多个摄像头同步工作【转】

#include "stdafx.h"

#include <cv.h>
#include <cxcore.h>
#include <highgui.h>

int main(int argc, _TCHAR* argv[])
{
    CvCapture* capture1 = cvCreateCameraCapture( 0 );
    CvCapture* capture2 = cvCreateCameraCapture( 1 );

    double w = 320, h = 240;
    cvSetCaptureProperty ( capture1, CV_CAP_PROP_FRAME_WIDTH,  w );  
    cvSetCaptureProperty ( capture1, CV_CAP_PROP_FRAME_HEIGHT, h );
    cvSetCaptureProperty ( capture2, CV_CAP_PROP_FRAME_WIDTH,  w );  
    cvSetCaptureProperty ( capture2, CV_CAP_PROP_FRAME_HEIGHT, h );

    cvNamedWindow( "Camera_1", CV_WINDOW_AUTOSIZE );
    cvNamedWindow( "Camera_2", CV_WINDOW_AUTOSIZE );

    IplImage* frame1;
    IplImage* frame2;

    int n = 2;
    while(1)
    {
        frame1 = cvQueryFrame( capture1 );
        if( !frame1 ) break;
        cvShowImage( "Camera_1", frame1 );

        frame2 = cvQueryFrame( capture2 );
        if( !frame2 ) break;
        cvShowImage( "Camera_2", frame2 );

        int key = cvWaitKey(30);
        if( key == 27 ) break;
    }
    cvReleaseCapture( &capture1 );
    cvReleaseCapture( &capture2 );
    cvDestroyWindow( "Camera_1" );
    cvDestroyWindow( "Camera_2" );

    return 0;
}

/*
Begin work with cvcam, you can select single or multiple cameras in 2 ways. 
The first is using a camera selection dialog with cvcamSelectCamera. See an example below: 
*/ 

//Prototype 
/*
Pops up a camera(s) selection dialog 
Return value - number of cameras selected (0,1 or 2); 
Argument: an array of selected cameras numbers 
NULL if none selected. Should be released with free() when not needed. 
if NULL passed, not used. 
*/ 
CVCAM_API int cvcamSelectCamera(int** out); 
Function ThatSelectsCamera() 
{ 
 int* out; 
 int nselected = cvcamSelectCamera(&out); 
 if(nselected>0) 
    printf("the 1-st selected camera is camera number %d", out[0]); 
 if(nselected == 2) 
    printf("the 2-nd selected camera is camera number %d", out[1]); 
 free(out); 
 return; 
} 

/*
Note: if you don’t need selected cameras numbers, simply call cvcamSelectCamera(NULL) 
Note2: Linux version of cvcam currently has no implementation of cvcamSelectCamera. 
*/

//The second, non-dialog way is to use CVCAM_PROP_ENABLE property like this:
int desiredcamera = 0;//for example cvcamSetProperty(desiredcamera, CVCAM_PROP_ENABLE,CVCAMTRUE); 

#include <cvcam.h>
#include <cv.h>
#include <highgui.h>
#include "stdio.h"
#include <windows.h>

void StereoCallback(IplImage *frame1,IplImage *frame2);
void onMouse(int Event,int x,int y,int flags,void *param);

IplImage *image1,*image2;

char *strleft[4]={"left1.bmp","left2.bmp","left3.bmp","left4.bmp"};
char *strright[4]={"right1.bmp","right2.bmp","right3.bmp","right4.bmp"};

void main()
{
    HWND CaptureWindow1=0;
    HWND CaptureWindow2=0;
    

//int ncams=cvcamGetCamerasCount(); //获取摄像头的个数
//用对话框的形式来选取摄像头    int *CameraNumber;
    int nSelected = cvcamSelectCamera(&CameraNumber);

/* //灰色图像
    image1=cvCreateImage(cvSize(320,240),IPL_DEPTH_8U,1);
    image2=cvCreateImage(cvSize(320,240),IPL_DEPTH_8U,1);
*/

//彩色图像    image1=cvCreateImage(cvSize(320,240),IPL_DEPTH_8U,3);
    image2=cvCreateImage(cvSize(320,240),IPL_DEPTH_8U,3);

//初始化两个摄像头        cvNamedWindow("cvcam1 Window",1);
        CaptureWindow1=(HWND)cvGetWindowHandle("cvcam1 Window");
        cvcamSetProperty(CameraNumber[0], CVCAM_PROP_ENABLE, CVCAMTRUE);
        cvcamSetProperty(CameraNumber[0], CVCAM_PROP_RENDER, CVCAMTRUE);
        cvcamSetProperty(CameraNumber[0], CVCAM_PROP_WINDOW, &CaptureWindow1);
        cvSetMouseCallback("cvcam1 Window",onMouse,0);
    
        cvNamedWindow("cvcam2 Window",1);
        CaptureWindow2=(HWND)cvGetWindowHandle("cvcam2 Window");
        cvcamSetProperty(CameraNumber[1], CVCAM_PROP_ENABLE, CVCAMTRUE);
        cvcamSetProperty(CameraNumber[1], CVCAM_PROP_RENDER, CVCAMTRUE);
        cvcamSetProperty(CameraNumber[1], CVCAM_PROP_WINDOW, &CaptureWindow2);

