vc++ MFC opencv 显示摄像头图像的2种方法

1.通过 vvimage 类显示到MFC控件中

参考

opencv -- cvvimage 的使用 opencv2.1后版本

Cvvimage.h 文件

#pragma once
#ifndef CVVIMAGE_CLASS_DEF
#define CVVIMAGE_CLASS_DEF
#include "opencv.hpp"
#include <windows.h>
/* CvvImage class definition */
class  CvvImage
{
public:
   CvvImage();
   virtual ~CvvImage();
   /* Create image (BGR or grayscale) */
   virtual bool  Create( int width, int height, int bits_per_pixel, int image_origin = 0 );
   /* Load image from specified file */
   virtual bool  Load( const char* filename, int desired_color = 1 );
   /* Load rectangle from the file */
   virtual bool  LoadRect( const char* filename,
      int desired_color, CvRect r );
#if defined WIN32 || defined _WIN32
   virtual bool  LoadRect( const char* filename,
      int desired_color, RECT r )
   {
      return LoadRect( filename, desired_color,
         cvRect( r.left, r.top, r.right - r.left, r.bottom - r.top ));
   }
#endif
   /* Save entire image to specified file. */
   virtual bool  Save( const char* filename );
   /* Get copy of input image ROI */
   virtual void  CopyOf( CvvImage& image, int desired_color = -1 );
   virtual void  CopyOf( IplImage* img, int desired_color = -1 );
   IplImage* GetImage() { return m_img; };
   virtual void  Destroy(void);
   /* width and height of ROI */
   int Width() { return !m_img ? 0 : !m_img->roi ? m_img->width : m_img->roi->width; };
   int Height() { return !m_img ? 0 : !m_img->roi ? m_img->height : m_img->roi->height;};
   int Bpp() { return m_img ? (m_img->depth & 255)*m_img->nChannels : 0; };
   virtual void  Fill( int color );
   /* draw to highgui window */
   virtual void  Show( const char* window );
 
#if defined WIN32 || defined _WIN32
   /* draw part of image to the specified DC */
   virtual void  Show( HDC dc, int x, int y, int width, int height,
      int from_x = 0, int from_y = 0 );
   /* draw the current image ROI to the specified rectangle of the destination DC */
   virtual void  DrawToHDC( HDC hDCDst, RECT* pDstRect );
#endif
protected:
   IplImage*  m_img;
};
typedef CvvImage CImage;
#endif

Cvvimage.cpp文件

#include "StdAfx.h"
#include "CvvImage.h"
//
// Construction/Destruction
//
CV_INLINE RECT NormalizeRect( RECT r );
CV_INLINE RECT NormalizeRect( RECT r )
{
   int t;
   if( r.left > r.right )
   {
      t = r.left;
      r.left = r.right;
      r.right = t;
   }
   if( r.top > r.bottom )
   {
      t = r.top;
      r.top = r.bottom;
      r.bottom = t;
   }
 
   return r;
}
CV_INLINE CvRect RectToCvRect( RECT sr );
CV_INLINE CvRect RectToCvRect( RECT sr )
{
   sr = NormalizeRect( sr );
   return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );
}
CV_INLINE RECT CvRectToRect( CvRect sr );
CV_INLINE RECT CvRectToRect( CvRect sr )
{
   RECT dr;
   dr.left = sr.x;
   dr.top = sr.y;
   dr.right = sr.x + sr.width;
   dr.bottom = sr.y + sr.height;
 
   return dr;
}
CV_INLINE IplROI RectToROI( RECT r );
CV_INLINE IplROI RectToROI( RECT r )
{
   IplROI roi;
   r = NormalizeRect( r );
   roi.xOffset = r.left;
   roi.yOffset = r.top;
   roi.width = r.right - r.left;
   roi.height = r.bottom - r.top;
   roi.coi = 0;
 
   return roi;
}
void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin )
{
   assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));
 
   BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);
 
   memset( bmih, 0, sizeof(*bmih));
   bmih->biSize = sizeof(BITMAPINFOHEADER);
   bmih->biWidth = width;
   bmih->biHeight = origin ? abs(height) : -abs(height);
   bmih->biPlanes = 1;
   bmih->biBitCount = (unsigned short)bpp;
   bmih->biCompression = BI_RGB;
   if( bpp == 8 )
   {
      RGBQUAD* palette = bmi->bmiColors;
      int i;
      for( i = 0; i < 256; i++ )
      {
         palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;
         palette[i].rgbReserved = 0;
      }
   }
}
CvvImage::CvvImage()
{
   m_img = 0;
}
void CvvImage::Destroy()
{
   cvReleaseImage( &m_img );
}
CvvImage::~CvvImage()
{
   Destroy();
}
bool  CvvImage::Create( int w, int h, int bpp, int origin )
{
   const unsigned max_img_size = 10000;
 
   if( (bpp != 8 && bpp != 24 && bpp != 32) ||
      (unsigned)w >=  max_img_size || (unsigned)h >= max_img_size ||
      (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL))
   {
      assert(0); // most probably, it is a programming error
      return false;
   }
   if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h )
   {
      if( m_img && m_img->nSize == sizeof(IplImage))
         Destroy();
      /* prepare IPL header */
      m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 );
   }
   if( m_img )
      m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;
   return m_img != 0;
}
void  CvvImage::CopyOf( CvvImage& image, int desired_color )
{
   IplImage* img = image.GetImage();
   if( img )
   {
      CopyOf( img, desired_color );
   }
}
#define HG_IS_IMAGE(img)                                                  
   ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && 
   ((IplImage*)img)->imageData != 0)
void  CvvImage::CopyOf( IplImage* img, int desired_color )
{
   if( HG_IS_IMAGE(img) )
   {
      int color = desired_color;
      CvSize size = cvGetSize( img ); 
      if( color < 0 )
         color = img->nChannels > 1;
      if( Create( size.width, size.height,
         (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8,
         img->origin ))
      {
         cvConvertImage( img, m_img, 0 );
      }
   }
}
bool  CvvImage::Load( const char* filename, int desired_color )
{
   IplImage* img = cvLoadImage( filename, desired_color );
   if( !img )
      return false;
 
   CopyOf( img, desired_color );
   cvReleaseImage( &img );
 
   return true;
}
bool  CvvImage::LoadRect( const char* filename,
                   int desired_color, CvRect r )
{
   if( r.width < 0 || r.height < 0 ) return false;
 
   IplImage* img = cvLoadImage( filename, desired_color );
   if( !img )
      return false;
   if( r.width == 0 || r.height == 0 )
   {
      r.width = img->width;
      r.height = img->height;
      r.x = r.y = 0;
   }
   if( r.x > img->width || r.y > img->height ||
      r.x + r.width < 0 || r.y + r.height < 0 )
   {
      cvReleaseImage( &img );
      return false;
   }
   /* truncate r to source image */
   if( r.x < 0 )
   {
      r.width += r.x;
      r.x = 0;
   }
   if( r.y < 0 )
   {
      r.height += r.y;
      r.y = 0;
   }
   if( r.x + r.width > img->width )
      r.width = img->width - r.x;
 
