一条命令就可以搞定：
pip install opencv-contrib-python opencv-python
或者：
pip install opencv-contrib-python==3.4.0.12
下载网址：
https://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv
OpenCV, a real time computer vision library.
- opencv_python‑2.4.13.5‑cp27‑cp27m‑win32.whl
- opencv_python‑2.4.13.5‑cp27‑cp27m‑win_amd64.whl
- opencv_python‑3.1.0‑cp34‑cp34m‑win32.whl
- opencv_python‑3.1.0‑cp34‑cp34m‑win_amd64.whl
- opencv_python‑3.4.2+contrib‑cp35‑cp35m‑win32.whl
- opencv_python‑3.4.2+contrib‑cp35‑cp35m‑win_amd64.whl
- opencv_python‑3.4.2+contrib‑cp36‑cp36m‑win32.whl
- opencv_python‑3.4.2+contrib‑cp36‑cp36m‑win_amd64.whl
- opencv_python‑3.4.2+contrib‑cp37‑cp37m‑win32.whl
- opencv_python‑3.4.2+contrib‑cp37‑cp37m‑win_amd64.whl
- opencv_python‑3.4.2‑cp35‑cp35m‑win32.whl
- opencv_python‑3.4.2‑cp35‑cp35m‑win_amd64.whl
- opencv_python‑3.4.2‑cp36‑cp36m‑win32.whl
- opencv_python‑3.4.2‑cp36‑cp36m‑win_amd64.whl
- opencv_python‑3.4.2‑cp37‑cp37m‑win32.whl
- opencv_python‑3.4.2‑cp37‑cp37m‑win_amd64.whl
Pillow, a replacement for PIL, the Python Image Library, which provides image processing functionality and supports many file formats.
Use `from PIL import Image` instead of `import Image`.
- PIL‑2.0+dummy‑py2.py3‑none‑any.whl
- Pillow‑3.4.2‑cp36‑cp36m‑win32.whl
- Pillow‑3.4.2‑cp36‑cp36m‑win_amd64.whl
- Pillow‑5.2.0‑cp27‑cp27m‑win32.whl
- Pillow‑5.2.0‑cp27‑cp27m‑win_amd64.whl
- Pillow‑5.2.0‑cp34‑cp34m‑win32.whl
- Pillow‑5.2.0‑cp34‑cp34m‑win_amd64.whl
- Pillow‑5.2.0‑cp35‑cp35m‑win32.whl
- Pillow‑5.2.0‑cp35‑cp35m‑win_amd64.whl
- Pillow‑5.2.0‑cp36‑cp36m‑win32.whl
- Pillow‑5.2.0‑cp36‑cp36m‑win_amd64.whl
- Pillow‑5.2.0‑cp37‑cp37m‑win32.whl
- Pillow‑5.2.0‑cp37‑cp37m‑win_amd64.whl
- Pillow‑5.2.0‑pp260‑pypy_41‑win32.whl
- Pillow‑5.2.0‑pp360‑pp360‑win32.whl
另外有参考网址：
https://pypi.org/project/opencv-contrib-python/