一、鼠标截图
1 #include<opencv2/opencv.hpp> 2 #include<iostream> 3 using namespace cv; 4 using namespace std; 5 6 Mat img=imread("E://1.jpg"); 7 Mat temp=img.clone(); 8 Mat ROI; 9 Point pt; 10 bool flag=false; 11 12 void onMouse(int event,int x,int y,int flag,void* param){ 13 switch (event) 14 { 15 case CV_EVENT_LBUTTONDOWN://鼠标左键按下 16 //cout<<"鼠标左键按下"<<endl; 17 flag=true; 18 pt.x=x; 19 pt.y=y; 20 break; 21 case CV_EVENT_MOUSEMOVE://鼠标移动 22 //cout<<"鼠标移动"<<endl; 23 if(flag){ 24 temp.copyTo(img);//temp复制给img（相当于恢复成原图），以便永远只有一个矩形（否则许多矩形会重叠在一起） 25 rectangle(img,pt,Point(x,y),Scalar(0,255,0),2,8); 26 } 27 break; 28 case CV_EVENT_LBUTTONUP://鼠标左键抬起 29 //cout<<"鼠标抬起"<<endl; 30 flag=false; 31 //ROI=img(Rect(pt.x,pt.y,x-pt.x,y-pt.y));//确定ROI区域,有矩形边框 32 ROI=temp(Rect(pt.x,pt.y,x-pt.x,y-pt.y));//无矩形边框 33 imshow("ROI",ROI); 34 imwrite("E://ROI.jpg",ROI); 35 break; 36 default: 37 break; 38 } 39 } 40 41 void main(){ 42 namedWindow("mouse",CV_WINDOW_AUTOSIZE); 43 setMouseCallback("mouse",onMouse,0); 44 while(1){ 45 imshow("mouse",img); 46 if(27==waitKey(10))//esc跳出循环 47 break; 48 } 49 }
二、滑动条视频播放
1 #include<opencv2/opencv.hpp> 2 #include<iostream> 3 using namespace cv; 4 using namespace std; 5 6 int value; 7 void onChange(int,void* param){ 8 VideoCapture cap=*(VideoCapture*)param; 9 cap.set(CV_CAP_PROP_POS_FRAMES,value);//设置视频帧位置 10 } 11 12 void main(){ 13 Mat frame; 14 char strFps[20]; 15 VideoCapture cap("E://2.avi"); 16 namedWindow("video",CV_WINDOW_AUTOSIZE); 17 int frameCount=cap.get(CV_CAP_PROP_FRAME_COUNT);//获取视频总帧数 18 createTrackbar("Frame","video",&value,frameCount,onChange,&cap); 19 20 if(cap.isOpened()){//如果视频成功打开 21 while(1){ 22 double Fps=cap.get(CV_CAP_PROP_FPS);//获得视频帧率 23 sprintf(strFps,"Fps%0.1f/s",Fps);//格式化字符串 24 int framePos=cap.get(CV_CAP_PROP_POS_FRAMES);//获取视频帧位置 25 setTrackbarPos("Frame","video",framePos);//设置滑动条位置 26 cap>>frame; 27 if(!frame.empty()){//如果该帧不为空 28 putText(frame,strFps,Point(5,30),CV_FONT_HERSHEY_COMPLEX_SMALL,1,Scalar(0,255,0),2,8); 29 imshow("video",frame); 30 if(27==waitKey(1000/Fps))//esc退出，1000/Fps毫秒刷新 31 break; 32 } 33 } 34 } 35 }
