I have just installed OpenCV on my Windows 7 machine. As a result, I get a new directory:
In this directory, I have two files:
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?
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.
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?
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.
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
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
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).
The problem was resolved. The following steps has been done:
I suspect you have the same problem I've run into. If you have a 64-bit version of Python, it cannot load 32-bit DLLs. OpenCV currently only ships 32-bit binaries. If you want 64-bit .pyd and .dll files, you have to compile them yourself. There are some instructions on the OpenCV Wiki, but it's not for the faint of heart. Expect to have a substantial time investment.
The easiest solution is to:
The PythonXY distribution includes pyopencv -- a good set of OpenCV hooks. The only limitation is that it's 32-bit, so don't make plans to process gigapixel astronomy data with it! ;)
If you must have the 64-bit version, follow these instructions to get it OpenCV to compile with Visual Studio 2010. There's a discussion on stackoverflow that describes building 64-bit apps with VC Express.
EDIT: OpenCV now ships with 64-bit Python binaries. The .dll files need to go somewhere in your path (I put them in the scripts folder), and the .pyd files go in your site-packages directory.