Hi, please check this:

http://answers.opencv.org/question/6495/visual-studio-2012-and-rtlfreeheap-error/#6603

If you use old OpenCV 2.43, please skip over the part for OpenCV 2.44.

Good luck.

Hi, @Aristoi, are you using OpenCV 2.43 or OpenCV 2.44? I think maybe you are using the latest OpenCV 2.44, so you should change the file names in fourth step according to the file folder in OpenCV\build\x64\vc10\lib or OpenCV\build\x64\vc11\lib.

You mean after you rebuilding OpenCV, the codes still cannot work? @ccng

I think you can try to rebuild your OpenCV.

http://answers.opencv.org/question/6495/visual-studio-2012-and-rtlfreeheap-error/#6603

Before rebuilding OpenCV, I used your codes and I got the similar problem like this.

But after rebuilding OpenCV, all things will work well. The codes can work well.

Hi, I tried your code before rebuilding OpenCV by CMake. I got the same problem.

This is because OpenCV does not work well with Visual Studio 2012, you have to use CMake to rebuild OpenCV. After that the codes work well.

Please follow this tutorial, good luck.

http://answers.opencv.org/question/6495/visual-studio-2012-and-rtlfreeheap-error/#6603

Hi, @Daniil Osokin, first time I configure my OpenCV according to official tutorial. I used three days to do that, but always has something wrong. I mostly gave up, since the official tutorial is too complex which makes me so upset. So I try to figure it by myself according to other old tutorials online.

And actually if you use VS2010, it is not necessary to use CMake to rebuild OpenCV. Only VS2012 needs this process since OpenCV 2.43 does not work well with VS2012. If you don't rebuild it, many functions will have weird problems. For example, when you use "std::cout" on a "cv::Mat", it always fails.

I think people shouldn't spend their most time configuring OpenCV, they should spend their time on their project. So I try to write a tutorial to make things simple.

@syco_link, did you use CMake to rebuild OpenCV according to tutorial? It seems that you forgot to add "C:\OpenCV\install\bin" in "Environment Variables -> System variables -> Path".

Hi, @Nicola17, I really want to help you, but my computer does not have CUDA... So I cannot test it. Sorry about that. Hope you can find answer from other guys.

Hi, which compiler do you use?

Finally, I wrote my own function to get Back Projection. Hope it can help you who have same problem.

float ReadValueFromHist( const Mat& hist, const int x, const int y ) const
{
    int indexAlpha = int( mat.at< Vec4b >( x, y )[ 3 ] ) * bins / 256;
    return hist.at< float >( indexAlpha, 0 );
}

void CalcBackProj()
{
    backProj = Mat( mat.rows, mat.cols, CV_32FC1);
    for ( int i = 0; i < mat.rows; ++i )
    {
        for ( int j = 0; j < mat.cols; ++j )
        {
            backProj.at< float >( i, j ) = ReadValueFromHist( hist, i, j );
        }
    }
}

Hi, it used me a lot of time to make OpenCV 2.43 and VS2012 work well. And so many people have same problem. So I wrote a tutorial about how to use OpenCV 2.43 in Visual Studio 2012 to try to make things simple. Good luck to you. If you still have questions, I'm happy to answer them.

http://answers.opencv.org/question/6495/visual-studio-2012-and-rtlfreeheap-error/#6603

If you have CUDA, in CMake, before second time clicking Configure button, I think you need set some buttons into checked state. Because my computer doesn't have CUDA...so I'm not very sure how to set up them. Hope it can help you guys who has CUDA.

If you have CUDA, in CMake, before second time clicking Configure button, I think you need set some buttons into checked state. Since here I cannot add picture, so I added screenshot at the end of page. Because my computer doesn't have CUDA...so I'm not very sure how to set up them. Hope it can help you guys who has CUDA.

Hi, actually, it used me a lot of time to make all things work. So let me give you a simple tutorial.

Hi, your code works well on my computer. Since OpenCV 2.43 does not work well with Visual Studio 2012, you have to use CMake to rebuild OpenCV 2.43. Have you done it? If you don't know how to rebuild it, tell me.

Hi, I need to use calcBackProject and then display the exact number.

    for ( int i = 0; i < backProj.rows; ++i )
    {
        for ( int j = 0; j < backProj.cols; ++j )
        {
            cout << int(backProj.at< uchar >( i, j )) << " ";
        }
        cout << endl;
    }

But its max value is 255 because of "uchar". I tried to use

    Mat backProj( slid_.rows, slid_.cols, CV_64FC1 );

After using calcBackProject, display it

    cout << backProj.at< double >( i, j );

but it does not work.

I really need the exact numbers which are bigger than 255. I don't want to use normalize before. Can I make it by calcBackProject?

If I try to scale it down, can this Back Projection matrix includes decimal? Because I don't want that 0 exists in this matrix.

Thank you.