//让两个摄像头同步            cvcamSetProperty(CameraNumber[0], CVCAM_STEREO_CALLBACK,(void *)&StereoCallback);    

//启动程序    cvcamInit();
    cvcamStart();
    cvWaitKey(0);

    cvcamStop();
    cvcamExit();
    free(CameraNumber);
    cvDestroyWindow("cvcam1 Window");
    cvDestroyWindow("cvcam2 Window");
}

void StereoCallback(IplImage* frame1,IplImage *frame2)
{
/*   //把图像转换成灰度图并保存到image中
    cvCvtColor(frame1,image1,CV_RGB2GRAY);
    cvCvtColor(frame2,image2,CV_RGB2GRAY);
    */

//拷贝图像到全局变量image中 该函数这样用存在问题     cvCopy(frame1,image1);
    cvCopy(frame2,image2);
//    image1=cvCloneImage(frame1);
//    image2=cvCloneImage(frame2);
    //对截取的图像翻转    cvFlip(image1,image1,0);
    cvFlip(image2,image2,0);
}

void onMouse(int Event,int x,int y,int flags,void *param)
{    
    static int num=0;
        if(Event==CV_EVENT_LBUTTONDOWN)
        {
        if(num==4)num=0;//只是固定定义了保存4张图片，为了不让程序非法而设置的复原            cvcamPause();
            //图像保存        cvSaveImage(strleft[num],image1);    
        cvSaveImage(strright[num],image2);
        //    cvSaveImage("left.bmp",image1);
        //    cvSaveImage("right.bmp",image2);
        }
        if(Event==CV_EVENT_RBUTTONDOWN)
        {
            cvcamResume();
            num++;
        }        
}

//////////////////////////////////////////////////////////////////////// Multiple Cameras Capture using DirectShow
// Author: Yuhua Zou
// Thanks to:
//      Shiqi Yu (shiqi.yu@gmail.com)
//        HardyAI@OpenCV China
//        flymanbox@OpenCV China (for his contribution to function CameraName, and frame width/height setting)
// Last modification: October 8, 2009//////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////// 使用说明：
//  在 VC6 开发环境下的使用说明：
//   1. 将CameraDS.h CameraDS.cpp以及目录DirectShow复制到你的项目中
//   2. 菜单 Project->Settings->Settings for:(All configurations)->C/C++->Category(Preprocessor)->Additional include directories
//      设置为 DirectShow/Include
//   3. 菜单 Project->Settings->Settings for:(All configurations)->Link->Category(Input)->Additional library directories
//      设置为 DirectShow/Lib
//  在 VS2005/2008 开发环境下的使用说明：
//   1. 将CameraDS.h CameraDS.cpp复制到你的项目中
//   2. 将DirectShow复制到你的opencv根目录下，菜单 工具->选项->项目和解决方案->vc++目录，把..(你的opencv安装目录)/DirectShow/Include添加到
//     “引用文件”中$(VCInstallDir)PlatformSDK/include和$(FrameworkSDKDir)include下面任意位置
//   3. 菜单 工具->选项->项目和解决方案->vc++目录，把..(你的opencv安装目录)/DirectShow/Lib添加到“库文件”下面。也可参考使用说明3。//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "camerads.h"
#include <cv.h>
#include <cxcore.h>
#include <highgui.h>
#include <stdio.h>
#include <stdarg.h>
#include <time.h>

// 单窗口显示多幅图像的函数void cvShowMultiImages(char* title, int nArgs, ...) 
{
   // 略，详见学习笔记（5）}


int main( int argc, char** argv ) 
{
    int cam_count;

    //仅仅获取摄像头数目    cam_count = CCameraDS::CameraCount();
    printf("There are %d cameras./n", cam_count);


    //获取所有摄像头的名称    for(int i=0; i < cam_count; i++)
    {
        char camera_name[1024];  
        int retval = CCameraDS::CameraName(i, camera_name, sizeof(camera_name) );

        if(retval >0)
            printf("Camera #%d‘s Name is ‘%s‘./n", i, camera_name);
        else
            printf("Can not get Camera #%d‘s name./n", i);
    }

    if(cam_count==0)
        return -1;

    // 创建2个摄像头类    CCameraDS camera1;
    CCameraDS camera2;    
    
