类matlab find函数

逻辑矩阵，找出元素1并记录其位置索引。

int main(int argc, char** argv)
{
    unsigned char acSrc[4][4] =
    {
        0, 1, 1, 0,
        1, 0, 0, 1,
        1, 0, 1, 1,
        1, 1, 0, 0,
    };
    printf("acSrc-data address:%p
", acSrc);

    Mat src(4, 4, CV_8UC1, acSrc);
    printf("src-data address:%p
", src.data);

    cout << src << endl;

    vector<int> vec_row;
    vector<int> vec_col;

    for (int j = 0; j < src.cols; ++j)    
    {
        for (int i = 0; i < src.rows; ++i)
        {
            if (1 == src.at<unsigned char>(i, j))
            {
                vec_row.push_back(i);
                vec_col.push_back(j);
            }
            //cout << src.at<int>(i, j) << endl;
        }
    }

    cout << "vec_row.size:" << vec_row.size() << endl;
    cout << "vec_col.size:" << vec_col.size() << endl;

    vector<int>::iterator iter_row = vec_row.begin();
    vector<int>::iterator iter_col = vec_col.begin();

    Mat m = Mat::zeros(4, 4, CV_8UC1); 
    cout << m << endl;

    for (; (iter_row != vec_row.end()) && (iter_col != vec_col.end()); ++iter_row, ++iter_col)
    {
        cout << *iter_row << ", " <<  *iter_col << endl; 
        
        m.at<uchar>(*iter_row, *iter_col) = 1;
    }

    cout << m << endl;

    return 0;
}