openCV 图像绕中心旋转

#include "cv.h"                             //  OpenCV 文件头#include "highgui.h"#include "cvaux.h"#include "cxcore.h"#include "opencv2/opencv.hpp"#include "opencv2/imgproc.hpp"#include <iostream>#include <string>using namespace cv;using namespace std;Mat rotateImage1(Mat img, int degree){degree = -degree;double angle = degree  * CV_PI / 180.; // 弧度  double a = sin(angle), b = cos(angle);int width = img.cols;int height = img.rows;int width_rotate = int(height * fabs(a) + width * fabs(b));int height_rotate = int(width * fabs(a) + height * fabs(b));//旋转数组map// [ m0  m1  m2 ] ===>  [ A11  A12   b1 ]// [ m3  m4  m5 ] ===>  [ A21  A22   b2 ]float map[6];Mat map_matrix = Mat(2, 3, CV_32F, map);// 旋转中心CvPoint2D32f center = cvPoint2D32f(width / 2, height / 2);CvMat map_matrix2 = map_matrix;cv2DRotationMatrix(center, degree, 1.0, &map_matrix2);map[2] += (width_rotate - width) / 2;map[5] += (height_rotate - height) / 2;Mat img_rotate;//对图像做仿射变换//CV_WARP_FILL_OUTLIERS - 填充所有输出图像的象素。//如果部分象素落在输入图像的边界外，那么它们的值设定为 fillval.//CV_WARP_INVERSE_MAP - 指定 map_matrix 是输出图像到输入图像的反变换，warpAffine(img, img_rotate, map_matrix, Size(width_rotate, height_rotate), 1, 0, 0);return img_rotate;}int main(int argc, char *argv[]){int degree;Mat m_SrcImg;m_SrcImg = imread("lena2.jpg");namedWindow("原图像", 1);imshow("原图像", m_SrcImg);cout << "请输入旋转的度数：";cin >> degree;Mat m_ResImg = rotateImage1(m_SrcImg, degree);namedWindow("旋转后图像", 1);imshow("旋转后图像", m_ResImg);waitKey(0);}