仿射变换

 

图像旋转
IplImage *rotateImage(const IplImage *src, float angleDegrees)
{
  // Create a map_matrix, where the left 2x2 matrix
  // is the transform and the right 2x1 is the dimensions.
  float m[6];
  CvMat M = cvMat(2, 3, CV_32F, m);
  int w = src->width;
  int h = src->height;
  float angleRadians = angleDegrees * ((float)CV_PI / 180.0f);
  m[0] = (float)( cos(angleRadians) );
  m[1] = (float)( sin(angleRadians) );
  m[3] = -m[1];
  m[4] = m[0];
  m[2] = w*0.5f;
  m[5] = h*0.5f;

  // Make a spare image for the result
  CvSize sizeRotated;
  sizeRotated.width = cvRound(w);
  sizeRotated.height = cvRound(h);

  // Rotate
  IplImage *imageRotated = cvCreateImage( sizeRotated,
   src->depth, src->nChannels );

  // Transform the image
  cvGetQuadrangleSubPix( src, imageRotated, &M);
   cvNamedWindow("dst",1); 
    cvShowImage("dst",imageRotated); 

  return imageRotated;
}

 

void main(int argc,char** argv) 

    IplImage *src = cvLoadImage("qb.jpg",1); 
 cvNamedWindow("src",1); 
    cvShowImage("src",src); 

 //rotateImage(src, 30);

 IplImage *dst = cvCloneImage(src);
 dst->origin=src->origin;
 cvZero(dst);

 CvPoint2D32f srcTri[4],dstTri[4];
 CvMat* rot_mat = cvCreateMat(3,3,CV_32FC1);
 CvMat* warp_mat = cvCreateMat(3,3,CV_32FC1);
 srcTri[0].x=0;
 srcTri[0].y=0;
 srcTri[1].x=src->width-1;
 srcTri[1].y=0;
 srcTri[2].x=0;
 srcTri[2].y=src->height-1;
 srcTri[3].x=src->width-1;
 srcTri[3].y=src->height-1;

 dstTri[0].x=src->width*0.0;
 dstTri[0].y=src->height*0.0;
 dstTri[1].x=src->width*0.85;
 dstTri[1].y=src->height*0.15;
 dstTri[2].x=src->width*0.15;
 dstTri[2].y=src->height*0.7;
 dstTri[3].x=src->width*0.8;
 dstTri[3].y=src->height*0.9;

 //cvGetAffineTransform(srcTri,dstTri,warp_mat);
 //cvWarpAffine(src,dst,warp_mat);

 cvGetPerspectiveTransform(srcTri,dstTri,warp_mat);
 cvWarpPerspective(src,dst,warp_mat);
  cvNamedWindow("dst0",1); 
    cvShowImage("dst0",dst);
 //cvCopy(dst,src);

 cvZero(dst);

/* CvPoint2D32f center=cvPoint2D32f(src->width/2,src->height/2);
 double angle=-30.0;//旋转角度
 double scale=1;//缩放比例
 cv2DRotationMatrix(center,angle,scale,rot_mat);

 cvWarpAffine(src,dst,rot_mat,CV_INTER_LINEAR);
     cvNamedWindow("dst1",1); 
    cvShowImage("dst1",dst); */

    cvWaitKey(0); 
 
        cvDestroyWindow("src"); 
    cvReleaseImage(&src); 
      cvDestroyWindow("dst"); 
    cvReleaseImage(&dst); 
 /*         cvDestroyWindow("g_plane"); 
    cvReleaseImage(&r_plane); 
        cvDestroyWindow("g_plane"); 
    cvReleaseImage(&b_plane); 
        cvDestroyWindow("b_plane"); 

  */
 

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