使用VC CImage和DirectShow读取摄像头
在图像处理以及人脸识别时经常会用到从摄像头读取图像。OPENCV有提供的方法来实现，非常简单，不用多说。而使用VC++则没有那么容易，下面介绍使用CImage和DirectShow读取摄像头图像，并显示的对话框中。
我用的开发工具是VS2010。
源代码下载，使用VS2010编译通过。
http://download.csdn.net/detail/sdlypyzq/4087013
一、创建一个MFC对话框程序，工程起名为CameraVCTest。
二、删除无用的控件和按钮。添加一个图片控件，ID为IDC_PICTURE，并为其添加CStatic
类型变量m_picture。添加四个按钮，名称分别为预览，拍照，保存，关闭。ID分别为IDC_VIEW,IDC_TAKEPHOTO,IDC_SAVE,IDC_CLOSE。分别为其添加变量m_view,m_takePhoto,m_save,m_close。双击四个按钮，生成四个响应函数。
三、将DirectShow文件夹和CameraDS类的头文件和源文件拷贝到项目源文件夹下。并在项目属性VC++ Directories 添加include Directories，“.\Directory”。在Solution Exlporer添加上CameraDS类的头文件和源文件。
四、在CCameraVCTestDlg 类的头文件中，添加
| #include "CameraDS.h" #include <vector> using namespace std;
|
添加公共变量和方法
| vector<CCameraDS> cameralist; CImage *m_pImage; void ShowPicture(CImage *img,CStatic *pic); void SaveCard(CImage *img); int m_cam_count; bool isBreak;
CString m_savePath; CString savePath; int m_saveIndex; int m_fileCount;
|
在源文件的初始化函数里添加：
| m_cam_count = CCameraDS::CameraCount(); cameralist.resize(m_cam_count); if(! cameralist[m_cam_count-1].OpenCamera(m_cam_count-1, false, 640,480)) { return FALSE; } this->isBreak = false; this->isSave = false; this->m_view.EnableWindow(TRUE); this->m_takePhoto.EnableWindow(FALSE); this->m_save.EnableWindow(FALSE);
this->m_savePath = L".\\原-始º?照?片?\\"; this->m_saveIndex = 1001; this->m_fileCount = 0;
|
添加如下函数
|
void DoEvents1() { MSG msg; if (::PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { ::TranslateMessage(&msg); ::DispatchMessage(&msg); } }
void CCameraVCTestDlg::OnBnClickedView() { // TODO: Add your control notification handler code here
this->isBreak = false; this->m_view.EnableWindow(FALSE); this->m_takePhoto.EnableWindow(TRUE); this->m_save.EnableWindow(FALSE); if(m_cam_count==0) { return ; } //获?取¨?一°?帧? //CImage imgShow; //imgShow.Create(this->MAX_WIDTH,this->MAX_HEIGHT,24); while(1) { DoEvents1(); if(isBreak) { break; }
this->m_pImage = cameralist[m_cam_count-1].QueryFrame2(); //光a斑ã?补1偿£¤平?衡a //this->oper.RepairFaculaRGBImage(*m_pImage,this->m_imgBk,imgShow); //this->ShowPicture(&imgShow,&this->m_picture); this->ShowPicture(m_pImage,&this->m_picture);
//if(m_fileCount == 100) //{ // this->isBreak = true; // this->m_bnInit.EnableWindow(TRUE); // this->m_bnTake.EnableWindow(FALSE); // this->m_bnSave.EnableWindow(TRUE); // break; //} if(isSave) { if(this->m_fileCount<100) { //this->m_ctrlProg.SetPos(m_fileCount); CString path; path.Format(L"%s\\%d.jpg",savePath,m_fileCount+m_saveIndex); this->m_pImage->Save(path); m_fileCount++; } else { isSave = false; this->m_view.EnableWindow(FALSE); this->m_takePhoto.EnableWindow(TRUE); //this->m_save.EnableWindow(TRUE); }
} Sleep(150); } }
|
添加视频帧显示函数
|
