Cannot import any contrib modules in Python

asked 2016-08-10 08:50:22 -0600

n.jmurov gravatar image

I'm trying to build OpenCV on my desktop with contrib modules after having successfully built it on my laptop. As far as I can tell, all the .dll's for the contrib modules get generated and in general, I cannot find any differences in the file structure on both machines. Yet on the desktop, I cannot import any contrib modules and when I run cv2.getBuildInformation, the contrib modules are not in the list of modules to be built.

OpenCV 3.1.0, Windows 7, Python 2.7.11

Thank you.

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can you show us the cmake output ? (append to your question)

berak gravatar imageberak ( 2016-08-10 09:17:12 -0600 )edit

Sorry for a silly question - which file would contain CMake output? I used CMake GUI.

n.jmurov gravatar imagen.jmurov ( 2016-08-10 09:56:24 -0600 )edit

it's the same as cv2.getBuildInformation()

any cjhance there is an older cv2 installed ? did you build the INSTALL project after building opencv ?

berak gravatar imageberak ( 2016-08-10 09:58:42 -0600 )edit
1

It looks like it was indeed picking up cv2.pyd that was left from a previous installation (without contrib modules). What should I do now? I've tried replacing the old cv2.pyd with the new one but now I'm getting 'DLL load failed'.

n.jmurov gravatar imagen.jmurov ( 2016-08-10 10:31:05 -0600 )edit
1

"but now I'm getting 'DLL load failed'."

so you built opencv with dynamic libs. either:

  • put the folder with the opencv dlls on the PATH
  • or rebuild with cmake -DBUILD_SHARED_LIBS=OFF to get a statically linked cv2.pyd, which is independant of other opencv dlls.
berak gravatar imageberak ( 2016-08-10 10:43:36 -0600 )edit

"the folder with the opencv dlls on the PATH" - They are on the PATH already.

n.jmurov gravatar imagen.jmurov ( 2016-08-10 10:53:35 -0600 )edit
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double check, if it's the correct PATH, and again, - static linking is the recommended way for python / java wrappers.

berak gravatar imageberak ( 2016-08-10 10:56:12 -0600 )edit

OK thanks - I didn't know about static linking. I don't believe I saw it mentioned in any of OpenCV installation tutorials.

n.jmurov gravatar imagen.jmurov ( 2016-08-10 11:04:51 -0600 )edit
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