AffineTransform.cpp

//
//  AffineTransform.cpp
//  LearningOpenCV
//
//  Created by YourtionGuo on 7/28/16.
//  Copyright © 2016 Yourtion. All rights reserved.
//

#include <iostream>
#include <highgui.h>
#include <cv.h>

int main(int argc, const char * argv[]) {
    
    CvPoint2D32f srcTri[3], dstTri[3];
    CvMat* rot_mat = cvCreateMat(2, 3, CV_32FC1);
    CvMat* warp_mat = cvCreateMat(2, 3, CV_32FC1);
    IplImage *src, *dst;
    
    if (argc == 2 && ((src = cvLoadImage(argv[1], 1)) != 0)) {
        dst = cvCloneImage( src );
        dst->origin = src->origin;
        cvZero( dst );
        
        // warp matrix
        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;
        dstTri[0].x = src->width * 0.0;
        dstTri[0].y = src->height * 0.33;
        dstTri[1].x = src->width * 0.85;
        dstTri[1].y = src->height * 0.25;
        dstTri[2].x = src->width * 0.15;
        dstTri[2].y = src->height * 0.7;
        
        cvGetAffineTransform( srcTri, dstTri, warp_mat );
        cvWarpAffine( src, dst, warp_mat );
        cvCopy( dst, src );
        
        // rotation matrix
        CvPoint2D32f center = cvPoint2D32f( src->width/2, src->height/2 );
        double angle = -50.0;
        double scale = 0.6;
        
        cv2DRotationMatrix( center, angle, scale, rot_mat );
        cvWarpAffine( src, dst, rot_mat );
        
        cvNamedWindow( "Affine_Transform", 1 );
        cvShowImage( "Affine_Transform" , dst );
        
        cvWaitKey();

        cvReleaseImage( &dst );

    }
    
    cvReleaseMat( &rot_mat );
    cvReleaseMat( &warp_mat );
    
    return 0;
}