Convert Bitmap to Mat

Question

I need to convert Gdiplus::Bitmap to cv::Map format. I\'m using this code to do this:

Gdiplus::Bitmap* enhanced = ...; // some Bitmap
Gdiplus::BitmapData bmp         


        

Answer 1

if you're constructing a cv::Mat from your Bitmap, you will have to use

cv::imshow("w", imageMap);

to draw it.

again, the address of a cv::Mat is not the same as an IplImage* required by cvShowImage();

(btw, you should get rid of all other deprecated c-api calls, too.)

also, be a bit careful, a Mat constructed the way you do, has a borrowed pointer to the pixels.

i don't know anything about gdi+, but if that pointer goes out of scope or gets invalid when you call enhanced->UnlockRect (or what it was called), you will need to do

Mat safeImg = imageMap.clone();

to achieve a 'deep' copy.