Opencv下如何旋转图形？

[runnel04]

IplImage* img;
cvLoadImage(/**/,img);
给写个旋转30°的例子吧！

[victory06057231]

//图像旋转,angle是角度
IplImage* FitRotate (IplImage* Img_old, double angle)
{

IplImage* Img_tmp = NULL; 

double anglerad  = (CV_PI* (angle/180)) ;
int newheight =int (fabs(( sin(anglerad)*Img_old->width )) + fabs(( cos(anglerad)*Img_old->height )) );
int newwidth  =int (fabs(( sin(anglerad)*Img_old->height)) + fabs(( cos(anglerad)*Img_old->width)) );
     
Img_tmp = cvCreateImage(cvSize(newwidth,newheight), IPL_DEPTH_8U, 3);
cvFillImage(Img_tmp,0);//目的图像 使用扩展的大小

IplImage* dst = cvCloneImage( Img_old );//目的图像 与原图像等大  

float m[6];            
CvMat M = cvMat( 2, 3, CV_32F, m );
int w = Img_old->width;
int h = Img_old->height;

m[0] = (float)(cos(angle*CV_PI/180.));
m[1] = (float)(sin(angle*CV_PI/180.));
m[2] = w*0.5f;
m[3] = -m[1];
m[4] = m[0];
m[5] = h*0.5f;
          
cvGetQuadrangleSubPix( Img_old, dst, &M);
cvGetQuadrangleSubPix( Img_old, Img_tmp, &M);
  return Img_tmp;
}

[libralibra]

Mat rotateImage(const Mat& source, double angle)
{
    Point2f src_center(source.cols/2.0F, source.rows/2.0F);
    Mat rot_mat = getRotationMatrix2D(src_center, angle, 1.0);
    Mat dst;
    warpAffine(source, dst, rot_mat, source.size());
    return dst;
}

angle 是角度不是弧度

[赵4老师]

C:\Program Files\OpenCV\modules\gpu\src\imgproc_gpu.cpp
59: void cv::gpu::rotate(const GpuMat&, GpuMat&, Size, double, double, double, int, Stream&) { throw_nogpu(); }
510: void cv::gpu::rotate(const GpuMat& src, GpuMat& dst, Size dsize, double angle, double xShift, double yShift, int interpolation, Stream& s)

[sdjuanzi]

请问你知道用哪个函数旋转了吗？我也想知道

[MTXING]

二楼正解，3Q~