CODEWITHSUNDEEP
c++vtkitk
matlab user
matlab user

Reputation: 79

Manipulate Nifti image using ITK

I am trying to write a simple program to read or visualise nifti image using ITK libraries.

  using PixelType = unsigned char;
  using ImageType = itk::Image< PixelType, Dimension >;
  using ReaderType = itk::ImageFileReader< ImageType >;
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(argv[1]);
  reader->Update();
  ImageType::Pointer image = reader->GetOutput();

From these code lines, I can access number of dimensions, and pixel type. But, I am still lost how I can access the pixels values of the image? I imagine I should have 3D array contains different values of pixels (which represents the nifti image). Which methods I should address?

Also, I have tried to use VTK to visualize the image, and create new format (PNG, or PPM) for the image, but I couldn't do it. Any code example is much appreciated. Thank you!

Edit:

I can now get the pixel values after casting the DS PixelType to int. Thank you.

But, When I used the class ImageToVTKImageFilter.cxx, I got the screenshot attached, where I can't see any image. And it gets brighter if I moved the mouse over it. Do you have any explanation for that?

image visualization

Upvotes: 1

Views: 754

Answers (1)

Dženan
Dženan

Reputation: 3395

You should read ITK software guide, section 4.1.3 Accessing Pixel Data [link]. Example of reading and visualizing a 2D image. Another example (probably supports 3D images).

Upvotes: 1

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