OpenCV——重映射、仿射变换

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

using namespace cv;
using namespace std;


int main(int argc, char** argv)
{
    Mat src,dst;
    Mat map_x, map_y;
    src = imread("3 input.bmp");

    imshow("原图像", src);

    //创建和原图一样的效果图，x重映射图，y重映射图
    dst.create(src.size(), src.type());
    map_x.create(src.size(), CV_32FC1);
    map_y.create(src.size(), CV_32FC1);

    //遍历所有像素点，改变map_x & map_y的值
    for (int j = 0; j < src.rows; j++)
    {
        for (int i = 0; i < src.cols; i++)
        {
            map_x.at<float>(j, i) = static_cast<float>(i);
            map_y.at<float>(j, i) = static_cast<float>(src.rows - j);
        }
    }

    //进行重映射操作
    remap(src, dst, map_x, map_y, INTER_LINEAR);

    imshow("效果图", dst);
    
    waitKey(0);
    return 0;

}