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//2020.6.21_P77_OpenCV投影变换
//通过鼠标事件在原图和输出的画布上选取四组对应的坐标
//投影矩阵的数据类型为CV_64F
//txwtech
//2020.6.21_P77_OpenCV投影变换
//通过鼠标事件在原图和输出的画布上选取四组对应的坐标
//投影矩阵的数据类型为CV_64F
//txwtech
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>
using namespace cv;Mat I;
Mat pI;
Point2f IPoint, pIPoint;
int i = 0, j = 0;
Point2f src[4];
Point2f dst[4];
void mouse_I(int event, int x, int y, int flags, void *param)
{switch (event){case CV_EVENT_LBUTTONDOWN:IPoint = Point2f(x,y);break;case CV_EVENT_LBUTTONUP:src[i] = IPoint;circle(I,src[i],7,Scalar(0),3);i += 1;break;default:break;}
}
void mouse_pI(int event, int x, int y, int flags, void *param)
{switch (event){case CV_EVENT_LBUTTONDOWN:pIPoint = Point2f(x,y);break;case CV_EVENT_LBUTTONUP:dst[j] = pIPoint;circle(pI,dst[j],7,Scalar(0),3);j += 1;break;default:break;}
}
int main(int argc, char *agrv[])
{I = imread("D:\\pictures\\book1.jpg",CV_LOAD_IMAGE_GRAYSCALE);if (!I.data)return -1;pI = 255*Mat::ones(I.size(),CV_8UC1);namedWindow("I",1); //window auto size=1setMouseCallback("I",mouse_I,NULL);namedWindow("pI",1);setMouseCallback("pI",mouse_pI,NULL);imshow("I",I);imshow("pI",pI);while (!(i == 4 && j == 4)){imshow("I",I);//原图imshow("pI",pI);//投影变换后的图if (waitKey(50) == 'q')break;}imshow("I",I);imshow("pI",pI);setMouseCallback("I",NULL,NULL);setMouseCallback("pI", NULL, NULL);Mat p = getPerspectiveTransform(src,dst);//计算投影变换矩阵Mat result;warpPerspective(I,result,p,pI.size());//投影变换imshow("投影后的效果",result);waitKey(0);return 0;}
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