void CCameraVCTestDlg::ShowPicture(CImage *img,CStatic *pic) { if(img==NULL) { return ; } ///////???????????? int width = img->GetWidth(); int height = img->GetHeight(); CRect picRect; this->m_picture.GetClientRect(&picRect); CRect rt(picRect); CDC* dc = this->m_picture.GetDC();
// if(this->isSaveCard == 1) // { CBrush *pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)); //dc->FillRect(rt, pBrush);
if(picRect.Height()*width > height*picRect.Width()) { CPoint p1(0,(picRect.Height()-(picRect.Width()*height/width))/2); CPoint p2(picRect.Width(),(picRect.Height() - p1.y)); rt.SetRect(p1,p2); } else { CPoint p1((picRect.Width()-(picRect.Height()*width/height))/2,0); CPoint p2(picRect.Width()-p1.x,picRect.Height()); rt.SetRect(p1,p2); } // }
// this->ShowMouseCursor(CursorTag); ::SetStretchBltMode(dc->m_hDC,HALFTONE); img->Draw(dc->m_hDC, rt); }
|
添加关闭程序
| void CCameraVCTestDlg::OnBnClickedClose() { // TODO: Add your control notification handler code here //结¨¢束º?从䨮摄¦?像?头ª¡¤中D读¨¢取¨?视º¨®频¦Ì，ê?关?闭À?程¨¬序¨° this->isBreak = true; this->OnClose(); }
|
好了，现在对话框上，点击预览按钮，就可以打开摄像头了，若还需要什么功能自己添加吧，如有问题，可以一起交流。欢迎不吝赐教。
Camera.h
#ifndef POINTER_64
#if !defined(_MAC) && (defined(_M_MRX000) || defined(_M_AMD64) || defined(_M_IA64)) && (_MSC_VER >= 1100) && !(defined(MIDL_PASS) || defined(RC_INVOKED))
#define POINTER_64 __ptr64
typedef unsigned __int64 POINTER_64_INT;
#if defined(_WIN64)
#define POINTER_32 __ptr32
#else
#define POINTER_32
#endif
#else
#if defined(_MAC) && defined(_MAC_INT_64)
#define POINTER_64 __ptr64
typedef unsigned __int64 POINTER_64_INT;
#else
#if (_MSC_VER >= 1300) && !(defined(MIDL_PASS) || defined(RC_INVOKED))
#define POINTER_64 __ptr64
#else
#define POINTER_64
#endif
typedef unsigned long POINTER_64_INT;
#endif
#define POINTER_32
#endif
#endif
#ifndef CCAMERA_H
#define CCAMERA_H
#define WIN32_LEAN_AND_MEAN
#include <atlbase.h>
#include "qedit.h"
#include "dshow.h"
#include <windows.h>
//#include "cv.h"
//#include <cxcore.h>
#define MYFREEMEDIATYPE(mt) {if ((mt).cbFormat != 0) \
{CoTaskMemFree((PVOID)(mt).pbFormat); \
(mt).cbFormat =0; \
(mt).pbFormat = NULL; \
} \
if ((mt).pUnk != NULL) \
{ \
(mt).pUnk->Release(); \
(mt).pUnk = NULL; \
}}
class CCameraDS
{
private:
// IplImage * m_pFrame;
CImage m_image;
bool m_bConnected;
int m_nWidth;
int m_nHeight;
bool m_bLock;
bool m_bChanged;
long m_nBufferSize;
CComPtr<IGraphBuilder> m_pGraph;
CComPtr<IBaseFilter> m_pDeviceFilter;
CComPtr<IMediaControl> m_pMediaControl;
CComPtr<IBaseFilter> m_pSampleGrabberFilter;
CComPtr<ISampleGrabber> m_pSampleGrabber;
CComPtr<IPin> m_pGrabberInput;
CComPtr<IPin> m_pGrabberOutput;
CComPtr<IPin> m_pCameraOutput;
CComPtr<IMediaEvent> m_pMediaEvent;
CComPtr<IBaseFilter> m_pNullFilter;
CComPtr<IPin> m_pNullInputPin;
private:
bool BindFilter(int nCamIDX, IBaseFilter **pFilter);
void SetCrossBar();
public:
CCameraDS();
virtual~CCameraDS();
//打开摄像头，nCamID指定打开哪个摄像头，取值可以为0,1,2,...
