编辑:反对投票者:请评论反对对久经考验的代码投票的原因?
#include "cv.h"
#include "highgui.h"
#include "math.h"
int main( int argc, char** argv )
{
IplImage* src = cvLoadImage("lena.jpg", 1);
IplImage* dst = cvCloneImage( src );
int delta = 1;
int angle = 0;
int opt = 1; // 1: rotate & zoom
// 0: rotate only
double factor;
cvNamedWindow("src", 1);
cvShowImage("src", src);
for(;;)
{
float m[6];
CvMat M = cvMat(2, 3, CV_32F, m);
int w = src->width;
int h = src->height;
if(opt)
factor = (cos(angle*CV_PI/180.) + 1.05) * 2;
else
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];
m[2] = w*0.5f;
m[5] = h*0.5f;
cvGetQuadrangleSubPix( src, dst, &M);
cvNamedWindow("dst", 1);
cvShowImage("dst", dst);
if( cvWaitKey(1) == 27 )
break;
angle =(int)(angle + delta) % 360;
}
return 0;
}
更新:使用warpaffine
https://code.google.com/p/opencvjp-sample/source/browse/trunk/cpp/affine2_cpp.cpp?r=48查看以下代码
#include <cv.h>
#include <highgui.h>
using namespace cv;
int
main(int argc, char **argv)
{
// (1)load a specified file as a 3-channel color image,
// set its ROI, and allocate a destination image
const string imagename = argc > 1 ? argv[1] : "../image/building.png";
Mat src_img = imread(imagename);
if(!src_img.data)
return -1;
Mat dst_img = src_img.clone();
// (2)set ROI
Rect roi_rect(cvRound(src_img.cols*0.25), cvRound(src_img.rows*0.25), cvRound(src_img.cols*0.5), cvRound(src_img.rows*0.5));
Mat src_roi(src_img, roi_rect);
Mat dst_roi(dst_img, roi_rect);
// (2)With specified three parameters (angle, rotation center, scale)
// calculate an affine transformation matrix by cv2DRotationMatrix
double angle = -45.0, scale = 1.0;
Point2d center(src_roi.cols*0.5, src_roi.rows*0.5);
const Mat affine_matrix = getRotationMatrix2D( center, angle, scale );
// (3)rotate the image by warpAffine taking the affine matrix
warpAffine(src_roi, dst_roi, affine_matrix, dst_roi.size(), INTER_LINEAR, BORDER_CONSTANT, Scalar::all(255));
// (4)show source and destination images with a rectangle indicating ROI
rectangle(src_img, roi_rect.tl(), roi_rect.br(), Scalar(255,0,255), 2);
namedWindow("src", CV_WINDOW_AUTOSIZE);
namedWindow("dst", CV_WINDOW_AUTOSIZE);
imshow("src", src_img);
imshow("dst", dst_img);
waitKey(0);
return 0;
}