코드 4-5 카메라 입력을 반전하여 동영상 파일로 저장하기 [ch04/video]

01    void camera_in_video_out()
02    {
03        VideoCapture cap(0);
04     
05        if (!cap.isOpened()) {
06            cerr << "Camera open failed!" << endl;
07            return;
08        }
09     
10        int w = cvRound(cap.get(CAP_PROP_FRAME_WIDTH));
11        int h = cvRound(cap.get(CAP_PROP_FRAME_HEIGHT));
12        double fps = cap.get(CAP_PROP_FPS);
13     
14        int fourcc = VideoWriter::fourcc('D', 'I', 'V', 'X');
15        int delay = cvRound(1000 / fps);
16     
17        VideoWriter outputVideo("output.avi", fourcc, fps, Size(w, h));
18     
19        if (!outputVideo.isOpened()) {
20            cout << "File open failed!" << endl;
21            return;
22        }
23     
24        Mat frame, inversed;
25        while (true) {
26            cap >> frame;
27            if (frame.empty())
28                break;
29     
30            inversed = ~frame;
31            outputVideo << inversed;
32     
33            imshow("frame", frame);
34            imshow("inversed", inversed);
35     
36            if (waitKey(delay) = = 27)
37                break;
38        }
39     
40        destroyAllWindows();
41    }

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