在VC的MFC中使用控件，显示OpenCv取得的视频

作者：BB高擎天的空间

转自：http://hi.baidu.com/cahbb/item/81f2f653ebd76c434eff2015

在用opencv编程中，使用的环境是vc 的MFC，如果要在对话框的窗体中显示出视频做如下操作。

注意事项：个人在使用时，在定时器中需要进行释放内存使用：

cvReleaseImage(&src);但是使用这个命令后报错，在这句的前面增加一句：src=0;就可以进行正常释放内存了，不然报错，也不知根本原因。

1：在对话框中增加一个Picturer控件。

2：定义CvvImage类型的变量m_CvvImage，这个类型的变量里有函数DrawToHDC能在MFC的控件中显示视频。

这个CvvImage是有一个.cpp 文件 一个.h 文件。是从网上下载的。

https://skydrive.live.com/?v=DevicesView#cid=F85D0932FEB0847C&id=F85D0932FEB0847C%21156

3:在对话框中加入消息TIME， ON_TIME

m_Frame=cvQueryFrame(m_Video);//m_Frame是IplImage指针类型

m_CvvImage.CopyOf(m_Frame,1);//m_CvvImage是CvvImage类型1是黑白，3是彩色。

m_CvvImage.DrawToHDC(hDC, &rect);

//将CvvImage显示在picture控件中,hDC是picture控件的句柄.rect是picture的区域.

4：在程序开头加入

#include "CvvImage.h"

CvvImage ShowVideo; //用来将opencv的图像放到vc的图片控件中。

HDC Disp_hDC1; //

CRect Disp_Rect1(1,1,280,168) ; //窗口，显示图像的大小

5：在OnInitDialog()中加入

CWnd *pwnd; //窗体基类

CDC *pDC;

pwnd = GetDlgItem(IDC_pic1); //根据ID值获取对话框中子窗体控件对象指针,

pDC =pwnd->GetDC(); //取得客户区显示设备dc

Disp_hDC2= pDC->GetSafeHdc(); //获取客户区按钮3窗体的设备描述DC给Disp_hD

6:在ontime中加入

src=cvQueryFrame(pCap); //读取摄像头一帧数据

ShowVideo.CopyOf(src,3);

ShowVideo.DrawToHDC(Disp_hDC2,Disp_Rect2); //在pic1上面显示出来原始图像的样子。

//-----------------以下为CvvImage.cpp

#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) );

}

//---------------以下为CvvImage.h

#pragma once

#ifndef CVVIMAGE_CLASS_DEF

#define CVVIMAGE_CLASS_DEF

#include "opencv.hpp"

/* 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