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. {
43. }
44. }
45. void openCV::nextFrame()
46. {
47. frame = cvQueryFrame(capture);
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();
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. {
36. }
37. }
38. void openCV::nextFrame()
39. {
40. frame = cvQueryFrame(capture);
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. }