[vtkusers] Linear Interpolation on 3D image data

[Kang, Sukryool]

Hi everyone,

I am trying to do linear interpolation on 3D image data.
I have used mechanically scanned ultrasound images to construct 3D volume. Ultrasound probe is mounted on the linear stage. I am getting exact positions along the stage movement direction (Z axis).
The 2D images are aligned along X and Y axes. I have saved stack of 2D images as vtkimagedata without the stage location information (Z values).

The problem is that the 2D ultrasound images are not even distributed along Z axis. I want to do linear interpolation along the Z axis to construct structured 3D image data.
Actually, I need to do 1 dimensional linear interpolation along the Z axis. I don't need to do any interpolation along X and Y axes.

I can do the 1D linear interpolation along the Z axis. The image resolution is about 800 x 780 x 250.
If I do the linear interpolation of 800x780 pixels along the Z axis, it takes some time. I am doing a real time visualization.
Is there any way to do linear interpolation fast using VTK?

Thank you for your help.

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