How To Remove A Contour Inside Contour In Python OpenCV?
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 =
Solution 1:
For that, you should take a look at this tutorial on how to use the hierarchy
object returned by the method findContours
.
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)
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.
Solution 2:
img_output, contours, hierarchy = cv2.findContours(blank_image_firstImage, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
This removes the child contour
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