Qt5.3里使用OpenCV库采集摄像头图像保存为图片和视频

pro文件：

INCLUDEPATH += D:\Work\Video\OpenCV_Qt5.3\include\opencv \
               D:\Work\Video\OpenCV_Qt5.3\include\opencv2 \
               D:\Work\Video\OpenCV_Qt5.3\include
LIBS += D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_calib3d249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_contrib249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_core249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_features2d249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_flann249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_gpu249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_highgui249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_imgproc249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_legacy249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_ml249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_nonfree249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_objdetect249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_ocl249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_photo249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_stitching249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_superres249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_video249.dll.a \
    D:\Work\Video\OpenCV_Qt5.3\lib\libopencv_videostab249.dll.a

main.cpp

#include "opencv2/opencv.hpp"

using namespace cv;

using namespace std;

#include <QDebug>

int main()

{

    CvCapture *capture=cvCaptureFromCAM(0);

    CvVideoWriter *video=NULL;

    IplImage *frame=NULL;

    IplImage *pSaveFrame=NULL;

    int i=0;

    int p[3];

    p[0]=CV_IMWRITE_JPEG_QUALITY;

    p[1]=255;

    p[2]=255;

    int n;

    if(!capture)

    {

        qDebug()<<"Cannot open the camera.";

        return -1;

    }

    else

    {

        frame=cvQueryFrame(capture);

        video=cvCreateVideoWriter("camera.avi",

                                  CV_FOURCC('X','V','I','D'),

                                  25,

                                  cvSize(frame->width,frame->height));

        if(video)

        {

            qDebug()<<"VideoWriter has been created.";

        }

        cvNamedWindow("Camera Video",1);

        while(i<400)

        {

            frame=cvQueryFrame(capture);

            if(!frame)

            {

                qDebug()<<"Cannot get frame from the capture.";

                break;

            }

            n=cvWriteFrame(video,frame);

            qDebug()<<n;

            cvShowImage("Camera Video",frame);

            pSaveFrame=cvCreateImage(cvSize(frame->width,frame->height),

                                     frame->depth,

                                     frame->nChannels);

            QString strFilename=QString("%1.jpg").arg(i);

            char *chFilename;

            QByteArray ba=strFilename.toLatin1();

            chFilename=ba.data();

            i++;

            cvResize(frame,pSaveFrame,CV_INTER_LINEAR);

            cvSaveImage(chFilename,

                        pSaveFrame,

                        p);

            cvReleaseImage(&pSaveFrame);

            if(cvWaitKey(1)>0)

                break;

        }

        cvReleaseVideoWriter(&video);

        cvReleaseCapture(&capture);

        cvDestroyWindow("Camera Video");

    }

    return 0;

}