返回的层次结构
对象.
For that, you should take a look at this tutorial on how to use the hierarchy
object returned by the method findContours
.
要点是,您应该使用 cv2.RETR_TREE
而不是 cv2.RETR_LIST
来获取群集之间的父/子关系:
The main point is that you should use cv2.RETR_TREE
instead of cv2.RETR_LIST
to get parent/child relationships between your clusters:
regions, hierarchy = cv2.findContours(binary_image, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
然后,您可以通过检查 hierarchy [0,i,3]
是否等于-1来检查索引为 i
的轮廓是否在另一个轮廓内.如果它不同于-1,则说明您的轮廓位于另一个轮廓内.
Then you can check whether a contour with index i
is inside another by checking if hierarchy[0,i,3]
equals -1 or not. If it is different from -1, then your contour is inside another.
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