[OpenCV2.4]图像变换之透视变换
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#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
int
main(int argc, char *argv[])
{
cv::Mat src_img = cv::imread("../../image/lenna.png", 1);
if(src_img.empty()) return -1;cv::Point2f pts1[] ={cv::Point2f(150,150),cv::Point2f(150,300),cv::Point2f(350,300),cv::Point2f(350,150)};
cv::Point2f pts2[] ={cv::Point2f(200,150),cv::Point2f(200,300),cv::Point2f(340,270),cv::Point2f(340,180)};// 透视变换的行列计算
cv::Mat perspective_matrix = cv::getPerspectiveTransform(pts1, pts2);
cv::Mat dst_img;
// 变换
cv::warpPerspective(src_img, dst_img, perspective_matrix, src_img.size(), cv::INTER_LINEAR);// 变换前后方形显示
cv::line(src_img, pts1[0], pts1[1], cv::Scalar(255,255,0), 2, CV_AA);
cv::line(src_img, pts1[1], pts1[2], cv::Scalar(255,255,0), 2, CV_AA);
cv::line(src_img, pts1[2], pts1[3], cv::Scalar(255,255,0), 2, CV_AA);
cv::line(src_img, pts1[3], pts1[0], cv::Scalar(255,255,0), 2, CV_AA);
cv::line(src_img, pts2[0], pts2[1], cv::Scalar(255,0,255), 2, CV_AA);
cv::line(src_img, pts2[1], pts2[2], cv::Scalar(255,0,255), 2, CV_AA);
cv::line(src_img, pts2[2], pts2[3], cv::Scalar(255,0,255), 2, CV_AA);
cv::line(src_img, pts2[3], pts2[0], cv::Scalar(255,0,255), 2, CV_AA);cv::namedWindow("src", CV_WINDOW_AUTOSIZE|CV_WINDOW_FREERATIO);
cv::namedWindow("dst", CV_WINDOW_AUTOSIZE|CV_WINDOW_FREERATIO);
cv::imshow("src", src_img);
cv::imshow("dst", dst_img);
cv::waitKey(0);
}
输入图像：
http://zwmin.com/wp-content/uploads/2012/08/wpid-7bf664a6b70a177724066f8bd960ffd5_10229140.jpg
输出结果：
http://zwmin.com/wp-content/uploads/2012/08/wpid-7bf664a6b70a177724066f8bd960ffd5_10250515.jpg
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