MFC：将Mat类型的图片显示在图片控件上

一、Mat图像显示在MFC的图像控件上

void CCameraLinkTestDlg::ShowMatImg(Mat& mat, int ID,CPoint point0,CPoint pointCont0)
{
	// TODO: 在此处添加实现代码.
	BITMAPINFO* pBmpInfo1 = NULL;
	if (mat.channels() == 1)//灰度图像显示
	{
		pBmpInfo1 = (BITMAPINFO*)new char[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];////bmp图信息头	
		pBmpInfo1->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
		pBmpInfo1->bmiHeader.biWidth = mat.cols;//src_rec.Width();
		pBmpInfo1->bmiHeader.biHeight = -mat.rows; //-src_rec.Height();//为负值
		pBmpInfo1->bmiHeader.biPlanes = 1;
		pBmpInfo1->bmiHeader.biBitCount = 8;//八位
		pBmpInfo1->bmiHeader.biCompression = BI_RGB;
		pBmpInfo1->bmiHeader.biSizeImage = 0;
		pBmpInfo1->bmiHeader.biXPelsPerMeter = 0;
		pBmpInfo1->bmiHeader.biYPelsPerMeter = 0;
		pBmpInfo1->bmiHeader.biClrUsed = 0;
		pBmpInfo1->bmiHeader.biClrImportant = 0;

		for (int i = 0; i < 256; i++)//只有灰度图像需要颜色表
		{
			pBmpInfo1->bmiColors[i].rgbBlue = pBmpInfo1->bmiColors[i].rgbGreen = pBmpInfo1->bmiColors[i].rgbRed = (BYTE)i;
			pBmpInfo1->bmiColors[i].rgbReserved = 0;
		}
	}
	if (mat.channels() == 3)
	{
		pBmpInfo1 = (BITMAPINFO*) new char[sizeof(BITMAPINFOHEADER)];
		pBmpInfo1->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
		pBmpInfo1->bmiHeader.biWidth = mat.cols;//src_rec.Width();
		pBmpInfo1->bmiHeader.biHeight = -mat.rows; //-src_rec.Height();//为负值
		pBmpInfo1->bmiHeader.biPlanes = 1;
		pBmpInfo1->bmiHeader.biBitCount = 24;//24位
		pBmpInfo1->bmiHeader.biCompression = BI_RGB;
		pBmpInfo1->bmiHeader.biSizeImage = 0;
		pBmpInfo1->bmiHeader.biXPelsPerMeter = 0;
		pBmpInfo1->bmiHeader.biYPelsPerMeter = 0;
		pBmpInfo1->bmiHeader.biClrUsed = 0;
		pBmpInfo1->bmiHeader.biClrImportant = 0;
	}
	HDC h_dc = GetDlgItem(ID)->GetDC()->GetSafeHdc();
	CRect BoxSize;
	GetDlgItem(ID)->GetClientRect(&BoxSize);
	SetStretchBltMode(
		h_dc,           // handle to device context
		HALFTONE);
    StretchDIBits(h_dc, point0.x,point0.y, mat.cols, mat.rows, pointCont0.x, pointCont0.y, mat.cols, mat.rows, (void*)mat.data,
		(BITMAPINFO*)pBmpInfo1, DIB_RGB_COLORS, SRCCOPY);
	delete[]pBmpInfo1;
}

调用：

//获取Picture Control控件的大小
CRect rect;
GetDlgItem(IDC_SHOWIMG)->GetClientRect(&rect);
leftTop.x = rect.left;
leftTop.y = rect.top;
widthOfPicCtrl = rect.Width();
heightOfPicCtrl = rect.Height();

//IDC_SHOWIMG:图片控件的ID
ShowMatImg(mat, IDC_SHOWIMG, CPoint(int((widthOfPicCtrl - mat.cols) / 2) +leftTop.x, int((heightOfPicCtrl - mat.rows)/2) + leftTop.y),leftTop);

二、将Mat类型转换成CImage类型

MatToCImage(Mat& mat, CImage& cImage)
{
	// TODO: 在此处添加实现代码.
	//图像宽
	int width = mat.cols;
	//图像高
	int height = mat.rows;
	//图像通道数
	int channels = mat.channels();

	cImage.Destroy();
	//创建一个CImage类型的图片对象
	cImage.Create(width, height, 8 * channels);
	
	uchar* ps;
	 //获取CImage的像素存贮区的指针
	uchar* pimg = (uchar*)cImage.GetBits();
	//每行的字节数,注意这个返回值有正有负
	int step = cImage.GetPitch();
	// 如果是1个通道的图像(灰度图像) DIB格式才需要对调色板设置  
	// CImage中内置了调色板，我们要对他进行赋值：
	if (1 == channels)
	{
		RGBQUAD* ColorTable;
		int MaxColors = 256;
		//这里可以通过CI.GetMaxColorTableEntries()得到大小(如果你是CI.Load读入图像的话)  
		ColorTable = new RGBQUAD[MaxColors];
		cImage.GetColorTable(0, MaxColors, ColorTable);//这里是取得指针  
		for (int i = 0; i < MaxColors; i++)
		{
			ColorTable[i].rgbBlue = (BYTE)i;
			//BYTE和uchar一回事，但MFC中都用它  
			ColorTable[i].rgbGreen = (BYTE)i;
			ColorTable[i].rgbRed = (BYTE)i;
		}
		cImage.SetColorTable(0, MaxColors, ColorTable);
		delete[]ColorTable;
	}

	for (int i = 0; i < height; i++)
	{
		ps = mat.ptr<uchar>(i);
		for (int j = 0; j < width; j++)
		{
			if (1 == channels)
			{
				*(pimg + i* step + j) = ps[j];
			}
			else if (3 == channels)
			{
				*(pimg + i*step + j* 3) = ps[j * 3];
				*(pimg + i*step + j* 3 + 1) = ps[j * 3 + 1];
				*(pimg + i*step + j* 3 + 2) = ps[j * 3 + 2];
			}
		}
	}
}

调用函数：

CWnd* pWnd = NULL;
//获得图片控件的句柄
pWnd = GetDlgItem(IDC_SHOWIMG);
//获得设备描述表DC
CDC* pDC = GetDlgItem(IDC_SHOWIMG)->GetDC();

//创建一个CImage类型的对象
CImage img;	
//将Mat类型转换成CImage类型				
MatToCImage(mat, img);
//显示在图片控件上
img.StretchBlt(pDC->m_hDC,0,0,mat.cols,mat.rows,0,0,mat.cols,mat.rows,SRCCOPY);

留着学习：
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