使用 opencv 处理图像
安装：https://pypi.org/project/opencv-python/
使用：https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_setup/py_table_of_contents_setup/py_table_of_contents_setup.html
示例：https://www.askaswiss.com/2016/01/how-to-create-pencil-sketch-opencv-python.html
打包 exe：https://pypi.org/project/auto-py-to-exe/
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