OpenCV的矩阵合并方法

Mat mergeRows(Mat& A, Mat& B)
{
    CV_ASSERT(A.cols == B.cols&&A.type() == B.type());
    int totalRows = A.rows + B.rows;

    Mat mergedDescriptors(totalRows, A.cols, A.type());
    Mat submat = mergedDescriptors.rowRange(0, A.rows);
    A.copyTo(submat);
    submat = mergedDescriptors.rowRange(A.rows, totalRows);
    B.copyTo(submat);
    return mergedDescriptors;
}