//2020.6.21_P77_OpenCV transformación de proyección
// Seleccione cuatro conjuntos de coordenadas correspondientes en la imagen original y el lienzo de salida a través de eventos del mouse
// El tipo de datos de la matriz de proyección es 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=1
setMouseCallback("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;
}