IplImage 与 CBitmap类 的相互转换

转自：http://blog.csdn.net/highyyy/archive/2011/02/26/6210408.aspx

在VC中利用OpenCV做图像处理程序时，有时需要把IpImage 类型和CBitmap类型相互转换，这样就可以利用VC中的GDI+函数对图像进行某些特殊的显示和处理，非常方便。这里是本人项目中写的两个转换小函数，仅供参考，转载注明，这样方便发现问题的朋友联系我及时修改。

1.IplImage转换为CBitmap类型

CBitmap * IplImage2CBitmap(const IplImage *pImage)
{
    if( pImage && pImage->depth == IPL_DEPTH_8U )
    {
        HDC hDC=GetDC()->GetSafeHdc();
       uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
       BITMAPINFO* bmi = (BITMAPINFO*)buffer;
       int bmp_w = pImage->width, bmp_h = pImage->height;
       FillBitmapInfo( bmi, bmp_w, bmp_h, pImage->depth*pImage->nChannels, pImage->origin );
     
       char *pBits=NULL;
       HBITMAP hBitmap=CreateDIBSection(hDC,bmi,DIB_RGB_COLORS,(void**)&pBits,NULL,0);
       memcpy(pBits,pImage->imageData,pImage->imageSize);
       CBitmap *pBitmap=new CBitmap;
       pBitmap->Attach(hBitmap);

       return pBitmap;
    }
    else
       return NULL;
}

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;
       }
    }
}

2.CBitmap转换为IplImage类型

IplImage *CBitmap2IplImage(const CBitmap *pBitmap)
{
     DIBSECTION ds;
     pBitmap->GetObject(sizeof(ds),&ds);
     IplImage *pImage=cvCreateImage(cvSize(ds.dsBm.bmWidth,ds.dsBm.bmHeight),8,ds.dsBmih.biBitCount/8);
     memcpy(pImage->imageData,ds.dsBm.bmBits,pImage->imageSize);
     return pImage;
}

3.HBITMAP 转换为IplImage

IplImage* hBitmap2Ipl(HBITMAP hBmp)
{
    BITMAP bmp;
    ::GetObject(hBmp,sizeof(BITMAP),&bmp);
    int nChannels = bmp.bmBitsPixel == 1 ? 1 : bmp.bmBitsPixel/8 ;
    int depth = bmp.bmBitsPixel == 1 ? IPL_DEPTH_1U : IPL_DEPTH_8U;
    IplImage* img = cvCreateImage( cvSize(bmp.bmWidth, bmp.bmHeight), depth, nChannels);
    //img->imageData = (char*)malloc(bmp.bmHeight*bmp.bmWidth*nChannels*sizeof(char));
    memcpy(img->imageData,(char*)(bmp.bmBits),bmp.bmHeight*bmp.bmWidth*nChannels);
    return img;
}