opencv在mfc窗口显示图片

mfc显示mat图片的两种方式

方式一：将opencv的窗口嵌入到mfc的窗口内

  将opencv窗口与mfc窗口绑定之后就可以通过cv::imshow("video",img)显示mat格式的img了

    cv::namedWindow("video", CV_WINDOW_NORMAL);//设置窗口名
	HWND m_wincv = (HWND)cvGetWindowHandle("video");//获取opencv窗口句柄
	HWND hParent1 = ::GetParent(m_wincv);//取窗口的父窗口句柄
	//IDC_VIDEO为mfc中picture control的ID号
	HWND hw = ::SetParent(m_wincv, GetDlgItem(IDC_VIDEO)->m_hWnd); // 设置新的父窗口句柄
	::ShowWindow(hParent1, SW_HIDE);   //隐葳原openCV窗口的边框
	 CRect rect;
	GetDlgItem(IDC_VIDEO)->GetClientRect(rect);   //获取mfc窗口的大小
	//将opencv窗口设置位与mfc窗口大小移植
	cv::resizeWindow("video", rect.Width(), rect.Height());   

方法二：将opencv中mat格式的图片数据转为CImage的类

CImage这个类可以实现mfc界面的贴图功能

void MatToCImage(cv::Mat& mat, CImage& cImage)   //将mat类型转为CImage
{
	//create new CImage  
	int width = mat.cols;
	int height = mat.rows;
	int channels = mat.channels();

	cImage.Destroy(); //clear  
	cImage.Create(width, height, 8 * channels); //默认图像像素单通道占用1个字节  

	//copy values  
	uchar* ps;
	uchar* pimg = (uchar*)cImage.GetBits(); //A pointer to the bitmap buffer  
	int step = cImage.GetPitch();

	for (int i = 0; i < height; ++i)
	{
		ps = (mat.ptr<uchar>(i));
		for (int j = 0; j < width; ++j)
		{
			if (channels == 1) //gray  
			{
				*(pimg + i * step + j) = ps[j];
			}
			else if (channels == 3) //color  
			{
				for (int k = 0; k < 3; ++k)
				{
					*(pimg + i * step + j * 3 + k) = ps[j * 3 + k];
				}
			}
		}
	}
}

	  //下面这段代码是实现mfc的贴图功能
	    RECT m_rect;
		CImage cimage;
		GetDlgItem(IDC_VIDEO)->GetClientRect(&m_rect);
		CDC* pdc =GetDlgItem(IDC_VIDEO)->GetDC();
		int win_w = m_rect.right - m_rect.left;
		int win_h = m_rect.bottom - m_rect.top;
		MatToCImage(matImg, cimage);   //将mat转CImage
		SetStretchBltMode(pdc->m_hDC, STRETCH_HALFTONE); //不执行该语句会导致窗口绘制出的图片有很多噪点，严重失真
		cimage.Draw(pdc->m_hDC, 0, 0, win_w, win_h,0,0, matImg.cols, matImg.rows);
		ReleaseDC(pdc);

补充：

//在mfc窗口绘制矩形框
void   DrawRect(CDC* pDC, int x1, int y1, int x2, int y2, int color)
{
	// 在鼠标点击窗体的位置、且以该位置为中心绘制一个非填充的红色方框 
	//CRect rect;
	int i = 0;
	switch (color)
	{
	case 0:
	{
		CPen NewPen(PS_SOLID, 1, RGB(255, 0, 0)); // 定义一个红色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 1:
	{
		CPen NewPen(PS_SOLID, 1, RGB(0, 255, 0)); // 定义一个绿色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 2:
	{
		CPen NewPen(PS_SOLID, 1, RGB(0, 0, 255)); // 定义一个蓝色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 3:
	{
		CPen NewPen(PS_SOLID, 1, RGB(255, 255, 0)); // 定义一个红绿色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 4:
	{
		CPen NewPen(PS_SOLID, 1, RGB(255, 0, 255)); // 定义一个红蓝色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 5:
	{
		CPen NewPen(PS_SOLID, 1, RGB(0, 255, 255)); // 定义一个蓝绿色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	case 6:
	{
		CPen NewPen(PS_SOLID, 1, RGB(255, 255, 255)); // 定义一个红绿蓝色的画笔
		pDC->SelectObject(&NewPen);
		pDC->SelectObject(GetStockObject(NULL_BRUSH)); // 选择画刷(空的画刷，不对矩形框进行填充)
		pDC->Rectangle(x1, y1, x2, y2);
		break;
	}
	}

}

参考：

MFC OpenCV：显示图片的3种方法（详细）