Question

我正在将现有的代码库从IplImage *更新到更新的cv :: Mat。我想知道如何将我的cv :: Mat对象显示到MFC。我们使用的当前解决方案基于旧的CvvImage类：

void DrawPicToHDC(IplImage *img, UINT ID, bool bOnPaint)
{
    CDC *pDC = GetDlgItem(ID)->GetDC();
    HDC hDC= pDC->GetSafeHdc();
    CRect rect;
    GetDlgItem(ID)->GetClientRect(&rect);
    CvvImage cimg;
    cimg.CopyOf( img );
    cimg.DrawToHDC( hDC, &rect );
    ReleaseDC( pDC );
}

我遇到了this帖子，但不幸的是，提供的答案并不能满足我的需求，因为答案仍然需要您在显示之前将Mat转换为IplImage *。

有没有办法只使用cv :: Mat？非常感谢任何帮助。

更新我在Kornel的答案的帮助下，使用cv :: Mat调整了上述功能。我现在不需要包含CvvImage类：

void DrawPicToHDC(cv::Mat cvImg, UINT ID, bool bOnPaint)
{
    // Get the HDC handle information from the ID passed
    CDC *pDC = GetDlgItem(ID)->GetDC();
    HDC hDCDst = pDC->GetSafeHdc();
    CRect rect;
    GetDlgItem(ID)->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 (cvImg.size() != winSize)
    {
        cv::resize(cvImg, cvImgTmp, winSize);
    }
    else
    {
        cvImgTmp = cvImg;
    }

    // Rotate the image
    cv::flip(cvImgTmp,cvImgTmp,0);

    // Initialize the BITMAPINFO structure
    BITMAPINFO bitInfo;
    bitInfo.bmiHeader.biBitCount = 24;
    bitInfo.bmiHeader.biWidth = winSize.width;
    bitInfo.bmiHeader.biHeight = winSize.height;
    bitInfo.bmiHeader.biPlanes = 1;
    bitInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bitInfo.bmiHeader.biCompression = BI_RGB;
    bitInfo.bmiHeader.biClrImportant = 0;
    bitInfo.bmiHeader.biClrUsed = 0;
    bitInfo.bmiHeader.biSizeImage = 0;
    bitInfo.bmiHeader.biXPelsPerMeter = 0;
    bitInfo.bmiHeader.biYPelsPerMeter = 0;

    // Add header and OPENCV image's data to the HDC
    StretchDIBits(hDCDst, 0, 0,
        winSize.width, winSize.height, 0, 0,
        winSize.width, winSize.height,
        cvImgTmp.data, &bitInfo, DIB_RGB_COLORS, SRCCOPY);

    ReleaseDC( pDC );
}

Answer 1

假设我们有一个OpenCV图像cv::Mat cvImg，其中一个应转换为CImage* mfcImg。
当然，MFC图像应显示在MFC窗口上，即CStatic winImg

因此，为了在MFC窗口中显示OpenCV图像，应执行以下转换：

cv::Mat -> CImage -> CStatic

定义MFC窗口大小：

RECT r;
winImg.GetClientRect(&r);
cv::Size winSize(r.right, r.bottom);

cvImg的大小并不总是与MFC窗口的大小相同：

cv::Mat cvImgTmp(winSize, CV_8UC3);
if (cvImg.size() != winSize)
{
    cv::resize(cvImg, cvImgTmp, winSize);
}
else 
{
    cvImgTmp = cvImg.clone();
}

旋转图像：

cv::flip(cvImgTmp, cvImgTmp, 0);

创建MFC图像：

if (mfcImg)
{
    mfcImg->ReleaseDC();
    delete mfcImg; mfcImg = nullptr;
}

mfcImg = new CImage();
mfcImg->Create(winSize.width, winSize.height, 24);

对于mfcImg，您需要一个标题。使用BITMAPINFO结构

创建它

BITMAPINFO bitInfo;
bitInfo.bmiHeader.biBitCount = 24;
bitInfo.bmiHeader.biWidth = winSize.width;
bitInfo.bmiHeader.biHeight = winSize.height;
bitInfo.bmiHeader.biPlanes = 1;
bitInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bitInfo.bmiHeader.biCompression = BI_RGB;
bitInfo.bmiHeader.biClrImportant = 0;
bitInfo.bmiHeader.biClrUsed = 0;
bitInfo.bmiHeader.biSizeImage = 0;
bitInfo.bmiHeader.biXPelsPerMeter = 0;
bitInfo.bmiHeader.biYPelsPerMeter = 0;

将标题和OpenCV图像的数据添加到mfcImg

StretchDIBits(mfcImg->GetDC(), 0, 0,
    winSize.width, winSize.height, 0, 0,
    winSize.width, winSize.height,
    cvImgTmp.data, &bitInfo, DIB_RGB_COLORS, SRCCOPY
);

在MFC窗口中显示mfcImg

mfcImg->BitBlt(::GetDC(winImg.m_hWnd), 0, 0);

如果您不使用它，请发布mfcImg：

if (mfcImg)
{
    mfcImg->ReleaseDC();
    delete mfcImg; mfcImg = nullptr;
}

OpenCV 2.4：在MFC中显示cv :: Mat

1 个答案: