CODEWITHSUNDEEP
c++opencvbitmapgdi+
Mafahir Fairoze
Mafahir Fairoze

Reputation: 697

Converting GdiPlus::Bitmap to OpenCV IplImage

I have a 24bpp GdiPlus::Bitmap that i need to convert into IplImage (opencv). Does anyone know how can this be done?

Upvotes: 3

Views: 2213

Answers (3)

jwezorek
jwezorek

Reputation: 9525

The difficulty is that Gdiplus::Bitmap supports lots of exotic pixel formats in theory, so in full generality the conversion would be verbose. However, the basic case is as follows:

IplImage* GdiPlusBitmapToOpenCvImage(Gdiplus::Bitmap* bmp)
{
    auto format = bmp->GetPixelFormat();
    if (format != PixelFormat24bppRGB)
        return nullptr;

    Gdiplus::Rect rcLock(0, 0, bmp->GetWidth(), bmp->GetHeight());
    Gdiplus::BitmapData bmpData;

    bmp->LockBits(&rcLock, Gdiplus::ImageLockModeRead, format, &bmpData);

    int buffSz = bmpData.Stride * bmpData.Height;
    int depth = 8, channel = 3;
    IplImage* cvImage = cvCreateImage(CvSize(rcLock.Width, rcLock.Height), depth, channel);
    const unsigned char* src = static_cast<unsigned char*>(bmpData.Scan0);
    std::copy(src, src + buffSz, cvImage->imageData);

    bmp->UnlockBits(&bmpData);
    return cvImage;
}

Upvotes: 0

Ann Orlova
Ann Orlova

Reputation: 1348

Here is an answer for your issue with the only difference, that BitMap converts to Mat: Convert Bitmap to Mat

Upvotes: 0

Hoshin
Hoshin

Reputation: 454

Here is how you can do it.

1.) Create a new target IplImage object with the dimensions of Source image (GdiPlus::Bitmap)

2.) Get the pixeldata handle of Source image using lockbits

3.) Copy the source pixeldata to target imagedata

4.) UnlockBits of source image

Upvotes: 1

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