Load image to a model

Development
1

Hi all,
Sorry to bother you with my question. I’m new to Slicer and I’m trying to write a scripted python module. I’m trying to recognize MRI images by a deep-learning model. I have already loaded my model and I’m now trying to load my image to my module. My image is a single image in jpg format. I tried this:

name=slicer.mrmlScene.GetNodeByID(imagename)
img=cv2.imread(name)
x = cv2.resize((img), (224, 224), interpolation=cv2.INTER_CUBIC) / 255.0

it didn’t work, I don’t think it read the image.What is the correct way of implementing this?(by the way, I have already installed cv2)

Thanks,
Alex

2

You’ve got a couple options.

Read the file directly from disk (not recommended), using conventional cv2.imread(<fullPathToFile>)

If you’ve loaded the image into Slicer, then you can do

import cv2
from vtk.util import numpy_support

imageNode =  slicer.util.getNode('<nameOfJpgImageWithoutExtension>')
vtk_image = imageNode.GetImageData()
np_image = numpy_support.vtk_to_numpy(vtk_image.GetPointData().GetScalars())
dims = vtk_image.GetDimensions()
np_image.reshape(dims[0], dims[1], dims[2])

See this link https://stackoverflow.com/questions/12754971/how-to-convert-a-3d-vtkdataset-into-a-numpy-array for more information.

cv2 python bindings use numpy arrays as their images.

3

You can also load an image directly to a volume node:

volumeNode = slicer.util.loadVolume('path/to/myimage.jpg')