//bDisplayProperties指示是否自动弹出摄像头属性页
//nWidth和nHeight设置的摄像头的宽和高，如果摄像头不支持所设定的宽度和高度，则返回false
bool CCameraDS::OpenCamera(int nCamID, bool bDisplayProperties=true, int nWidth =320, int nHeight =240);
//关闭摄像头，析构函数会自动调用这个函数
void CloseCamera();
//返回摄像头的数目
//可以不用创建CCameraDS实例，采用int c=CCameraDS::CameraCount();得到结果。
staticint CameraCount();
//根据摄像头的编号返回摄像头的名字
//nCamID: 摄像头编号
//sName: 用于存放摄像头名字的数组
//nBufferSize: sName的大小
//可以不用创建CCameraDS实例，采用CCameraDS::CameraName();得到结果。
staticint CCameraDS::CameraName(int nCamID, char* sName, int nBufferSize);
//返回图像宽度
int GetWidth(){return m_nWidth;}
//返回图像高度
int GetHeight(){return m_nHeight;}
//抓取一帧，返回的IplImage不可手动释放！
//返回图像数据的为RGB模式的Top-down(第一个字节为左上角像素)，即IplImage::origin=0(IPL_ORIGIN_TL)
// IplImage * QueryFrame();
CImage* QueryFrame2();
};
#endif
camera.cpp
#include "stdafx.h"
#include "CameraDS.h"
#pragma comment(lib,"Strmiids.lib")
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CCameraDS::CCameraDS()
{
m_bConnected =false;
m_nWidth =0;
m_nHeight =0;
m_bLock =false;
m_bChanged =false;
// m_pFrame = NULL;
m_nBufferSize =0;
m_pNullFilter = NULL;
m_pMediaEvent = NULL;
m_pSampleGrabberFilter = NULL;
m_pGraph = NULL;
CoInitialize(NULL);
}
CCameraDS::~CCameraDS()
{
CloseCamera();
CoUninitialize();
}
void CCameraDS::CloseCamera()
{
if(m_bConnected)
m_pMediaControl->Stop();
m_pGraph = NULL;
m_pDeviceFilter = NULL;
m_pMediaControl = NULL;
m_pSampleGrabberFilter = NULL;
m_pSampleGrabber = NULL;
m_pGrabberInput = NULL;
m_pGrabberOutput = NULL;
m_pCameraOutput = NULL;
m_pMediaEvent = NULL;
m_pNullFilter = NULL;
m_pNullInputPin = NULL;
//if (m_pFrame)
// cvReleaseImage(&m_pFrame);
if(!this->m_image.IsNull())
{
this->m_image.Destroy();
}
m_bConnected =false;
m_nWidth =0;
m_nHeight =0;
m_bLock =false;
m_bChanged =false;
m_nBufferSize =0;
}
bool CCameraDS::OpenCamera(int nCamID, bool bDisplayProperties, int nWidth, int nHeight)
{
HRESULT hr = S_OK;
CoInitialize(NULL);
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,
IID_IGraphBuilder, (void**)&m_pGraph);
hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID *)&m_pSampleGrabberFilter);
hr = m_pGraph->QueryInterface(IID_IMediaControl, (void**) &m_pMediaControl);
hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void**) &m_pMediaEvent);
hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID*) &m_pNullFilter);
hr = m_pGraph->AddFilter(m_pNullFilter, L"NullRenderer");
hr = m_pSampleGrabberFilter->QueryInterface(IID_ISampleGrabber, (void**)&m_pSampleGrabber);
AM_MEDIA_TYPE mt;
ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
mt.majortype = MEDIATYPE_Video;
mt.subtype = MEDIASUBTYPE_RGB24;
mt.formattype = FORMAT_VideoInfo;
hr = m_pSampleGrabber->SetMediaType(&mt);
MYFREEMEDIATYPE(mt);
m_pGraph->AddFilter(m_pSampleGrabberFilter, L"Grabber");
// Bind Device Filter. We know the device because the id was passed in
BindFilter(nCamID, &m_pDeviceFilter);
m_pGraph->AddFilter(m_pDeviceFilter, NULL);
CComPtr<IEnumPins> pEnum;
m_pDeviceFilter->EnumPins(&pEnum);
hr = pEnum->Reset();
hr = pEnum->Next(1, &m_pCameraOutput, NULL);
pEnum = NULL;
m_pSampleGrabberFilter->EnumPins(&pEnum);
pEnum->Reset();
hr = pEnum->Next(1, &m_pGrabberInput, NULL);
pEnum = NULL;
m_pSampleGrabberFilter->EnumPins(&pEnum);
pEnum->Reset();
pEnum->Skip(1);
hr = pEnum->Next(1, &m_pGrabberOutput, NULL);
pEnum = NULL;
m_pNullFilter->EnumPins(&pEnum);
