初识Opencv4.X----图像透视变换

//图像图像透视变换
#include <stdio.h>
#include <iostream>
#include <string>
#include <opencv2\opencv.hpp>
using namespace std;
using namespace cv;

int main()
{
    
    
	//图像的透视变换，需要3x3的旋转矩阵，总共9个参数，通过原图像和变换后的对应4个点就可以构造12个方程解出9个参数
	Mat img = imread("noobcvqr.png");
	//注意边界点不能用，图像为628*628，最大值为627，否则会报错
	Point2f src[4] = {
    
     Point2f(94,374),Point2f(507,380),Point2f(1,623) ,Point2f(627,627) };
	Point2f dst[4] = {
    
     Point2f(0,0),Point2f(627,0),Point2f(0,627) ,Point2f(627,627) };
	Mat rotation, img_dst;
	rotation = getPerspectiveTransform(src, dst);
	warpPerspective(img, img_dst, rotation, Size(img.cols, img.rows));
	namedWindow("原图", WINDOW_NORMAL);
	imshow("原图", img);
	namedWindow("透视变换", WINDOW_NORMAL);
	imshow("透视变换", img_dst);
	waitKey(0);
	return 0;
}