opencv 单通道合并为多通道

int main(){
    cv::Mat m1=(cv::Mat_<int>(,)<<,,,,,);
    cv::Mat m2=(cv::Mat_<int>(,)<<,,,,,);
    cv::Mat m3=(cv::Mat_<int>(,)<<,,,,,);

    cv::Mat inm[]={m1,m2,m3};
    cv::Mat outm;
    cv::merge(inm,,outm);  // 合并后行数和列数不变。each element of the output array will be a concatenation of the elements of
    // the input arrays, where elements of i-th input array are treated as mv[i].channels()-element vectors.
    std::cout<<outm<<std::endl;

    std::vector<cv::Mat> inm1;
    inm1.push_back(m1);
    inm1.push_back(m2);
    inm1.push_back(m3);
    cv::Mat outm1;
    cv::merge(inm1,outm1);
    std::cout<<outm1<<std::endl;
    std::cout<<"outm1.rows:"<<outm1.rows<<std::endl;
    std::cout<<outm1.rowRange(,)<<std::endl;
    std::cout<<"outm1.cols:"<<outm1.cols<<std::endl;
    std::cout<<outm1.colRange(,)<<std::endl;
    return ;
}

注意：使用merge函数合并后生成的新矩阵行数和列数与输入矩阵的相同。