OpenCV 仿射变换

 1 #include "opencv2/highgui/highgui.hpp"
 2 #include "opencv2/imgproc/imgproc.hpp"
 3 #include <iostream>
 4 #include <stdio.h>
 5 
 6 using namespace cv;
 7 using namespace std;
 8 
 9 /// 全局变量
10 char* source_window = "Source image";
11 char* warp_window = "Warp";
12 char* warp_rotate_window = "Warp + Rotate";
13 
14 /** @function main */
15  int main( int argc, char** argv )
16  {
17    Point2f srcTri[3];
18    Point2f dstTri[3];
19 
20    Mat rot_mat( 2, 3, CV_32FC1 );
21    Mat warp_mat( 2, 3, CV_32FC1 );
22    Mat src, warp_dst, warp_rotate_dst;
23 
24    /// 加载源图像
25    src = imread( argv[1], 1 );
26 
27    /// 设置目标图像的大小和类型与源图像一致
28    warp_dst = Mat::zeros( src.rows, src.cols, src.type() );
29 
30    /// 设置源图像和目标图像上的三组点以计算仿射变换
31    srcTri[0] = Point2f( 0,0 );
32    srcTri[1] = Point2f( src.cols - 1, 0 );
33    srcTri[2] = Point2f( 0, src.rows - 1 );
34 
35    dstTri[0] = Point2f( src.cols*0.0, src.rows*0.33 );
36    dstTri[1] = Point2f( src.cols*0.85, src.rows*0.25 );
37    dstTri[2] = Point2f( src.cols*0.15, src.rows*0.7 );
38 
39    /// 求得仿射变换
40    warp_mat = getAffineTransform( srcTri, dstTri );
41 
42    /// 对源图像应用上面求得的仿射变换
43    warpAffine( src, warp_dst, warp_mat, warp_dst.size() );
44 
45    /** 对图像扭曲后再旋转 */
46 
47    /// 计算绕图像中点顺时针旋转50度缩放因子为0.6的旋转矩阵
48    Point center = Point( warp_dst.cols/2, warp_dst.rows/2 );
49    double angle = -50.0;
50    double scale = 0.6;
51 
52    /// 通过上面的旋转细节信息求得旋转矩阵
53    rot_mat = getRotationMatrix2D( center, angle, scale );
54 
55    /// 旋转已扭曲图像
56    warpAffine( warp_dst, warp_rotate_dst, rot_mat, warp_dst.size() );
57 
58    /// 显示结果
59    namedWindow( source_window, CV_WINDOW_AUTOSIZE );
60    imshow( source_window, src );
61 
62    namedWindow( warp_window, CV_WINDOW_AUTOSIZE );
63    imshow( warp_window, warp_dst );
64 
65    namedWindow( warp_rotate_window, CV_WINDOW_AUTOSIZE );
66    imshow( warp_rotate_window, warp_rotate_dst );
67 
68    /// 等待用户按任意按键退出程序
69    waitKey(0);
70 
71    return 0;
72   }