Invalid MEX-file

[Eder01]

Sorry to set up this issue again, but the solution from ( Invalid Mex file. #58 ) is not working for me...

I followed the steps shown in Surya's youtube tutorial and get everything so far. After running "mexopencv.make" without any errors, and adding the path AND restarting matlab, i try to start the facedetect example (also other examples, or even cv.help) running but matlab gets always an error. For the facedetect example:

Invalid MEX-file 'C:\Program Files\opencv\mexopencv-master+cv\private\CascadeClassifier_.mexw64': Das angegebene Modul wurde nicht gefunden.

(in english: specified module could not be found)

If i look into the given path i CAN find the CascadeClassifier_.mexw64 file...

I am using: MATLAB R2012b (x64), Visual Studio 2010 Express (x64) with Microsoft Software Development Kit (SDK) 7.1 as compiler, openCV 2.4.9.

In the path "C:\Program Files\opencv" there is my opencv folder with build\x64\vc10 subfolders and the sources subfolder. AND there is also my mexopencv-master folder with +cv and +mexopencv subfolder.

I changed the paths in the make.m file:

    %I_path = fullfile(opts.opencv_path,'include');
    %L_path = fullfile(opts.opencv_path,arch_str(),compiler_str(),'lib');
    I_path = 'C:\Program Files\opencv\opencv\build\include';
    L_path = 'C:\Program Files\opencv\opencv\build\x64\vc10\lib';
   %opts.opencv_path = 'C:\opencv';  % OpenCV location
    opts.opencv_path = 'C:\Program Files\opencv\opencv';

I also tried to edit the mexopts regarding the secure-flag which is originally set to D_SECURE_SCL=0 without any effect.

Many thanks. Greetings,
Philip

[amroamroamro]

you also need to add the folder with the OpenCV DLL files to the system's PATH environment variable (that would be C:\Program Files\opencv\opencv\build\x64\vc10\bin in your case).

You could do this from inside MATLAB, but the change will only last for the current session:

>> setenv('PATH', ['C:\Program Files\opencv\opencv\build\x64\vc10\bin' pathsep() getenv('PATH')])

BTW you didn't have to manually edit the make.m file, you could have just set the opencv_path option on call, as in:

>> mexopencv.make('opencv_path','C:\Program Files\opencv\opencv\build')

And there is no need to change _SECURE_SCL (that was only needed for old VS2008)

[Eder01]

Oh my god, that was easy! Always just added the opencv dll files to the matlab path and not to the system path...

Im really really gratefull!
Thaaaaaaaaaaaanks

[brianbaloch]

i am using BCILAB on MATLAB 2015b. I am getting an error regarding Mex File. please help me. I don't know about Mex file. I am very new to these things. please help me and tell me step by step

[amroamroamro]

@brianbaloch this is not the place to ask random MATLAB questions! Please keep it related to issues regarding mexopencv...