    //打开第一个摄像头
    //if(! camera.OpenCamera(0, true)) //弹出属性选择窗口    if(! camera1.OpenCamera(0, false, 320,240)) //不弹出属性选择窗口，用代码制定图像宽和高    {
        fprintf(stderr, "Can not open camera./n");
        return -1;
    }
    //打开第二个摄像头    camera2.OpenCamera(1, false, 320,240);
    
    
    cvNamedWindow("Multiple Cameras");

    // 初始化在子图像中显示字符的字体格式    CvFont tFont;
    cvInitFont(&tFont,  CV_FONT_HERSHEY_COMPLEX, 0.5f,0.7f,0,1,8);
   
    char cam1str[] = "Camera #1";
    char cam2str[] = "Camera #2";

    // 为读取系统时间信息分配内存    char timestr[25];
    memset(timestr, 0, 25 * sizeof(char));   
    
    while(1)
    {
        //获取一帧        IplImage *pFrame1 = camera1.QueryFrame();
        IplImage *pFrame2 = camera2.QueryFrame();
        
        // 获取当前帧的灰度图        IplImage* frame_gray_1 = cvCreateImage(cvGetSize(pFrame1),pFrame1->depth,1);
        IplImage* frame_gray_2 = cvCreateImage(cvGetSize(pFrame2),pFrame2->depth,1);
        cvCvtColor(pFrame1,frame_gray_1,CV_RGB2GRAY);
        cvCvtColor(pFrame2,frame_gray_2,CV_RGB2GRAY);
      
        // 对灰度图像进行Canny边缘检测
        // 然后将图像通道数改为三通道        IplImage* frame_canny_1 = cvCreateImage(cvGetSize(pFrame1),pFrame1->depth,1);
        IplImage* frame_canny_2 = cvCreateImage(cvGetSize(pFrame2),pFrame2->depth,1);
        IplImage* frame1 = cvCreateImage(cvGetSize(pFrame1),pFrame1->depth,pFrame1->nChannels);
        IplImage* frame2 = cvCreateImage(cvGetSize(pFrame2),pFrame2->depth,pFrame2->nChannels);
        cvCanny(frame_gray_1,frame_canny_1,20,75,3);
        cvCanny(frame_gray_2,frame_canny_2,20,75,3);
        cvCvtColor(frame_canny_1,frame1,CV_GRAY2BGR);
        cvCvtColor(frame_canny_2,frame2,CV_GRAY2BGR);

        
        // 获取系统时间信息        time_t rawtime; 
        struct tm* timeinfo; 

        rawtime = time( NULL ); 
        timeinfo = localtime( &rawtime ); 
        char* p = asctime( timeinfo );
      
        // 字符串 p 的第25个字符是换行符 ‘/n‘
        // 但在子图像中将乱码显示
        // 故仅读取 p 的前 24 个字符        for (int i = 0; i < 24; i++)
        {
            timestr[i] = *p;
            p++;
        }
        p = NULL;
        
        // 在每个子图像上显示摄像头序号以及系统时间信息        cvPutText( pFrame1, cam1str, cvPoint(95,15), &tFont,  CV_RGB(255,0,0) );
        cvPutText( pFrame2, cam2str, cvPoint(95,15), &tFont,  CV_RGB(255,0,0) );
        cvPutText( frame1,  cam1str, cvPoint(95,15), &tFont,  CV_RGB(255,0,0) );
        cvPutText( frame2,  cam2str, cvPoint(95,15), &tFont,  CV_RGB(255,0,0) );

        cvPutText( pFrame1, timestr, cvPoint(5,225), &tFont,  CV_RGB(255,0,0) );
        cvPutText( pFrame2, timestr, cvPoint(5,225), &tFont,  CV_RGB(255,0,0) );
        cvPutText( frame1,  timestr, cvPoint(5,225), &tFont,  CV_RGB(255,0,0) );
        cvPutText( frame2,  timestr, cvPoint(5,225), &tFont,  CV_RGB(255,0,0) );
        
        // 显示实时的摄像头视频        cvShowMultiImages( "Multiple Cameras", 4, pFrame1, pFrame2, frame1, frame2 );

      
        //cvWaitKey(33);        int key = cvWaitKey(33);
        if( key == 27 ) break;

        cvReleaseImage(&frame1);
        cvReleaseImage(&frame2);
        cvReleaseImage(&frame_gray_1);
        cvReleaseImage(&frame_gray_2);
        cvReleaseImage(&frame_canny_1);  
        cvReleaseImage(&frame_canny_2); 
    }
    
    camera1.CloseCamera(); //可不调用此函数，CCameraDS析构时会自动关闭摄像头    camera2.CloseCamera();

    cvDestroyWindow("Multiple Cameras");

    return 0;
}