OpenCV 截图程序

开发平台

win10 64位、codeblocks

源代码

#include <opencv/cv.h>
#include <opencv/highgui.h>
using namespace cv;

int x1,y1,x2,y2;

void capture(int event,int x,int y,int flags,void *param)
{
    if (event == CV_EVENT_LBUTTONDOWN)
    {
        x1=x;
        y1=y;
    }
    else if (event == CV_EVENT_LBUTTONUP)
    {
        x2=x;
        y2=y;
    }
}

int main(int argc, char *argv[])
{
    CvMat *src=cvLoadImageM("road_trip.jpg",1);
    cvShowImage("src",src);
    x1=0;y1=0;x2=640;y2=345;
    cvSetMouseCallback("src",capture,NULL);
    int key = cvWaitKey(0);
    while(key!=27){
        if (key==13) // 按下`Enter`键开始截图
        {
            CvRect rect={x1,y1,x2-x1,y2-y1};
            CvMat head;
            CvMat *dest=cvGetSubRect(src,&head,rect);
            cvShowImage("dest",dest);
        }
        key = cvWaitKey(0);
    };
    cvReleaseMat(&src);
    cvDestroyAllWindows();
    return 0;
}