opencv透视变换

 1 #include <cv.h>
 2 #include <highgui.h>
 3 #include <iostream>
 4 #include <vector>
 5 #include <fstream>
 6 
 7 using namespace std;
 8 using namespace cv;
 9 
10 Mat rawImg, dstImg,boardImg,dstboard,maskboard;
11 vector<Point2f>srcQuad(4);
12 vector<Point2f>dstQuad(4);
13 
14 void on_mouse(int event, int x, int y, int flags, void *ustc)//event鼠标事件代号，x,y鼠标坐标，flags拖拽和键盘操作的代号
15 {
16     Point pt;//坐标点;
17     char coordinateName[16];
18     static int n=0;
19 
20     if (event == CV_EVENT_LBUTTONDOWN)//左键按下，读取坐标，并在图像上该点处划圆
21     {
22         pt = Point(x, y);
23         cout << x << " " << y << endl;
24         dstQuad[n] = pt;
25         n++;
26         circle(boardImg, pt, 2, Scalar(255, 0, 0, 0), CV_FILLED, CV_AA, 0);//划圆
27         sprintf(coordinateName, "(%d,%d)", x, y);
28         putText(boardImg, coordinateName, pt, FONT_HERSHEY_SIMPLEX, 0.5, Scalar(0, 0, 0, 255), 1, 8);//在窗口上显示坐标
29         if (n >= 4)
30         {
31             //imshow("board", boardImg);
32             cvDestroyAllWindows();
33         }
34     }
35 }
36 int main()
37 {
38     rawImg = imread("lena.jpg",0);//图片路径
39     boardImg = imread("board.jpg",0);
40     dstboard = boardImg.clone();
41     cvNamedWindow("board",0);
42     setMouseCallback("board",on_mouse,0);
43     imshow("board",boardImg);
44     waitKey(0);
45     imshow("raw", rawImg);
46     imshow("board", boardImg);
47     int imgHeigth = rawImg.rows;
48     int imgWidth = rawImg.cols;
49     int dstHeigth = boardImg.rows;
50     int dstWidth = boardImg.cols;
51     srcQuad[0] = Point2f(0,0);//左上 右上 左下 右下
52     srcQuad[1] = Point2f(imgWidth-1, 0);
53     srcQuad[2] = Point2f(0, imgHeigth - 1);
54     srcQuad[3] = Point2f(imgWidth - 1, imgHeigth - 1);
55     /*dstQuad[0] = Point2f(imgWidth*0.05, imgHeigth*0.33);
56     dstQuad[1] = Point2f(imgWidth*0.9, imgHeigth*0.25);
57     dstQuad[2] = Point2f(imgWidth*0.2, imgHeigth*0.7);
58     dstQuad[3] = Point2f(imgWidth*0.8, imgHeigth*0.9);*/
59     for (int i = 0; i < 4; i++)
60         cout << dstQuad[i] << endl;
61 
62     Mat warpMatrix = getPerspectiveTransform(srcQuad, dstQuad);
63     cout << warpMatrix << endl;
64     warpPerspective(rawImg, dstImg, warpMatrix, Size(dstWidth, dstHeigth));
65 
66     threshold(dstImg, maskboard, 0, 1, THRESH_BINARY);
67     cout << "begin a test of cout to file." << endl;
68     // 保存cout流缓冲区指针
69     streambuf* coutBuf = cout.rdbuf();
70     ofstream of("out.txt");
71     // 获取文件out.txt流缓冲区指针
72     streambuf* fileBuf = of.rdbuf();
73     // 设置cout流缓冲区指针为out.txt的流缓冲区指针
74     cout.rdbuf(fileBuf);
75     cout << maskboard << endl;
76 
77     of.flush();
78     of.close();
79     // 恢复cout原来的流缓冲区指针
80     cout.rdbuf(coutBuf);
81     //imshow("rawboard", dstboard);
82     cout << "Write Personal Information over..." << endl;
83     for (int i = 0; i < dstHeigth - 1; i++)
84         for (int j = 0; j < dstWidth - 1; j++)
85             dstImg.at<uchar>(i, j) = dstImg.at<uchar>(i, j)*maskboard.at<uchar>(i, j)
86             + dstboard.at<uchar>(i, j)*(1-maskboard.at<uchar>(i, j));
87     imshow("result", dstImg);
88     waitKey();
89     return 0;
90 }