opecv2.3+directshow操作多个摄像头配置

1、  下载地directshow，http://download.csdn.net/download/yangalbert/4184472

2、  到opencv中文官网下载，http://www.opencv.org.cn/index.php/使用DirectShow采集图像其中的下载代码和例程

3、  配置opencv2.3

1 下载安装VS2010、OpenCV2.3，并解压缩OpenCV2.3，本处为D:\ProgramFiles\OpenCV2.3

2  配置VS2010,右键项目属性，其中vc目录添加

配置include路径：包含D:\Program Files\OpenCV2.3\build\include； D:\ProgramFiles\OpenCV2.3\build\include\opencv；D:\ProgramFiles\OpenCV2.3\build\include\opencv2

配置lib路径：

32位系统 &VC2010，库目录为：D:\Program Files\OpenCV2.3\build\x86\vc10\lib

3 设置环境变量

DLL：D:\ProgramFiles\OpenCV2.3\build\x86\vc10\bin

4 在项目属性 链接器 输入 附加依赖库 里加上

opencv_core230d.lib

opencv_highgui230d.lib

opencv_video230d.lib

opencv_ml230d.lib

opencv_legacy230d.lib

opencv_imgproc230d.lib

4、  配置directshow（可以将directshow拷贝到当前的工程下）

Project->Settings->Settingsfor:(All configurations)->C/C++->Category(Preprocessor)->Additionalinclude directories

设置为DirectShow/Include

Project->Settings->Settingsfor:(All configurations)->Link->Category(Input)->Additional librarydirectories

设置为DirectShow/Lib

 

5、 将opencv中文官网中下载的代码中的CameraDS.h、CameraDS.cpp复制到当前的工程中

6、运行下载代码中的main.cpp

 

//////////////////////////////////////////////////////////////////////+// Video Capture using DirectShow// Author: Shiqi Yu ([e-mail])// Thanks to://HardyAI@OpenCV China//flymanbox@OpenCV China (for his contribution to function CameraName, and frame width/height setting)// Last modification: April 9, 2009//// 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//////////////////////////////////////////////////////////////////////#include <stdio.h>#include "camerads.h"#include <highgui.h>const char *g_szTitle = "Camera";int main(){// 1、考虑到已经存在了显示图像的窗口，那就不必再次驱动摄像头了，即便往下驱动那也是摄像头已被占用。if(IsWindowVisible(FindWindow(NULL, g_szTitle))){return (-1);}//仅仅获取摄像头数目int m_iCamCount = CCameraDS::CameraCount();printf("There are %d cameras.\n", m_iCamCount);if(m_iCamCount == 0){return (-1);}CCameraDS m_CamDS;//获取所有摄像头的名称for(int i = 0; i < m_iCamCount; i++){char szCamName[1024];int retval = m_CamDS.CameraName(i, szCamName, sizeof(szCamName));if(retval >0){printf("Camera #%d's Name is '%s'.\n", i, szCamName);}else{printf("Can not get Camera #%d's name.\n", i);}}// 2、考虑到如果有多个摄像头，或者又有其中某个或某几个正在被其它程序占有，故需要逐个遍历，// 直到找到可用的为止。int m_iCamNum = 0; // 摄像头编号IplImage *pFrame = NULL;while(m_iCamNum < m_iCamCount){if((! m_CamDS.OpenCamera(m_iCamNum, false, 320, 240)) || ((pFrame = m_CamDS.QueryFrame()) == NULL)){m_iCamNum++;}else{ // 找到合适的摄像头，退出循环。break;}// 关闭摄像头，必须要关闭，因为即将要进行下一次的检测，检测前要清空当前的占用空间。m_CamDS.CloseCamera();}if(m_iCamNum == m_iCamCount){fprintf(stderr, "Can not open camera or is used by another app.\n");return (-1);}cvNamedWindow(g_szTitle);//显示cvShowImage(g_szTitle, pFrame);while(1){//获取一帧pFrame = m_CamDS.QueryFrame();//显示cvShowImage(g_szTitle, pFrame);if (cvWaitKey(20) == 'q'){break;}}m_CamDS.CloseCamera(); //可不调用此函数，CCameraDS析构时会自动关闭摄像头cvDestroyWindow(g_szTitle);return 0;}

配置过程出现的错误：

typedef void *PVOID;

typedef void * POINTER_64 PVOID64;

之前添加：

#define POINTER_64 __ptr64

否则在使用DirectShow会出现“ERROR：winnt.h error C2146:语法错误:缺少';'(在标识符'PVOID64'的前面)”的错误。

 

d:\my documents\visual studio 2010\projects\opencv_directshow\opencv_directshow\main.cpp

(28): error C2664: “FindWindowW”:不能将参数 2 从“const char *”转换为“LPCWSTR”

UNICODE问题，项目菜单->最后的属性->配置属性->常规->项目默认值->unicode改为未设置

对于这个问题也可以将const char*转换为LPCWSTR