OpenCV文件存储错误(OpenCV filestorage error)

 您好，我想将3个直方图（rgb）导出到.xml文件，然后从.xml读取并保存到另一个矩阵。 
 
 码： 
 
int main(int argc, char** argv)
{
    Mat org,cmp, dst;

    /// Load image
    org = imread("arrowr.png");
    cmp = imread("cat.jpg");

    if (!org.data)
    {
        return -1;
    }
    /// Separate the image in 3 places ( B, G and R )
    Mat bgr_planes_org[3] = {};         //zmena z vector<Mat> bgr_planes;
    split(org, bgr_planes_org);

    /// Establish the number of bins
    int histSize = 256;

    /// Set the ranges ( for B,G,R) )
    float range[] = { 0, 256 };
    const float* histRange = { range };

    bool uniform = true; bool accumulate = false;

    Mat b_hist_org, g_hist_org, r_hist_org;


    /// Compute the histograms:
    calcHist(&bgr_planes_org[0], 1, 0, Mat(), b_hist_org, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes_org[1], 1, 0, Mat(), g_hist_org, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes_org[2], 1, 0, Mat(), r_hist_org, 1, &histSize, &histRange, uniform, accumulate);

    // Draw the histograms for B, G and R
    int hist_w = 512; int hist_h = 400;
    int bin_w = cvRound((double)hist_w / histSize);

    Mat histImage(hist_h, hist_w, CV_8UC3, Scalar(0, 0, 0));

    /// Normalize the result to [ 0, histImage.rows ]
    normalize(b_hist_org, b_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());
    normalize(g_hist_org, g_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());
    normalize(r_hist_org, r_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());

    Mat mat_r, mat_g, mat_b;
    string filename = "test.xml";
    FileStorage fs(filename, FileStorage::WRITE);
    fs << "blu" << b_hist_org;
    fs << "grn" << g_hist_org;
    fs << "red" << r_hist_org;
    fs.release();

    FileStorage fs(filename, FileStorage::READ);
    fs["blu"] >> mat_b;
    fs["red"] >> mat_r;
    fs["grn"] >> mat_g;
    fs.release();

        cout << mat_r << endl;
        cout << mat_g << endl;
        cout << mat_b << endl;

        system("pause");

    return 0;
}
 
 当我尝试运行它时，它将引发此“ConsoleApplication2.exe中0x00007FF96ECA8A5C处的未处理异常：Microsoft C ++异常：内存位置0x000000A4D911BF40处的cv :: Exception”。 
 
 我认为它与FileStorage::READ 。 当我评论我从.xml读取的部分时，它的工作原理没有错误。 当我只放入一个矩阵然后读取它时，它也可以工作。 
 
 我还注意到，在.xml文件中，我有这样的导出数据： 
 
<blu type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"blue matrix data"
</data></blu>
<blu>grn</blu>
<blu type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"green matrix data"    
</data></blu>
<red type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"red matrix data"
</data></red>
</opencv_storage>
 
 为什么会有这个<blu>grn</blu> ？ 我想要我的绿色矩阵与头<grn> 。 为什么在<blu>标题下的grn ？ 
 
 根据openCV我应该有三个标题为每个矩阵。 http://docs.opencv.org/2.4/doc/tutorials/core/file_input_output_with_xml_yml/file_input_output_with_xml_yml.html 
 
 任何对解决方案的帮助/链接都很酷。 

Hello I would like to export 3 histograms (rgb) to a .xml file then read from .xml and save to another matrix. 
 
Code: 
 
int main(int argc, char** argv)
{
    Mat org,cmp, dst;

    /// Load image
    org = imread("arrowr.png");
    cmp = imread("cat.jpg");

    if (!org.data)
    {
        return -1;
    }
    /// Separate the image in 3 places ( B, G and R )
    Mat bgr_planes_org[3] = {};         //zmena z vector<Mat> bgr_planes;
    split(org, bgr_planes_org);

    /// Establish the number of bins
    int histSize = 256;

    /// Set the ranges ( for B,G,R) )
    float range[] = { 0, 256 };
    const float* histRange = { range };

    bool uniform = true; bool accumulate = false;

    Mat b_hist_org, g_hist_org, r_hist_org;


    /// Compute the histograms:
    calcHist(&bgr_planes_org[0], 1, 0, Mat(), b_hist_org, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes_org[1], 1, 0, Mat(), g_hist_org, 1, &histSize, &histRange, uniform, accumulate);
    calcHist(&bgr_planes_org[2], 1, 0, Mat(), r_hist_org, 1, &histSize, &histRange, uniform, accumulate);

    // Draw the histograms for B, G and R
    int hist_w = 512; int hist_h = 400;
    int bin_w = cvRound((double)hist_w / histSize);

    Mat histImage(hist_h, hist_w, CV_8UC3, Scalar(0, 0, 0));

    /// Normalize the result to [ 0, histImage.rows ]
    normalize(b_hist_org, b_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());
    normalize(g_hist_org, g_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());
    normalize(r_hist_org, r_hist_org, 0, histImage.rows, NORM_MINMAX, -1, Mat());

    Mat mat_r, mat_g, mat_b;
    string filename = "test.xml";
    FileStorage fs(filename, FileStorage::WRITE);
    fs << "blu" << b_hist_org;
    fs << "grn" << g_hist_org;
    fs << "red" << r_hist_org;
    fs.release();

    FileStorage fs(filename, FileStorage::READ);
    fs["blu"] >> mat_b;
    fs["red"] >> mat_r;
    fs["grn"] >> mat_g;
    fs.release();

        cout << mat_r << endl;
        cout << mat_g << endl;
        cout << mat_b << endl;

        system("pause");

    return 0;
}
 
When I try to run it it throws me this "Unhandled exception at 0x00007FF96ECA8A5C in ConsoleApplication2.exe: Microsoft C++ exception: cv::Exception at memory location 0x000000A4D911BF40."
 
I think its something with FileStorage::READ. When i comment the section where i read from .xml it works without error. It also works when i put only one matrix in and then read it .
 
I also noticed that in the .xml file i have the exported data like this:
 
<blu type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"blue matrix data"
</data></blu>
<blu>grn</blu>
<blu type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"green matrix data"    
</data></blu>
<red type_id="opencv-matrix">
<rows>256</rows>
<cols>1</cols>
<dt>f</dt>
<data>
"red matrix data"
</data></red>
</opencv_storage>
 
Why is there this <blu>grn</blu>? I want my green matrix with the header <grn>. Why is the grn under the <blu> header?
 
According to openCV i should have three headers for each matrix. http://docs.opencv.org/2.4/doc/tutorials/core/file_input_output_with_xml_yml/file_input_output_with_xml_yml.html
 
Any help/link to solution would be cool.

原文：https://stackoverflow.com/questions/36339509