1. 图像信息获取

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// 获取图像信息

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

using namespace cv;
using namespace std;

int main(){
    Mat img = imread("/home/v/home.png");
    if(img.empty()){
        cout<<"Error: Could not load image."<<endl;
        return -1;
    }

    imshow("img",img);

    cout<<"img row: "<<img.rows<<endl;
    cout<<"img col: "<<img.cols<<endl;
    cout<<"img ch: "<<img.channels()<<endl;

    waitKey(0);
    return 0;
}

2. 图像ROI

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// 获取图像信息

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

using namespace cv;
using namespace std;

int main(){
    Mat img = imread("/home/v/home.png");
    if(img.empty()){
        cout<<"Error: Could not load image."<<endl;
        return -1;
    }

    imshow("img",img);

    // 图像信息
    cout<<"img row: "<<img.rows<<endl;
    cout<<"img col: "<<img.cols<<endl;
    cout<<"img ch: "<<img.channels()<<endl;

    // 图像roi
    Mat imageROI(img, Rect(100,100,200,150));
    imshow("imageROI",imageROI);
    waitKey(0);
    return 0;
}