cvGetQuadrangleSubPix 进行图像旋转(转自CSDN)

#include "cv.h"
#include "highgui.h"
#include "math.h"

int main( int argc, char** argv )
{
    IplImage* src;
    /* the first command line parameter must be image file name */
    if( argc==2 && (src = cvLoadImage(argv[1], -1))!=0)
    {
        IplImage* dst = cvCloneImage( src );
        int delta = 1;
        int angle = 0;

        cvNamedWindow( "src", 1 );
        cvShowImage( "src", src );

        for(;;)
        {
            float m[6];
            double factor = (cos(angle*CV_PI/180.) + 1.1)*3;
            CvMat M = cvMat( 2, 3, CV_32F, m );
            int w = src->width;
            int h = src->height;

            m[0] = (float)(factor*cos(-angle*2*CV_PI/180.));
            m[1] = (float)(factor*sin(-angle*2*CV_PI/180.));
            m[2] = w*0.5f;
            m[3] = -m[1];
            m[4] = m[0];
            m[5] = h*0.5f;

            cvGetQuadrangleSubPix( src, dst, &M, 1, cvScalarAll(0));

            cvNamedWindow( "dst", 1 );
            cvShowImage( "dst", dst );

            if( cvWaitKey(5) == 27 )
                break;

            angle = (angle + delta) % 360;
        }
    }
    return 0;
}