彻底解决显示Opencv中Mat图像到Mfc窗口问题

第一步，转换格式前预先获得待显示控件的大小，若相等则不做处理，若不等则首先改变Mat图像大小，再进行转换。

		CRect rect;
		GetDlgItem(IDC_STATIC_SRC)->GetClientRect(&rect);
		cv::Size winSize(rect.right, rect.bottom);

		// Resize the source to the size of the destination image if necessary
		cv::Mat cvImgTmp(winSize, CV_8UC3);
		if (imgSrc.size() != winSize)
		{
			cv::resize(imgSrc, cvImgTmp, winSize);
		}
		else
		{
			cvImgTmp = imgSrc;
		}	

第二步，将Mat图像转换成CImage格式

int Mat2CImage(Mat *mat, CImage &img) {
	if (!mat || mat->empty())
		return -1;
	int nBPP = mat->channels() * 8;
	img.Create(mat->cols, mat->rows, nBPP);
	if (nBPP == 8)
	{
		static RGBQUAD pRGB[256];
		for (int i = 0; i < 256; i++)
			pRGB[i].rgbBlue = pRGB[i].rgbGreen = pRGB[i].rgbRed = i;
		img.SetColorTable(0, 256, pRGB);
	}
	uchar* psrc = mat->data;
	uchar* pdst = (uchar*)img.GetBits();
	int imgPitch = img.GetPitch();
	for (int y = 0; y < mat->rows; y++)
	{
		memcpy(pdst, psrc, mat->cols*mat->channels());//mat->step is incorrect for those images created by roi (sub-images!)
		psrc += mat->step;
		pdst += imgPitch;
	}

	return 0;
}

第三步，可以直接显示CImage格式图像

	CImage imgDst;
		Mat2CImage(&cvImgTmp, imgDst);
		imgDst.Draw(GetDlgItem(IDC_STATIC_SRC)->GetDC()->GetSafeHdc(), rect);