# Mamba3d and numpy

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### mohamma...@gmail.com

Aug 16, 2014, 7:04:16 AM8/16/14
Hi
Is it possible to convert a 3d numpy array to a a mamba3D image?

### Nicolas Beucher

Aug 17, 2014, 3:17:48 PM8/17/14
Hi,

There is no reason for it not to be possible.
Here is an example of inyterfacing numpy and mamba for 2D images :

For 3D images you will have to proceed image by image by loading your 3D array by slices.

Nicolas.

Aug 19, 2014, 7:47:13 PM8/19/14
Hi
Thanks for your response. The thing is that i like to use mamba3d.segment3d.label3d function on a 3d numpy array. But I dont understand how to do that.
If I load the array slice by slice, how can I combine them together to be a 3D tensor so I can apply label3d on it?

Thank you very much

### Serge Beucher

Aug 21, 2014, 3:46:38 AM8/21/14
Hi,

I don't clearly understand your problem. If you want to use the Mamba 3D segmentation tools (watershed transformation), your 3D image must be stored in a Mamba image created with image3DMb. This 3D image is basically a pile of 2D Mamba images. Suppose that your 3D Mamba image is named im3D. Then, you need to extract each slice i of your numpy array (I am not familiar with numpy but I know that this slicing tool exists) and store it in the corresponding slice im3D[i] of the Mamba 3D image. To achieve this, have a look on the example already cited in Nicolas' answer.
Be aware also that the horizontal size of the Mamba image is always a multiple of 64. So, if your array has a different horizontal size, it will be padded with 0. This may induce problems (edge effects) if you don't take care of this.

Once, you have a 3D Mamba image, you can apply on it the 3D watershed transform (valuedWatershed3D). The basinSegment3D or watershedSegment3D operators can not be used directly on the initial image, as they require a labelled flooding source image (generated by label3D). Here again, have a look on the documentation given in the Mamba examples:

http://www.mamba-image.org/examples/exampleM3.py
http://www.mamba-image.org/examples/exampleA11.py
http://www.mamba-image.org/examples/exampleM17.py

and also on other papers explaining how to use the watershed transformation which can be found on my web page:

http://cmm.ensmp.fr/~beucher/publi.html
http://cmm.ensmp.fr/~beucher/Mamba_documentation.html

Sincerely,

Serge

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