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Asked: 2026-05-20T06:18:29+00:00

I have just installed OpenCV on my Windows 7 machine. As a result, I

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I have just installed OpenCV on my Windows 7 machine. As a result, I get a new directory:

C:\OpenCV2.2\Python2.7\Lib\site-packages

In this directory, I have two files: cv.lib and cv.pyd.

Then I try to use the opencv from Python. I do the following:

import sys
sys.path.append('C:\OpenCV2.2\Python2.7\Lib\site-packages')
import cv

As a result I get the following error message:

File "<stdin>", line 1, in <module>
ImportError: DLL load failed: The specified module could not be found.

What am I doing wrong?

ADDED

As it was recommended here, I have copied content of C:\OpenCV2.0\Python2.6\Lib\site-packages to the C:\Python26\Lib\site-packages. It did not help.

ADDED 2

My environment variables have the following values:

Path=C:\Program Files\MiKTex\miktex\bin;C:\OpenCV2.2\bin;C:\Python26;
PYTHONPATH=C:\OpenCV2.2\Python2.7\Lib\site-packages

Do I need to change something? Do I need to add something?

ADDED 3

I think my question is general: How to use a library? Probably I need to find a *.ddl file somewhere? Then I need to use the name of the directory containing this file as a value to some environment variables? Or maybe I need to use sys.addpath? I also need to know how the way to call the library is related to the name of the file that contains the library.

ADDED 4

It is interesting that when I type import cv, I get:

ImportError: DLL load failed: The specified module could not be found.

But when I type import opencv I get:

ImportError: No module named opencv

ADDED 5

It has been suggested that I usthe e inconsistent version of python. In more details, OpenCV tries to use Python2.7 and I had Python2.6. So, I have installed Python 2.7. It makes difference. Now I do not have the old error message, but I have a new one:

ImportError: numpy.core.multiarray failed to import
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: numpy.core.multiarray failed to import

ADDED 6

I have managed to resolve the problem by installing numpy. It took some time because I did not realized that there are different numpy installer corresponding to different versions of Python. Some details can be found in my answer to my own question (see bellow).

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1 Answer

  1. Editorial Team

    The problem was resolved. The following steps has been done:

    1. A new version of python (version 2.7) has been installed.
    2. After that I still was unable to run OpenCV because I had some problems with the numpy library.
    3. I tired to install numpy but the installer did not see my new version of the Python.
    4. I deleted the old version of Python as well as links to the old version in the Path system vatriable.
    5. After that numpy installer was not able to finish the installation.
    6. I have realized that I need to run another numpy installer that is associated with the Python 2.7. It can be found here.
    7. Finally everything worked. I was able to “import cv”.
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