[OpenCV] 透視轉換

#include <stdlib.h>
#include <string.h>
// OpenCV
#include <opencv/cxcore.h>
#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <opencv/cvaux.h>

using namespace std;
using namespace cv;

int main()
{
 IplImage* grey = cvLoadImage("fix.png");
 IplImage* Img_old = cvCloneImage(grey);

 CvPoint2D32f src[4];
 CvPoint2D32f dst[4];

    //原影像的四個頂點
 src[0].x = 632;
 src[0].y = 434;
 src[1].x = 740;
 src[1].y = 434;
 src[2].x = 273;
 src[2].y = 642;
 src[3].x = 1048;
 src[3].y = 642;

    //目標影像的四個頂點
 dst[0].x = 1;
 dst[0].y = 1;
 dst[1].x = 1280;
 dst[1].y = 1;
 dst[2].x = 1;
 dst[2].y = 720;
 dst[3].x = 1280;
 dst[3].y = 720;

 float newm[9];
 CvMat newM = cvMat( 3, 3, CV_32F, newm );
 //獲得透視轉換矩陣
 cvWarpPerspectiveQMatrix(src,dst,&newM);
 //透視轉換
 cvWarpPerspective(Img_old,grey,&newM,CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS, cvScalarAll(0));
 cvShowImage("原影像",Img_old);
 cvShowImage("目標影像",grey);

 //逆轉換
 cvWarpPerspectiveQMatrix(dst,src,&newM);
 cvWarpPerspective(grey,Img_old,&newM,CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS, cvScalarAll(0));
 cvShowImage("逆轉換後",Img_old);

 cvWaitKey(0);

 return  0;
}

原始影像

透視轉換

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