解决OpenCV ValueError: not enough values to unpack (expected 3, got 2)

opencv ValueError: not enough values to unpack (expected 3, got 2)

操作

# 找出所有轮廓
binary,contours, hierarchy = cv.findContours(binary, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_NONE)

报错信息

ValueError: not enough values to unpack (expected 3, got 2)

解决办法

查看版本
pip list
opencv-python  4.4.0.42

# 切换版本
pip install opencv-python==3.4.3.18 -i https://pypi.douban.com/simple


Installing collected packages: opencv-python
  Attempting uninstall: opencv-python
    Found existing installation: opencv-python 4.4.0.42
    Uninstalling opencv-python-4.4.0.42:
      Successfully uninstalled opencv-python-4.4.0.42
Successfully installed opencv-python-3.4.3.18

opencv 降版本就完了，虽然麻烦，但好使

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