   if( r.y + r.height > img->height )
      r.height = img->height - r.y;
   cvSetImageROI( img, r );
   CopyOf( img, desired_color );
   cvReleaseImage( &img );
   return true;
}
bool  CvvImage::Save( const char* filename )
{
   if( !m_img )
      return false;
   cvSaveImage( filename, m_img );
   return true;
}
void  CvvImage::Show( const char* window )
{
   if( m_img )
      cvShowImage( window, m_img );
}
void  CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y )
{
   if( m_img && m_img->depth == IPL_DEPTH_8U )
   {
      uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
      BITMAPINFO* bmi = (BITMAPINFO*)buffer;
      int bmp_w = m_img->width, bmp_h = m_img->height;
      FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );
      from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 );
      from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 );
      int sw = MAX( MIN( bmp_w - from_x, w ), 0 );
      int sh = MAX( MIN( bmp_h - from_y, h ), 0 );
      SetDIBitsToDevice(
         dc, x, y, sw, sh, from_x, from_y, from_y, sh,
         m_img->imageData + from_y*m_img->widthStep,
         bmi, DIB_RGB_COLORS );
   }
}
void  CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ) 
{
   if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData )
   {
      uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
      BITMAPINFO* bmi = (BITMAPINFO*)buffer;
      int bmp_w = m_img->width, bmp_h = m_img->height;
      CvRect roi = cvGetImageROI( m_img );
      CvRect dst = RectToCvRect( *pDstRect );
      if( roi.width == dst.width && roi.height == dst.height )
      {
         Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y );
         return;
      }
      if( roi.width > dst.width )
      {
         SetStretchBltMode(
            hDCDst,           // handle to device context
            HALFTONE );
      }
      else
      {
         SetStretchBltMode(
            hDCDst,           // handle to device context
            COLORONCOLOR );
      }
      FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );
      ::StretchDIBits(
         hDCDst,
         dst.x, dst.y, dst.width, dst.height,
         roi.x, roi.y, roi.width, roi.height,
         m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );
   }
}
void  CvvImage::Fill( int color )
{
   cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );
}

调用方法是直接把这2个文件加入到工程

CvvImage m_CvvImage;
CDC *pDC;//关闭时释放
CRect CameraPicRect;
HDC hDC;
CvCapture* Capture;
IplImage* frame;

Capture = cvCreateCameraCapture(0);//要使用的摄像头索引
if (Capture == 0)
{
    MessageBox(_T("无法连接摄像头！！！"));
    return;
}
pDC = GetDlgItem(IDC_PIC_STATIC)->GetDC();//获取显示控件的句柄
GetDlgItem(IDC_PIC_STATIC)->GetClientRect(&CameraPicRect);//得到控件尺寸
hDC = pDC->GetSafeHdc();//获取显示控件的句柄

frame = cvQueryFrame(Capture); //从摄像头或者文件中抓取并返回一帧
m_CvvImage.CopyOf(frame, 1); //复制该帧图像
m_CvvImage.DrawToHDC(hDC, &CameraPicRect); //显示到设备的矩形框内

//保存图像文件
IplImage* TakePictureFrame;
TakePictureFrame = frame;
char ImagePathName[256] = "123.jpg";
IplImage *m_snap = cvCreateImage(cvGetSize(TakePictureFrame), TakePictureFrame->depth, TakePictureFrame->nChannels);
cvCopy(TakePictureFrame, m_snap, NULL);
cvSaveImage(ImagePathName, m_snap); //把图像写入指定文件夹的文件中去
cvReleaseImage(&m_snap);

2.新版本的opencv Cvvimage 类没有，改成了Mat

把 imshow 显示 Mat 的对话框窗口添加到MFC

参考

MFC显示Mat图片

cv::Mat frame;
cv::Mat showFrame;

cv::namedWindow("view", cv::WINDOW_AUTOSIZE);
HWND hWnd = (HWND)cvGetWindowHandle("view");
HWND hParent = ::GetParent(hWnd);
::SetParent(hWnd, GetDlgItem(IDC_STA_TakePhoto)->m_hWnd);
::ShowWindow(hParent, SW_HIDE);
CRect picRect;
GetDlgItem(IDC_STA_TakePhoto)->GetClientRect(picRect);
cv::VideoCapture capture(0);
if (!capture.isOpened())
{
    MessageBox(_T("打开摄像头失败"));
}
capture >> frame;
resize(frame, showFrame, cv::Size(picRect.Width(), picRect.Height()));
imshow("view", showFrame);
cv::waitKey(30);//没有这个显示不了

//保存图片
strPathName = strPath + strName;//这里用完整路径
char chPathName[MAX_PATH];
WideCharToMultiByte(CP_ACP, 0, LPCTSTR(strPathName), -1, chPathName, MAX_PATH, NULL, NULL);
BOOL ret;
ret = imwrite(chPathName, frame);
if (!ret)
{
    MessageBox(_T("照片保存失败"));
}