18-4.cpp

基于OpenCV的计算机视觉技术实现.rar

// ************************* 程序 18-4 ****************************
/*** 程序功能：
    对程序进行旋转缩放

// ***************************************************************/


//
/*

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

int main ( int argc, char **argv )
{
    IplImage *src = 0;
    IplImage *dst = 0; 

    if ( ( argc == 2 ) && ( src = cvLoadImage ( argv[1], -1 ) ) != 0 )
    {
        int delta = 1;
        int angle = 0;
        int opt = 0;        // 1： 旋转加缩放
        // 0:  仅仅旋转
        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 );
            cvShowImage ( "dst", dst );
            if ( cvWaitKey ( 1 ) == 27 )
            {
                break;
            }
            angle = ( int ) ( angle + delta ) % 360;
        } // for-loop
    }
    return 0;
}


  //*/