OpenCVの：複合チャネルを分離します

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char** argv)
{
    Mat src = imread("f:/temp/images/lena.jpg");
    if (src.empty())
    {
        printf("Could not find the image!\n");
        return -1;
    }

    namedWindow("input", WINDOW_AUTOSIZE);
    imshow("input", src);

    vector<Mat> mv;
    // 通道分离
    split(src, mv);
    int size = mv.size();
    printf("number of channels: %d\n", size);
    imshow("blue channel", mv[0]);
    imshow("green channel", mv[1]);
    imshow("red channel", mv[2]);

    // 修改通道内容然后合并通道
    mv[2] = Scalar(0);
    // bitwise_not(mv[0], mv[0]);
    Mat dst;
    // 通道合并
    merge(mv, dst);
    imshow("merge dst", dst);

    waitKey(0);
    destroyAllWindows();
}