OpenCv中將Ma轉成二維數組

#include <iostream>  
#include <opencv2/core/core.hpp>  
#include <opencv2/highgui/highgui.hpp>  
//#include<opencv2/opencv.hpp>//如果要包含所有庫
 
using namespace cv;
 
void main()
{
    //這一段程序實現：圖像img -> ptr[][] -> 圖像img2 的傳遞過程，即圖像->二維數組->圖像
    int i = 0, j = 0;
    Mat img = imread("F:\\photoCollection\\flowergirl.png", 0);//讀取圖像img。0表示轉換爲灰度圖像讀入
    int row = img.rows;
    int col = img.cols;
    namedWindow("原圖");
    imshow("原圖", img);
 
    Mat img2 = Mat(row, col, CV_8UC1);//圖像img2：row*col大小
 
    uchar **ptr = (uchar **)malloc(row*sizeof(uchar *));//二維數組ptr[][]
    for (i = 0; i < row; i++)
        ptr[i] = (uchar *)malloc(col*sizeof(uchar));
 
    uchar *ptmp = NULL;//這是關鍵的指針！！
 
    for (i = 0; i < row; i++)
    {
        ptmp = img2.ptr<uchar>(i);//指針指向img2的第i行
        for (j = 0; j < col; j++)
        {
            ptr[i][j] = img.at<uchar>(i, j);//img的矩陣數據傳給二維數組ptr[][]
            ptmp[j] = ptr[i][j];//二維數組數據傳給img2的第i行第j列
        }
    }
    namedWindow("新圖");
    imshow("新圖", img2);
 
    // 等待100000 ms後窗口自動關閉    
    waitKey(100000);
}

轉載https://blog.csdn.net/qq_20585527/article/details/81632532