学步园

#include "stdafx.h"
#include <cv.h>
#include <highgui.h>


int main(int argc, char** argv)
{
   CvPoint2D32f srcQuad[4], dstQuad[4];
   CvMat* warp_matrix = cvCreateMat(3,3,CV_32FC1);
   IplImage *src, *dst;
    if( argc == 1 && ((src=cvLoadImage("lena.jpg",1)) != 0 ))
    {
   dst = cvCloneImage(src);
   dst->origin = src->origin;
   cvZero(dst);


   srcQuad[0].x = 0;           //src Top left
   srcQuad[0].y = 0;
   srcQuad[1].x = src->width - 1;  //src Top right
   srcQuad[1].y = 0;
   srcQuad[2].x = 0;           //src Bottom left
   srcQuad[2].y = src->height - 1;
   srcQuad[3].x = src->width - 1;  //src Bot right
   srcQuad[3].y = src->height - 1;
      //- - - - - - - - - - - - - -//
   dstQuad[0].x = src->width*0.05;  //dst Top left
   dstQuad[0].y = src->height*0.33;
   dstQuad[1].x = src->width*0.9;  //dst Top right
   dstQuad[1].y = src->height*0.25;
   dstQuad[2].x = src->width*0.2;  //dst Bottom left
   dstQuad[2].y = src->height*0.7;      
   dstQuad[3].x = src->width*0.8;  //dst Bot right
   dstQuad[3].y = src->height*0.9;


   cvGetPerspectiveTransform(srcQuad,dstQuad,
                                     warp_matrix);//由四对点计算透射变换 


   cvWarpPerspective(src,dst,warp_matrix);//对图像进行透视变换 


   cvNamedWindow( "Perspective_Warp", 1 );
      cvShowImage( "Perspective_Warp", dst );
      cvWaitKey();
    }
   cvReleaseImage(&dst);
   cvReleaseMat(&warp_matrix);
    return 0;
}

运行结果