Problem in load library when using opencv and matlab

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chitra 2012-2-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/28056-problem-in-load-library-when-using-opencv-and-matlab

评论： Zaigham Bajwa 2018-12-10

http://blog.cordiner.net/2010/02/15/opencv-viola-jones-object-detection-in-matlab/ describes how to use OpenCv with matlab. I tried to execute the following command given at the end of the page :

 opencvPath = 'C:\Program Files (x86)\OpenCV1.1';
    includePath = fullfile(opencvPath, 'cxcore\include');
loadlibrary(...
  fullfile(opencvPath, 'bin\cxcore110.dll'), ...
  fullfile(opencvPath, 'cxcore\include\cxcore.h'), ...
    'mfilename', 'proto_cxcore');
loadlibrary(...
  fullfile(opencvPath, 'bin\cv110.dll'), ...
  fullfile(opencvPath, 'cv\include\cv.h'), ...
    'alias', 'cv110', 'includepath', includePath);
loadlibrary(...
  fullfile(opencvPath, 'bin\highgui110.dll'), ...
  fullfile(opencvPath, 'otherlibs\highgui\highgui.h'), ...
    'alias', 'highgui110', 'includepath', includePath);
classifierFilename = 'C:/Program Files (x86)/OpenCV1.1/data/haarcascades/haarcascade_frontalface_alt.xml';
cvCascade = calllib('cv110', 'cvLoadHaarClassifierCascade', classifierFilename, ...
  libstruct('CvSize',struct('width',int16(100),'height',int16(100))));

However,it returns an error ??? Error using ==> loadlibrary at 279 Microsoft Visual C++ 2005 or 2008 is required to use this feature.

Error in ==> opencv_test_prototype at 4
loadlibrary(...

I have Visual Studio 2010 Express as well as 2008 installed and have worked with MEX files before. I dont know how to proceed. Kindly help

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Answer 1

Kaustubha Govind 2012-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/28056-problem-in-load-library-when-using-opencv-and-matlab#answer_36477

See if this previous discussion helps: http://www.mathworks.it/matlabcentral/answers/27971-loadlibrary-error

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chitra 2012-2-8

Hi Kaustubha,I did what you said but its the same thing,same load library error.I have 2010 also and I performed mex -setup and it showed Please choose your compiler for building external interface (MEX) files:

Would you like mex to locate installed compilers [y]/n? y

Select a compiler:

[1] Microsoft Visual C++ 2010 Express in c:\Program Files (x86)\Microsoft Visual Studio 10.0

[2] Microsoft Visual C++ 2008 SP1 in C:\Program Files (x86)\Microsoft Visual Studio 9.0

[0] None

Compiler: 2,

Now on selecting 2 it shows Error: Could not find the 64-bit compiler. This may indicate that the

"X64 Compilers and Tools" or the Microsoft Windows Software

Development Kit (SDK) is not installed. To build 64-bit MEX-files

Microsoft Visual C++ 2008 requires that these two packages are

installed properly.

*****************************************************************************

Trying to update options file: C:\Users\Sumona\AppData\Roaming\MathWorks\MATLAB\R2010b\mexopts.bat

From template: C:\PROGRA~1\MATLAB\R2010b\bin\win64\mexopts\msvc90opts.bat

Done . . .

But load library error repeats and it mentions that I must have 2008. Now I selected second time VS2010 but the error remains. So, do I have to install those missing Microsoft Windows Software

Development Kit (SDK) although my system has SDK7.1. Please explain what to do.Thanx

chitra 2012-2-8

Hi Kaustubha and Walter: I followed all the steps described in link http://www.mathworks.com/support/solutions/en/data/1-6IJJ3L/?solution=1-6IJJ3L . Now in mex setup there is no error(the prev err Could not find 64 bit compiler etc vanished). However,the load library error remains! What else is left to do now?

Kaustubha Govind 2012-2-9

Chitra - you mentioned in your previous comment that you are using R2011a, but from the output of your "mex -setup" it shows that you are using R2010b, which is older than R2011a. The previous discussion I pointed to in my original answer is applicable to you.

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Answer 2

Zaigham Bajwa 2018-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/28056-problem-in-load-library-when-using-opencv-and-matlab#answer_351417

Failed to find OpenCV libraries in C:\opencv\build\x64\mingw\lib

Dont know what the error is ?

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Walter Roberson 2018-12-10

Where did you install OpenCV ?

Zaigham Bajwa 2018-12-10

C:\opencv

This is the location

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Problem in load library when using opencv and matlab

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