Bitmap与IplImage之间的转换

在MFC编程中,用OpenCV来处理图像时,可能会进行Bitmap与IplImage之间的转换;所以在此留个记号,以免下次再用到的时候,还要去找。

 

IplImage* BitmapToIplImage(HBITMAP hBmp)
{
	BITMAP bmp;    
	
	GetObject(hBmp, sizeof(BITMAP), &bmp);
	int depth     = (bmp.bmBitsPixel == 1) ? IPL_DEPTH_1U : IPL_DEPTH_8U;
	int nChannels = (bmp.bmBitsPixel == 1) ? 1 : bmp.bmBitsPixel/8;    
	
	IplImage* img = cvCreateImage(cvSize(bmp.bmWidth,bmp.bmHeight), depth, nChannels);  
	
	BYTE *pBuffer = new BYTE[bmp.bmHeight*bmp.bmWidth*nChannels];    
	GetBitmapBits(hBmp, bmp.bmHeight*bmp.bmWidth*nChannels, pBuffer);
	memcpy(img->imageData, pBuffer, bmp.bmHeight*bmp.bmWidth*nChannels);   
	delete pBuffer;

	IplImage *dst = cvCreateImage(cvGetSize(img), img->depth,3);    
	cvCvtColor(img, dst, CV_BGRA2BGR);   
	cvReleaseImage(&img);   
	return dst;
}

 如果要从CBitmap转为IplImage,可以先将CBitmap转为BITMAP,再由BITMAP转为IplImage;

// CBitmap 转为 BITMAP
CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP);
BITMAP   bmp;
bitmap.GetBitmap(&bmp);

// CBitmap与HBITMAP间的转换
// CBitmap转为HBITMAP
CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP);
HBITMAP bmp = HBITMAP(bitmap);
// HBITMAP转为CBitmap
HBITMAP  hbitmap;  
CBitmap   bitmap;
bitmap.Attach(hbitmap);
 

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