Opencv Mat操作大全

#include<opencv2/opencv.hpp>
#include<iostream>
using namespace std;
using namespace cv;
int main()
{
    float array[]={1,2,3};
    float array1[]={2,3,1};
    //用數組初始化Mat
    Mat mat=Mat(1,3,CV_32F,array);
    Mat mat1=Mat(1,3,CV_32F,array1);
    Mat tempmat;
    //對mat拷貝
    mat.copyTo(tempmat);
    cout<<tempmat<<endl;
    //選擇roi,rect的四個參數分別是(x,y)座標，第三個參數是寬度，第四個參數是高度
    Mat roi(mat,Rect(0,0,2,1));
    cout<<roi<<endl;
    //mat-mat1的1範數
    cout<<norm(mat,mat1,CV_L1)<<endl;
    //mat-mat1的2範數
    cout<<norm(mat,mat1,CV_L2)<<endl;
    //打印mat的內容
    cout<<mat<<endl;
    //創建對角爲1的矩陣
    Mat eyemat=Mat::eye(4,4,CV_8U);
    cout<<eyemat<<endl;
    //提取eyemat的1-2行，3-4列
    Mat submat=eyemat(Range(0,2),Range(2,4));
    cout<<submat<<endl;
    //abs(),max(),min(),+,-，*，/等操作很簡單，就不寫了
    float a[2][2]={2,3,1,2};
    float b[2][2]={2,1,0,-1};
    Mat amat(2,2,CV_32F,a);
    Mat bmat(2,2,CV_32F,b);
    cout<<amat<<endl;
    cout<<bmat<<endl;
    //求amat的逆
    cout<<amat.inv()<<endl;
    //兩矩陣相乘
    cout<<amat.mul(bmat)<<endl;
    //生成一個值爲0的矩陣
    cout<<Mat::zeros(3,3,CV_32F)<<endl;
    //生成一個值爲1的矩陣
    cout<<Mat::ones(3,3,CV_32F)<<endl;
    system("pause");
}

#include<opencv2/opencv.hpp>
#include<assert.h>
using namespace cv;
int main()
{
    Mat srcImage=imread("f:/huangshan.jpg");
    Mat dstImage=imread("f:/Lena.jpg");
    assert(srcImage.data!=NULL && dstImage.data!=NULL);

    Mat roi=srcImage(Rect(0,0,dstImage.cols,dstImage.rows)); //獲取感興趣區域
    Mat mask = imread("f:/Lena.jpg",0);
    namedWindow("image",WINDOW_AUTOSIZE);
    roi=roi.t(); //mat轉置
    flip(roi,roi,0); //0爲上下翻轉，>0爲左右翻轉，<0同時上下左右翻轉
    //將掩膜拷貝到ROI中
    //dstImage.copyTo(roi,mask);
    addWeighted(roi,0.7,dstImage,0.3,0.,roi);


    //Mat mask = imread("f:/huangshan.jpg",0);
    //img.copyTo(roi,mask);
    imshow("image",srcImage);
    waitKey();
    return 0;
}