cv2DRotationMatrix  231 modules/imgproc/include/opencv2/imgproc/imgproc_c.h CVAPI(CvMat*)  cv2DRotationMatrix( CvPoint2D32f center, double angle,
cv2DRotationMatrix 1384 modules/imgproc/test/test_imgwarp.cpp     cv2DRotationMatrix(cvPoint2D32f(w*0.5f, h*0.5f), 45.0, 1.0, &M);