How to convert Bitmap to Image

Question

I am using the OpenCV library for image processing.

I want to convert a System.Drawing.Bitmap to an Image<Bgr, Byte>. How can I do this?

score 20 · Accepted Answer · answered Apr 26 '13 at 16:26

20

The Image constructor has a Bitmap overload (assuming you're using the Emgu CV wrapper since you've marked it .NET).

Image<Bgr, Byte> myImage = new Image<Bgr, Byte>(myBitmap);

answered Apr 26 '13 at 16:26

keyboardP

68,824
13
156
205

Errer: The type initializer for 'Emgu.CV.CvInvoke' threw an exception. – Lemmouchi Rédha Dida Apr 26 '13 at 17:50
Try the steps described here http://www.emgu.com/wiki/index.php/Download_And_Installation#The_type_initializer_for_.27Emgu.CV.CvInvoke.27_threw_an_exception. – keyboardP Apr 26 '13 at 17:59
This constructor was removed in version 4.2.0. Check the other (newer) answers instead, if you are using a version newer than that. – Tobias Xy Jul 04 '22 at 13:08

score 17 · Answer 2 · answered Dec 16 '20 at 10:04

17

In .NET Emgu.CV 4.4.0.4099 I had to install Emgu.CV.Bitmap 4.4.0.4099 and Emgu.CV.runtime.windows in order to use the bitmap.ToImage<Bgr, byte>() extension method.

answered Dec 16 '20 at 10:04

Nikolay Kostov

16,433
23
85
123

1

Thanks, just what I was looking for. Especially since their documentation pages give an exception when I browse to them... – Carra Feb 04 '21 at 22:23

score 16 · Answer 3 · answered Jul 03 '20 at 23:27

The constructor for Image<Bgr, byte> no longer accepts Bitmap as parameter. I had to use the following code for Emgu version 4.3:

Image<Bgr, byte> emguImage = bitmap.ToImage<Bgr, byte>();

I found it on github and in patch notes. The official documentation tutorials were not properly updated.

score 3 · Answer 4 · answered May 27 '21 at 05:07

3

I am using Emgu.CV 4.5.1.4349 on NetStandard 2.1 Need to install Emgu.CV.Bitmap and Emgu.CV.runtime.windows in order to convert your Bitmap to Image<Bgr, byte>

var myImage = myBitmap.ToImage<Bgr, byte>()

answered May 27 '21 at 05:07

christopher Ng

31
1

score 0 · Answer 5 · answered Aug 18 '18 at 12:41

for whom to be concern: you should add dependency dll into project and change 'copy to output directory' property to 'copy always' (add -> existing item) from Emgu\emgucv-windows-universal-cuda 2.9.0.1922\bin\x86

in my project add : opencv_core290.dll , opencv_highgui290.dll , opencv_ffmpeg290.dll , opencv_imageproc290.dll and cudart32_55.dll

from: The type initializer for 'Emgu.CV.CvInvoke' threw an exception

score 0 · Answer 6 · answered Nov 17 '20 at 11:45

I'm using Emgu 4.3.0.3890 and I had the same problem I integrated my code with my team. The line that gave me trouble was:

Image<Bgr, byte> img = bitmap.ToImage<Bgr, byte>();

I didn't see that the build created two new directories named x86 and x64. When I discovered it, I added these two directories to the location of my binary files and every thing worked. I didn't have the time to to elimination to see which one of the files in these directories is responsible for it but hey, it worked. :-)

How to convert Bitmap to Image

6 Answers6

Linked