Question

In old version of opencv we had the class like CvvImage, that were easily used for MFC controls to display camera images or simple images from the OpenCV. But in 2.4 or 2.3 this support is finished by the OpenCV , i wonder if we have any other class in new version.

My application is MFC SDI and inside view i am over riding the OnPaint function. In previous opencv i was using Paint function like

void CRightCameraView::OnPaint()
{
    CPaintDC dc(this); // device context for painting
    m_CVvimageObj.CopyOf(m_iplImageFrame); //copy IplImage frame

    if(m_bImageDisplay)
    {
    m_CVvimageObj.Show(dc.GetSafeHdc(),10,0,m_CVvimageObj.Width(),m_CVvimageObj.Height());
    }


}

Kindly guide me which is the most update version of class to do same thing and support such DC controls of MFC.

Answer 1

Since i could not find the answer i would like to help others what i did.

I have extracted cvvimage class manually and added in my project and then i did the following ..

in my views header file i declared

CvvImage m_CVvImageObj;
cv::Mat m_matImage;

inside my CPP file of view , i have called following in initialization function

m_matImage = cv::imread(strA.GetBuffer(),CV_LOAD_IMAGE_COLOR);   // Read the file

if(! m_matImage.data )                              // Check for invalid input
{
    AfxMessageBox(L"Could not open or find the image");
}


 IplImage iplimg = m_matImage;
 m_CVvImageObj.CopyOf(&iplimg);
 UpdateData();
 Invalidate();

inside the overided function of OnPaint inside view i added

if(m_CVvImageObj.GetImage())
{       
    //m_CurrentFrame.Show
        m_CVvImageObj.Show(dc.GetSafeHdc(),10,0,m_CVvImageObj.Width(),m_CVvImageObj.Height());
}

Cvvimage h file is the following

#pragma once

//#pragma once  
#ifndef CVVIMAGE_CLASS_DEF  
#define CVVIMAGE_CLASS_DEF  

#include <opencv2\highgui\highgui.hpp>    
class CvvImage  
{  
public:  
    CvvImage();  
    virtual ~CvvImage();  

    virtual bool Create( int width, int height, int bits_per_pixel, int image_origin = 0 );  
    virtual bool Load( const char* filename, int desired_color = 1 );  
    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  

    virtual bool Save( const char* filename );  
    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);  
    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 );  
    virtual void Show( const char* window );  

#if defined WIN32 || defined _WIN32  
    virtual void Show( HDC dc, int x, int y, int width, int height,  
        int from_x = 0, int from_y = 0 );  
    virtual void DrawToHDC( HDC hDCDst, RECT* pDstRect );  
    virtual void DrawToHDC( HDC hDCDst, CvRect pDstRect ); 
#endif  

protected:

    IplImage* m_img;

};

typedef CvvImage CImage;

#endif

and CPP file for cvvimage class is following

///////////////////////////////////////////////////////////////////////////////////////////////////
//CvvImage.cpp

#include "StdAfx.h"  
#include "CvvImage.h"
///////////////////////////////////////////////////////////////////////////////////////////////////

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();

        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;
    }

    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::DrawToHDC( HDC hDCDst, CvRect pDstRect )
{
    RECT rDest=CvRectToRect(pDstRect);
    DrawToHDC(hDCDst,&rDest);
}
void CvvImage::Fill( int color )
{
    cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );
}

enjoy.