OpenCv在Qt中的使用

1.使用OpenCV進行打開攝像頭並進行錄像

1.     CvCapture *capture;  
2.     IplImage *frame;  
3.     QImage *qImg;  
4.     QTimer *timer;  
5.     capture = cvCaptureFromCAM(0);  
6.     cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH,320);  
7.     cvSetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT,240);  
8.     if(capture)  
9.     {  
10.         QMessageBox::information(this,"Information","successful!");  
11.         if (capture)  
12.         {  
13.             frame = cvQueryFrame(capture);  
14.             if (frame)  
15.                 this->resize(frame->width,frame->height);  
16.             qImg = new QImage(QSize(frame->width,frame->height),QImage::Format_RGB888);  
17.             iplImg = cvCreateImageHeader(cvSize(frame->width,frame->height),8,3);  
18.             iplImg->imageData = (char*)qImg->bits();  
19.             timer = new QTimer(this);  
20.             timer->setInterval(30);  
21.             connect(timer,SIGNAL(timeout()),this,SLOT(nextFrame()));  
22.             timer->start();  
23.             writer = cvCreateVideoWriter("out.avi",CV_FOURCC('D', 'I', 'V', 'X'),10,  
24.                                          cvSize(frame->width,frame->height),1);  
25.             isCamera = true;  
26.         }  
27.     }  
28.     else  
29.     {  
30.         QMessageBox::information(this,"Information","Sorry,fail!");  
31.         isCamera = false;  
32.     }  
33. void openCV::paintEvent(QPaintEvent *e)  
34. {  
35.     QPainter painter(this);  
36.     if(isCamera == true)  
37.     {  
38.         painter.drawImage(QPoint(0,0),*qImg);  
39.     }  
40.     else  
41.     {  
42.           
43.     }  
44. }  
45. void openCV::nextFrame()  
46. {  
47.     frame = cvQueryFrame(capture);  
48.   
49.     if (frame)  
50.     {  
51.         if (frame->origin == IPL_ORIGIN_TL)  
52.         {  
53.             cvCopy(frame,iplImg,0);  
54.         }  
55.         else  
56.         {  
57.             cvFlip(frame,iplImg,0);  
58.         }  
59.         cvCvtColor(iplImg,iplImg,CV_BGR2RGB);  
60.         cvWriteFrame(writer,frame);  
61.         this->update();  
62.     }  
63. }  

在編譯的目錄下就有out.avi這個視頻文件，要打開視頻文件如下：

1.     CvCapture *capture;  
2.     IplImage *frame;  
3.     QImage *qImg;  
4.     QTimer *timer;  
5.     capture = cvCaptureFromFile("out.avi");  
6.     if (capture)  
7.     {  
8.         frame = cvQueryFrame(capture);  
9.         if (frame)  
10.             this->resize(frame->width,frame->height);  
11.         qImg = new QImage(QSize(frame->width,frame->height),QImage::Format_RGB888);  
12.         iplImg = cvCreateImageHeader(cvSize(frame->width,frame->height),8,3);  
13.         iplImg->imageData = (char*)qImg->bits();  
14.         timer = new QTimer(this);  
15.         timer->setInterval(30);  
16.         connect(timer,SIGNAL(timeout()),this,SLOT(nextFrame()));  
17.         timer->start();  
18.               
19.         isCamera = true;  
20.     }  
21.     else  
22.     {  
23.         QMessageBox::information(this,"Information","Sorry,fail!");  
24.         isCamera = false;  
25.     }  
26. void openCV::paintEvent(QPaintEvent *e)  
27. {  
28.     QPainter painter(this);  
29.     if(isCamera == true)  
30.     {  
31.         painter.drawImage(QPoint(0,0),*qImg);  
32.     }  
33.     else  
34.     {  
35.           
36.     }  
37. }  
38. void openCV::nextFrame()  
39. {  
40.     frame = cvQueryFrame(capture);  
41.   
42.     if (frame)  
43.     {  
44.         if (frame->origin == IPL_ORIGIN_TL)  
45.         {  
46.             cvCopy(frame,iplImg,0);  
47.         }  
48.         else  
49.         {  
50.             cvFlip(frame,iplImg,0);  
51.         }  
52.         cvCvtColor(iplImg,iplImg,CV_BGR2RGB);  
53.         this->update();  
54.     }  
55. }