OpenCV旧版,返回三个参数:
im2, contours, hierarchy = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
要想返回三个参数:
把OpenCV 降级成3.4.3.18 就可以了,在终端输入pip install opencv-python==3.4.3.18
OpenCV 新版调用,返回两个参数:
contours, hierarchy = cv2.findContours(mask, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)