void CshowimageDlg::ShowImg(Mat &img, UINT ID)

最新推荐文章于 2023-12-29 13:23:14 发布

原创最新推荐文章于 2023-12-29 13:23:14 发布 · 590 阅读

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本文介绍了一种在Windows应用程序中将OpenCV图像显示到对话框的方法。通过使用CDC和StretchDIBits函数，实现了图像的有效缩放和显示，支持不同大小的图像。此外，还考虑了图像连续性和宽度对齐的问题。

void CshowimageDlg::ShowImg(Mat &img, UINT ID)
{
	CDC *pDC = GetDlgItem(ID)->GetDC();


	CRect rect;
	GetDlgItem(ID)->GetClientRect(rect);
	RECT* pRect=▭
	if( pDC && pRect && !img.empty() )
	{
		uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
		BITMAPINFO* bmi = (BITMAPINFO*)buffer;
		int bmp_w = img.cols, bmp_h = img.rows;
		BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);
		memset( bmih, 0, sizeof(*bmih));
		bmih->biSize = sizeof(BITMAPINFOHEADER);
		bmih->biWidth = bmp_w;
		bmih->biHeight = -bmp_h;// : -abs(height);
		bmih->biPlanes = 1;
		bmih->biBitCount = IPL_DEPTH_8U*img.channels();
		bmih->biCompression = BI_RGB;


		if( IPL_DEPTH_8U*img.channels() == 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;
			}
		}


		if(pRect->right - pRect->left +1 < bmp_w )
		{
			SetStretchBltMode(
				pDC->m_hDC,           // handle to device context
				HALFTONE );
		}
		else
		{
			SetStretchBltMode(
				pDC->m_hDC,           // handle to device context
				COLORONCOLOR );
		}


		if(img.cols % 4 != 0 && img.isContinuous())
		{
			IplImage *tempimg = cvCreateImage(img.size(), 8, img.channels());
			img.copyTo(Mat(tempimg));


			::StretchDIBits(
				pDC->m_hDC,
				pRect->left, pRect->top, pRect->right - pRect->left+1, pRect->bottom - pRect->top+1,
				0, 0, bmp_w, bmp_h,
				tempimg->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );


			cvReleaseImage(&tempimg);
		} 
		else
		{
			::StretchDIBits(
				pDC->m_hDC,
				pRect->left, pRect->top, pRect->right - pRect->left+1, pRect->bottom - pRect->top+1,
				0, 0, bmp_w, bmp_h,
				img.data, bmi, DIB_RGB_COLORS, SRCCOPY );


		}


	}
	return;
}