Question

有没有办法将opencv对象保存到数据库（如oracle，mysql a.s.o）而不是xml文件？

CvSave就像一个黑盒子。

Answer 1

你的问题很好。保存到XML需要更多的光盘空间并加载更慢。我自己遇到了问题并编写了一个简短的代码，将Mat保存到光盘，你改变它来保存其他对象。

// Save matrix to binary file
int saveMat( const string& filename, const Mat& M){
    if (M.empty()){
       return 0;
    }
    ofstream out(filename.c_str(), ios::out|ios::binary);
    if (!out)
       return 0;

    int cols = M.cols;
    int rows = M.rows;
    int chan = M.channels();
    int eSiz = (M.dataend-M.datastart)/(cols*rows*chan);

    // Write header
    out.write((char*)&cols,sizeof(cols));
    out.write((char*)&rows,sizeof(rows));
    out.write((char*)&chan,sizeof(chan));
    out.write((char*)&eSiz,sizeof(eSiz));

    // Write data.
    if (M.isContinuous()){
       out.write((char *)M.data,cols*rows*chan*eSiz);
    }
    else{
       return 0;
    }
    out.close();
    return 1;
}

/****************************************************************************/
// Read matrix from binary file
int readMat( const string& filename, Mat& M){
    ifstream in(filename.c_str(), ios::in|ios::binary);
    if (!in){
       M = NULL_MATRIX;
       return 0;
    }
    int cols;
    int rows;
    int chan;
    int eSiz;

    // Read header
    in.read((char*)&cols,sizeof(cols));
    in.read((char*)&rows,sizeof(rows));
    in.read((char*)&chan,sizeof(chan));
    in.read((char*)&eSiz,sizeof(eSiz));

    // Determine type of the matrix 
    int type = 0;
    switch (eSiz){
    case sizeof(char):
         type = CV_8UC(chan);
         break;
    case sizeof(float):
         type = CV_32FC(chan);
         break;
    case sizeof(double):
         type = CV_64FC(chan);
         break;
    }

    // Alocate Matrix.
    M = Mat(rows,cols,type,Scalar(1));  

    // Read data.
    if (M.isContinuous()){
       in.read((char *)M.data,cols*rows*chan*eSiz);
    }
    else{
       return 0;
    }
    in.close();
    return 1;
}

Opencv存储到数据库

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