尝试导入cv的“ DLL加载失败”（从OpenCV-python）

Question

When I try to execute import cv , the following error is raised:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified module could not be found.

I have installed it using pip install OpenCV-python also tried by installing from sourceforge.net (recent one) later copied cv2.pyd from build\\python\\x64 and pasted it in python 36\\Lib\\site-packages . I work on windows 10 64-bit

Answer 1

This error means your Python environment is unable to find the OpenCV module. You need to tell Python where to find it. Just to make things easier, use python 2 to run your script (python instead of python3) and try python 3 after python 2 works.

1. (Optional) Restart the system, just in case your system hasn't updated environment variables. Windows needs this.
2. Find the directory where you installed OpenCV. If you have multiple installations, please uninstall everything and install only 1, and make sure you take note of the installation directory.
3. Go to that installation directory, and in the subdirectory that contains the built files, search for the python module. It might look similar to this: C:\\opencv\\build\\python\\3.4.1 but it changes depending on your installation method.
4. We need to set an environment variable. Usually you go to Control Panel -> System and Security -> System and then click on the "Advanced system settings" link, then click on the "Environment variables" button near the bottom of the menu. This might change depending on your Windows version, but you can easily google this.
5. Look for a variable called PYTHONPATH. If you have it we'll append something to it, otherwise click the "New.." button under System for all users or User variables (for your account only) and for "Variable name" enter: "PYTHONPATH".
6. Set the "Variable value" to the path you found in (2). If appending to an existing variable, make sure paths are separated by ;
7. Restart the system. import cv should work now.