OpenCV 中的split函数和merge函数 及示例_opencv split_zqx951102的博客-CSDN博客

#include <QApplication>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
#include <QDebug>
using namespace cv;
using namespace std;

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    string path="D:\\Qt\\Qt5Book\\Qt5.14\\opencv\\try1\\widget\\5.png";

    Mat img = imread(path);//创建图像

    vector<Mat> channels;
    split(img,channels);//BGR三个通道分离

    vector<Mat> mbgr(3);
    Mat bk1(img.size(),CV_8UC1,Scalar(0));

    //CV_8UC1:CV_+(位数)+(数据类型)+(通道数)

    //这里是8位+unsigned char型+1个通道

    Mat imageB(img.size(),CV_8UC3);

    //8位+unsigned char型+3个通道    

/*
    mbgr[0]=channels[0];
    mbgr[1]=bk1;
    mbgr[2]=bk1;
*/

//蓝色通道

/*
    mbgr[0]=bk1;
    mbgr[1]=channels[1];
    mbgr[2]=bk1;
*/

//绿色通道

/*
    mbgr[0]=bk1;
    mbgr[1]=bk1;
    mbgr[2]=channels[2];
*/

//红色通道

    mbgr[0]=channels[0];
    mbgr[1]=channels[1];
    mbgr[2]=channels[2];

    merge(mbgr,imageB);

//这里把3个通道进行了合并。
    imshow("imageB",imageB);

    return a.exec();
}