How is Linear Contrast for Image working?

[Dongha Kang]

Hi, I am new quite new to ITKSNAP and I really do respect your work.

I am actually looking at the source code and trying to recreate some of the functions simply using Simple ITK python.

I am looking at the Image layer inspector right now. My question is what type of filter are you guys using in itk? It is hard for me to find the exact function for Linear contrast adjustment  that is directly related to image that appears. Also, there are just so many filters in ITK in general.

I eventually want to let users to decide min/max or level/window and recreate the image with different intensity

Thanks !

[Paul Yushkevich]

It's actually a mess. We use a vtk spline (vtkKochanekSpline) to do the intensity mapping. The spline is used for non-linear remapping too.

If you want to do linear mapping using pure ITK the simplest thing would be to use the itk UnaryFunctionImageFilter and supply your own function. I am not sure if this kind of customizable filter is supported in SimpleITK.

Paul.

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Paul A. Yushkevich, Ph.D.
Professor of Radiology
Penn Image Computing and Science Laboratory
University of Pennsylvania Perelman School of Medicine

[강동하]

Thank you for your reply Paul,

I guess I was just a little confused because there were so many Filter options in Simple-ITK. I will try what you suggested and will get back to you if there are more questions.

Once again, thank you so much.

Dongha

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