一、鼠标截图
1 //鼠标截图 2 #include<opencv2/opencv.hpp> 3 #include<iostream> 4 5 using namespace cv; 6 using namespace std; 7 8 Mat img=imread("1.jpg"); 9 Mat temp=img.clone(); 10 Mat ROI; 11 Point pt; 12 bool flag=false; 13 14 void onMouse(int event,int x,int y,int flag,void* param){ 15 switch (event) 16 { 17 case CV_EVENT_LBUTTONDOWN://鼠标左键按下 18 //cout<<"鼠标左键按下"<<endl; 19 flag=true; 20 pt.x=x; 21 pt.y=y; 22 break; 23 case CV_EVENT_MOUSEMOVE://鼠标移动 24 //cout<<"鼠标移动"<<endl; 25 if(flag){ 26 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） 27 rectangle(img,pt,Point(x,y),Scalar(0,255,0),2,8); 28 } 29 break; 30 case CV_EVENT_LBUTTONUP://鼠标左键抬起 31 //cout<<"鼠标抬起"<<endl; 32 flag=false; 33 //ROI=img(Rect(pt.x,pt.y,x-pt.x,y-pt.y));//确定ROI区域,有矩形边框 34 ROI=temp(Rect(pt.x,pt.y,x-pt.x,y-pt.y));//无矩形边框 35 imshow("ROI",ROI); 36 imwrite("ROI.jpg",ROI); 37 break; 38 default: 39 break; 40 } 41 } 42 43 int main(){ 44 namedWindow("mouse",CV_WINDOW_AUTOSIZE); 45 setMouseCallback("mouse",onMouse,0); 46 while(1){ 47 imshow("mouse",img); 48 if(27==waitKey(10))//esc跳出循环 49 break; 50 } 51 return 0; 52 }
二、滑动条视频播放
1 #include<opencv2/opencv.hpp> 2 #include<iostream> 3 #include<stdio.h> 4 5 using namespace cv; 6 using namespace std; 7 8 VideoCapture cap; 9 int value = 0; 10 void onChange(int pos,void*){ 11 cap.set(CV_CAP_PROP_POS_FRAMES,pos);//设置视频帧位置 12 } 13 14 int main(){ 15 Mat frame; 16 char strFps[20]; 17 cap.open("1.mp4"); 18 namedWindow("video",CV_WINDOW_AUTOSIZE); 19 int frameCount=cap.get(CV_CAP_PROP_FRAME_COUNT);//获取视频总帧数 20 createTrackbar("Frame","video",&value,frameCount,onChange); 21 22 if(cap.isOpened()){//如果视频成功打开 23 while(1){ 24 double Fps=cap.get(CV_CAP_PROP_FPS);//获得视频帧率 25 sprintf(strFps,"Fps%0.1f/s",Fps);//格式化字符串 26 27 int framePos= (int)cap.get(CV_CAP_PROP_POS_FRAMES);//获取视频帧位置 28 cout << "current pos : " << framePos << endl; 29 setTrackbarPos("Frame","video",framePos);//设置滑动条位置 30 cap>>frame; 31 if(!frame.empty()){//如果该帧不为空 32 putText(frame,strFps,Point(5,30),CV_FONT_HERSHEY_COMPLEX_SMALL,1,Scalar(0,255,0),2,8); 33 imshow("video",frame); 34 if(27==waitKey(1000/Fps))//esc退出，1000/Fps毫秒刷新 35 break; 36 } 37 } 38 } 39 return 0; 40 }
