Unable to import cv2; Msgstr "Error loading DLL"

Question

I really did not want to start my own question with this, because this seems to be a common mistake here. However, after spending several hours on it now and after every thread that I could find, none of these answers sorted it out for me.

Therefore, my only option is to provide all the information I can about the setup, and I hope that one of you can recognize the problem.

I am running Windows 10 (x64) and have installed the following prebuilt binaries from the collection here .

• python 3.5.0-win32 (installed from the python website)
• numpy 1.10-cp35-win32
• matplotlib 1.4.3-cp35-win32
• opencv 3.0.0-cp35-win32

Everything was installed using "pip install file_name.whl" without error messages. However, the difference open cv will not be imported, and I get the following error:

>>> import cv2 Traceback (most recent call last): File "<input>", line 1, in <module> File "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 4.5.4\helpers\pydev\pydev_import_hook.py", line 21, in do_import module = self._system_import(name, *args, **kwargs) ImportError: DLL load failed: The specified module could not be found. 

cv2.cp35-win32.pyd plus many .dll files installed on C: \ Python35 \ Lib \ site-packages

I tried renaming cv2.cp35-win32.pyd to cv2.pyd and copy the .dll files to C: \ Python35 \ DLL,

I tried using another oprentv python package downloaded from the site, adding the bin directory to my PATH environment and moving the cv2.pyd file to C: \ Python35 \ Lib \ site packages

The same error appears every time. Any help would be appreciated!

Answer 1

In my situation, when using Pycharm to import cv2, it returned ImportError: DLL not found . However, using the python int intrereter to import, I got * ImportError: ... not a win32 DLL ... * . So, in this situation, I had to download the Visual C ++ 2015 redistribution package and solve the problem.

Therefore, to everyone who encounters the same error, make sure that you have the VC ++ redistribution package that was used to compile the modularized DLL.

Answer 2

I had a bug with Python 3.4 and opencv-python 3.3 on Windows 10. In my case, the problem was with my Anaconda distribution. I solved this with a solution from the opencv-python project page which points to this github .

The problem is the absence of python3.dll in the anaconda distribution. You can download the python binaries here and extract the dll from the zip archive. Put it in a folder in your PATH (e.g. C: \ Users \ MyName \ Anaconda3) and the import should work.

Answer 3

This worked for me:

pip install opencv-contrib-python

(Running Python 3.6.3 - 32bit, on Windows 7 - 64 bit)

Answer 4

So, I have a job, completely uninstalling everything and from the very beginning with Python 2.7.10.

It just doesn’t work with Python 3. For clarity, in what I did, I followed these two videos in the order in which I place them:

How to install opencv + dependencies

How to set up a path variable

Answer 5

I solved this by adding the path to the opencv dll into the PATH environment variable

You can follow this guide on how to add the path to an environment variable.

Answer 6

I managed to solve the problem of removing all Visual C ++ redistributable packages before 2008, and then installing Visual C ++ redistributable packages for VS 2015. Explanation here: http://answers.opencv.org/question/74384/opencv-python -30-with-python-35-on-windows /