pEnum->Reset();
hr = pEnum->Next(1, &m_pNullInputPin, NULL);
//SetCrossBar();
if (bDisplayProperties)
{
CComPtr<ISpecifyPropertyPages> pPages;
HRESULT hr = m_pCameraOutput->QueryInterface(IID_ISpecifyPropertyPages, (void**)&pPages);
if (SUCCEEDED(hr))
{
PIN_INFO PinInfo;
m_pCameraOutput->QueryPinInfo(&PinInfo);
CAUUID caGUID;
pPages->GetPages(&caGUID);
OleCreatePropertyFrame(NULL, 0, 0,
L"Property Sheet", 1,
(IUnknown **)&(m_pCameraOutput.p),
caGUID.cElems,
caGUID.pElems,
, 0, NULL);
CoTaskMemFree(caGUID.pElems);
PinInfo.pFilter->Release();
}
pPages = NULL;
}
else
{
//////////////////////////////////////////////////////////////////////////////
// 加入由 lWidth和lHeight设置的摄像头的宽和高 的功能，默认320*240
// by flymanbox @2009-01-24
//////////////////////////////////////////////////////////////////////////////
int _Width = nWidth, _Height = nHeight;
IAMStreamConfig* iconfig;
iconfig = NULL;
hr = m_pCameraOutput->QueryInterface(IID_IAMStreamConfig, (void**)&iconfig);
AM_MEDIA_TYPE* pmt;
if(iconfig->GetFormat(&pmt) !=S_OK)
{
//printf("GetFormat Failed ! \n");
returnfalse;
}
VIDEOINFOHEADER* phead;
if ( pmt->formattype == FORMAT_VideoInfo)
{
phead=( VIDEOINFOHEADER*)pmt->pbFormat;
phead->bmiHeader.biWidth = _Width;
phead->bmiHeader.biHeight = _Height;
if(( hr=iconfig->SetFormat(pmt)) != S_OK )
{
returnfalse;
}
}
iconfig->Release();
iconfig=NULL;
MYFREEMEDIATYPE(*pmt);
}
hr = m_pGraph->Connect(m_pCameraOutput, m_pGrabberInput);
hr = m_pGraph->Connect(m_pGrabberOutput, m_pNullInputPin);
if (FAILED(hr))
{
switch(hr)
{
case VFW_S_NOPREVIEWPIN :
break;
case E_FAIL :
break;
case E_INVALIDARG :
break;
case E_POINTER :
break;
}
}
m_pSampleGrabber->SetBufferSamples(TRUE);
m_pSampleGrabber->SetOneShot(TRUE);
hr = m_pSampleGrabber->GetConnectedMediaType(&mt);
if(FAILED(hr))
returnfalse;
VIDEOINFOHEADER *videoHeader;
videoHeader = reinterpret_cast<VIDEOINFOHEADER*>(mt.pbFormat);
m_nWidth = videoHeader->bmiHeader.biWidth;
m_nHeight = videoHeader->bmiHeader.biHeight;
m_bConnected =true;
pEnum = NULL;
returntrue;
}
#include "stdafx.h"
#include "CameraDS.h"
#pragma comment(lib,"Strmiids.lib")
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CCameraDS::CCameraDS()
{
m_bConnected =false;
m_nWidth =0;
m_nHeight =0;
m_bLock =false;
m_bChanged =false;
// m_pFrame = NULL;
m_nBufferSize =0;
m_pNullFilter = NULL;
m_pMediaEvent = NULL;
m_pSampleGrabberFilter = NULL;
m_pGraph = NULL;
CoInitialize(NULL);
}
CCameraDS::~CCameraDS()
{
CloseCamera();
CoUninitialize();
}
void CCameraDS::CloseCamera()
{
if(m_bConnected)
m_pMediaControl->Stop();
m_pGraph = NULL;
m_pDeviceFilter = NULL;
m_pMediaControl = NULL;
m_pSampleGrabberFilter = NULL;
m_pSampleGrabber = NULL;
m_pGrabberInput = NULL;
m_pGrabberOutput = NULL;
m_pCameraOutput = NULL;
m_pMediaEvent = NULL;
m_pNullFilter = NULL;
m_pNullInputPin = NULL;
//if (m_pFrame)
// cvReleaseImage(&m_pFrame);
if(!this->m_image.IsNull())
{
this->m_image.Destroy();
}
m_bConnected =false;
m_nWidth =0;
m_nHeight =0;
m_bLock =false;
m_bChanged =false;
m_nBufferSize =0;
}
bool CCameraDS::OpenCamera(int nCamID, bool bDisplayProperties, int nWidth, int nHeight)
{
HRESULT hr = S_OK;
CoInitialize(NULL);
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,
IID_IGraphBuilder, (void**)&m_pGraph);
hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID *)&m_pSampleGrabberFilter);
