#include <iostream>
#include "highgui.h"
#include "opencv2/imgproc/imgproc.hpp"
int main()
{
// get original image.
cv::Mat originalImage = cv::imread("road.png");
// perspective image.
cv::Mat perspectiveImage;
// perspective transform
cv::Point2f objectivePoints[4], imagePoints[4];
// original image points.
imagePoints[0].x = 10.0; imagePoints[0].y = 457.0;
imagePoints[1].x = 395.0; imagePoints[1].y = 291.0;
imagePoints[2].x = 624.0; imagePoints[2].y = 291.0;
imagePoints[3].x = 1000.0; imagePoints[3].y = 457.0;
// objective points of perspective image.
// move up the perspective image : objectivePoints.y - value .
// move left the perspective image : objectivePoints.x - value.
double moveValueX = 0.0;
double moveValueY = 0.0;
objectivePoints[0].x = 46.0 + moveValueX; objectivePoints[0].y = 920.0 + moveValueY;
objectivePoints[1].x = 46.0 + moveValueX; objectivePoints[1].y = 100.0 + moveValueY;
objectivePoints[2].x = 600.0 + moveValueX; objectivePoints[2].y = 100.0 + moveValueY;
objectivePoints[3].x = 600.0 + moveValueX; objectivePoints[3].y = 920.0 + moveValueY;
cv::Mat transform = cv::getPerspectiveTransform(objectivePoints, imagePoints);
// perspective.
cv::warpPerspective(originalImage,
perspectiveImage,
transform,
cv::Size(originalImage.rows, originalImage.cols),
cv::INTER_LINEAR | cv::WARP_INVERSE_MAP);
// cv::imshow("perspective image", perspectiveImage);
// cvWaitKey(0);
cv::imwrite("perspectiveImage.png", perspectiveImage);
return 0;
}
