图片的旋转与放缩

来源：互联网发布：仙剑三mac打不开编辑：程序博客网时间：2024/05/18 23:25

void size()
{
IplImage *src =cvLoadImage("first3.bmp",0);
IplImage *dst = 0;
  int delta = 1;
  int angle = 0;
  int opt = 1;
  double factor;

  dst = cvCloneImage (src);
  cvNamedWindow ("src", 1);
  cvShowImage ("src", src);

  for (;;)
  {
   float m[6];
   // Matrix m looks like:
   //
   // [ m0 m1 m2 ] ===> [ A11 A12   b1 ]
   // [ m3 m4 m5 ]       [ A21 A22   b2 ]
   //
   CvMat M = cvMat (2, 3, CV_32F, m);
   int w = src->width;
   int h = src->height;
   if (opt)  // 旋转加缩放
    factor = (cos (angle * CV_PI / 180.) + 1.0) * 2;
   else   // 仅仅旋转
    factor = 1;
   m[0] = (float) (factor * cos (-angle * 2 * CV_PI / 180.));
   m[1] = (float) (factor * sin (-angle * 2 * CV_PI / 180.));
   m[3] = -m[1];
   m[4] = m[0];
   // 将旋转中心移至图像中间
   m[2] = w * 0.5f;
   m[5] = h * 0.5f;
   // dst(x,y) = A * src(x,y) + b
   cvZero (dst);
   cvGetQuadrangleSubPix (src, dst, &M);
   cvNamedWindow ("dst", 1);
    cvMoveWindow("dst",200,200);
   cvShowImage ("dst", dst);
   if (cvWaitKey (1) == 27) //ESC
    break;
   angle = (int) (angle + delta) % 360;
  }   // for-loop
}