opencv学习笔记五十：透视变换综合实例

案例背景：对下面发生畸变的图像进行校正

 方案思路：灰度二值化分割，闭操作，寻找轮廓，霍夫直线检测，直线排序，直线方程，直线交点，透视矩阵，透视变换。

#include<opencv2\opencv.hpp>
using namespace cv;
using namespace std;
int main(int arc, char** argv) { 
	Mat src = imread("1.jpg");
	namedWindow("input", CV_WINDOW_AUTOSIZE);
	imshow("input", src);
	//灰度化
	Mat grayImg;
	cvtColor(src, grayImg, CV_BGR2GRAY);

	//二值化
	Mat binaryImg;
	threshold(grayImg, binaryImg, 0, 255, THRESH_BINARY_INV | THRESH_OTSU);

	//闭操作
	Mat kernel = getStructuringElement(MORPH_RECT,Size(3,3));
	morphologyEx(binaryImg, binaryImg, MORPH_CLOSE,kernel,Point(-1,-1) ,3);
	imshow("output", binaryImg);

	//寻找轮廓
	Mat