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[OpenCV2.4]图像变换之透视变换

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发表于 2012-8-8 17:31:30 | 显示全部楼层 |阅读模式

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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:


输出结果:

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