MFC+Opencv显示图像的几种方法

╰半夏微凉° 2022-06-09 00:40 293阅读 0赞

原文地址：http://blog.csdn.net/u012250337/article/details/51601905

（1）使用[opencv][]的CvvImage类

该方法比较简单，但是opencv2.x以上版本已经不支持CvvImage类，不过可以在网上下载该类的头文件和源文件，添加到工程里就可以使用了。

**\[cpp\]** [view plain][] [copy][view plain]

1.  **void** CXXXDlg::DrawIplImage2MFC(IplImage\* img, unsigned **int** id) 
2.  \{ 
3.   CDC\* pDC = GetDlgItem(id)->GetDC(); 
4.  **HDC** hDC = pDC->GetSafeHdc(); 
5.   CvvImage cimg; 
6.   cimg.CopyOf( img ); 
7.   CRect rect; 
8.   GetDlgItem(id)->GetClientRect(&rect); 
9.   cimg.DrawToHDC(hDC, &rect); 
10.  ReleaseDC( pDC ); 
11. \}

函数参数中id是控件ID，比如IDC\_STATIC（下同）。

（2）使用MFC的绘图函数  
该方法利用MFC的绘图函数，将opencv图像数据先copy到缓冲去然后在控件上显示出来。

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1.  **void** CXXXDlg::DrawIplImage2MFC(IplImage\* img, unsigned **int** id) 
2.  \{ 
3.  **BYTE** \*g\_pBits; 
4.  **HDC** g\_hMemDC; 
5.  **HBITMAP** g\_hBmp, g\_hOldBmp; 
6.   CDC \*pDC; 
7.   CStatic \*pic; 
8.  **int** width, height; 
9.   CRect rect; 
10.  pDC = GetDlgItem(id)->GetDC(); 
11.  pic = (CStatic\*)GetDlgItem(id); 
12.  pic->GetClientRect(&rect); 
13.  width = rect.Width(); 
14.  height = rect.Height(); 
15.  g\_hMemDC =::CreateCompatibleDC(pDC->m\_hDC); 
16. **BYTE** bmibuf\[**sizeof**(BITMAPINFO)+256 \* **sizeof**(RGBQUAD)\]; 
17.  memset(bmibuf, 0, **sizeof**(bmibuf)); 
18.  BITMAPINFO \*pbmi = (BITMAPINFO\*)bmibuf; 
19.  pbmi->bmiHeader.biSize = **sizeof**(BITMAPINFOHEADER); 
20.  pbmi->bmiHeader.biWidth = img->width; 
21.  pbmi->bmiHeader.biHeight = img->height; 
22.  pbmi->bmiHeader.biPlanes = 1; 
23.  pbmi->bmiHeader.biBitCount = 24; 
24.  pbmi->bmiHeader.biCompression= BI\_RGB; 
25.  g\_hBmp =::CreateDIBSection(g\_hMemDC, pbmi, DIB\_RGB\_COLORS, (**void**\*\*)&g\_pBits, 0, 0); 
26.  g\_hOldBmp = (**HBITMAP**)::SelectObject(g\_hMemDC, g\_hBmp); 
27.  BitBlt(g\_hMemDC, 0, 0, width, height, pDC->m\_hDC, 0, 0, SRCCOPY); 
28. **int** l\_width = WIDTHBYTES(img->width\* pbmi->bmiHeader.biBitCount); 
29. **for** (**int** row = 0; row < img->height;row++) 
30.  memcpy(&g\_pBits\[row\*l\_width\],&img->imageData\[ (img->height - row - 1)\*l\_width\], l\_width); 
31.  TransparentBlt(pDC->m\_hDC, 0, 0, width, height, g\_hMemDC, 0, 0, img->width, img->height, RGB(0, 0, 0)); 
32.  SelectObject(g\_hMemDC, g\_hOldBmp); 
33.  DeleteDC(g\_hMemDC); 
34.  DeleteObject(pic); 
35.  DeleteObject(g\_hBmp); 
36.  DeleteObject(g\_hOldBmp); 
37. \}

（3）链接opencv窗口和MFC控件

该方法是将opencv的显示窗口与MFC的控件链接起来，效果是opencv的窗口恰好覆盖在控件上。

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1.  //pic是opencv窗口的标志符，name是窗口名字，ID同上，是MFC控件ID

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1.  **bool** CXXXDlg::attachWindow(string &pic,**const****char**\* name,**int** ID) 
2.  \{ 
3.   pic=string(name); 
4.   cv::namedWindow(pic, 1); 
5.  **HWND** hWnd = (**HWND**) cvGetWindowHandle(name); 
6.  **HWND** hParent = ::GetParent(hWnd); 
7.   ::SetParent(hWnd, GetDlgItem(ID)->m\_hWnd); 
8.   ::ShowWindow(hParent, SW\_HIDE); 
9.  **return****true**; 
10. \}

**\[cpp\]** [view plain][] [copy][view plain]

1.  **bool** CXXXDlg::showImage(string pic,**int** id,cv::Mat mat) 
2.  \{ 
3.   CRect rect; 
4.   GetDlgItem(id)->GetClientRect(&rect); 
5.   cv::resize(mat,mat,cv::Size(rect.Width(),rect.Height()),CV\_INTER\_CUBIC); 
6.   imshow(pic,mat); 
7.  **return****true**; 
8.  \}

**\[cpp\]** [view plain][] [copy][view plain]

1.  </pre><pre>

使用方法是先链接opencv窗口的标识符和控件ID

**\[cpp\]** [view plain][] [copy][view plain]

1.  string pic; 
2.  attachWindow(pic,"win",IDC\_PIC);

然后在需要显示图像的地方调用showImage

**\[cpp\]** [view plain][] [copy][view plain]

1.  Mat mat=imread("1.jpg"); 
2.  showImage(pic,IDC\_PIC,mat); 
3.

[opencv]: http://lib.csdn.net/base/opencv
[view plain]: http://blog.csdn.net/u012250337/article/details/51601905#