hr = m_pGraph->QueryInterface(IID_IMediaControl, (void**) &m_pMediaControl);
hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void**) &m_pMediaEvent);
hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (LPVOID*) &m_pNullFilter);
hr = m_pGraph->AddFilter(m_pNullFilter, L"NullRenderer");
hr = m_pSampleGrabberFilter->QueryInterface(IID_ISampleGrabber, (void**)&m_pSampleGrabber);
AM_MEDIA_TYPE mt;
ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
mt.majortype = MEDIATYPE_Video;
mt.subtype = MEDIASUBTYPE_RGB24;
mt.formattype = FORMAT_VideoInfo;
hr = m_pSampleGrabber->SetMediaType(&mt);
MYFREEMEDIATYPE(mt);
m_pGraph->AddFilter(m_pSampleGrabberFilter, L"Grabber");
// Bind Device Filter. We know the device because the id was passed in
BindFilter(nCamID, &m_pDeviceFilter);
m_pGraph->AddFilter(m_pDeviceFilter, NULL);
CComPtr<IEnumPins> pEnum;
m_pDeviceFilter->EnumPins(&pEnum);
hr = pEnum->Reset();
hr = pEnum->Next(1, &m_pCameraOutput, NULL);
pEnum = NULL;
m_pSampleGrabberFilter->EnumPins(&pEnum);
pEnum->Reset();
hr = pEnum->Next(1, &m_pGrabberInput, NULL);
pEnum = NULL;
m_pSampleGrabberFilter->EnumPins(&pEnum);
pEnum->Reset();
pEnum->Skip(1);
hr = pEnum->Next(1, &m_pGrabberOutput, NULL);
pEnum = NULL;
m_pNullFilter->EnumPins(&pEnum);
pEnum->Reset();
hr = pEnum->Next(1, &m_pNullInputPin, NULL);
//SetCrossBar();
if (bDisplayProperties)
{
CComPtr<ISpecifyPropertyPages> pPages;
HRESULT hr = m_pCameraOutput->QueryInterface(IID_ISpecifyPropertyPages, (void**)&pPages);
if (SUCCEEDED(hr))
{
PIN_INFO PinInfo;
m_pCameraOutput->QueryPinInfo(&PinInfo);
CAUUID caGUID;
pPages->GetPages(&caGUID);
OleCreatePropertyFrame(NULL, 0, 0,
L"Property Sheet", 1,
(IUnknown **)&(m_pCameraOutput.p),
caGUID.cElems,
caGUID.pElems,
, 0, NULL);
CoTaskMemFree(caGUID.pElems);
PinInfo.pFilter->Release();
}
pPages = NULL;
}
else
{
//////////////////////////////////////////////////////////////////////////////
// 加入由 lWidth和lHeight设置的摄像头的宽和高 的功能，默认320*240
// by flymanbox @2009-01-24
//////////////////////////////////////////////////////////////////////////////
int _Width = nWidth, _Height = nHeight;
IAMStreamConfig* iconfig;
iconfig = NULL;
hr = m_pCameraOutput->QueryInterface(IID_IAMStreamConfig, (void**)&iconfig);
AM_MEDIA_TYPE* pmt;
if(iconfig->GetFormat(&pmt) !=S_OK)
{
//printf("GetFormat Failed ! \n");
returnfalse;
}
VIDEOINFOHEADER* phead;
if ( pmt->formattype == FORMAT_VideoInfo)
{
phead=( VIDEOINFOHEADER*)pmt->pbFormat;
phead->bmiHeader.biWidth = _Width;
phead->bmiHeader.biHeight = _Height;
if(( hr=iconfig->SetFormat(pmt)) != S_OK )
{
returnfalse;
}
}
iconfig->Release();
iconfig=NULL;
MYFREEMEDIATYPE(*pmt);
}
hr = m_pGraph->Connect(m_pCameraOutput, m_pGrabberInput);
hr = m_pGraph->Connect(m_pGrabberOutput, m_pNullInputPin);
if (FAILED(hr))
{
switch(hr)
{
case VFW_S_NOPREVIEWPIN :
break;
case E_FAIL :
break;
case E_INVALIDARG :
break;
case E_POINTER :
break;
}
}
m_pSampleGrabber->SetBufferSamples(TRUE);
m_pSampleGrabber->SetOneShot(TRUE);
hr = m_pSampleGrabber->GetConnectedMediaType(&mt);
if(FAILED(hr))
returnfalse;
VIDEOINFOHEADER *videoHeader;
videoHeader = reinterpret_cast<VIDEOINFOHEADER*>(mt.pbFormat);
m_nWidth = videoHeader->bmiHeader.biWidth;
m_nHeight = videoHeader->bmiHeader.biHeight;
m_bConnected =true;
pEnum = NULL;
returntrue;
}
专题： http://www.cnblogs.com/sdlypyzq/archive/2011/08/13/CameraVCTest.html