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

using namespace std;
using namespace cv;

void main()
{
    Mat Scr1 = imread("K:\\test.png");
    Mat Scr2 = imread("K:\\test.png");
    Mat Scr3 = imread("K:\\test.png");
    if (Scr1.empty())
    {
        return;
    }
    imshow("原始图像", Scr1);
    //OpenCV中通道的顺序是BGR
    int Row = Scr1.rows;            //获取行数目
    int Col = Scr1.cols;            //获取列数目
    int Channel = Scr1.channels();  //获取通道数目

    //指针的访问
    for (int i = 0; i < Row; i++)
    {
        for (int j = 0; j < Col; j++)
        {
            Scr1.ptr<Vec3b>(i)[j][0] = 0;
        }
    }
    imshow("蓝色通道置零", Scr1);
    //迭代器访问，访问的是每一个像素点
    Mat_<Vec3b>::iterator it = Scr2.begin<Vec3b>();
    while (it != Scr2.end<Vec3b>())
    {
        //(*it)[0] = 0;//蓝色通道置零；
        (*it)[1] = 0;//绿色通道置零；
        //(*it)[2] = 0;//红色通道置零；
        it++;
    }
    imshow("绿色通道置零", Scr2);

    //动态访问，访问的是每一个像素点，最慢也是最直接易理解的访问方式
    for (int i = 0; i < Row; i++)
    {
        for (int j = 0; j < Col; j++)
        {
            Scr3.at<Vec3b>(i, j)[2] = 0;
        }
    }

    imshow("红色通道置零", Scr3);
    waitKey(0);
    system("pause");
    return;
}