[vtkusers] Re: Help needed using segmented data

[Vidya Raghavan]

Hi Goodwin,

Thanks for replying. Basically I need to be able to read in the segmented 
data and model it (like the frog example) using the VTK pipeline process. 
So, does ITK now suppport this or should I be using VTK itself. I'm a little 
confused here.

The frog example reads in data like:

P5
# pgm file written by the visualization toolkit
500 470
255


I don't see any information about segmented pixels at all here. So how does 
the program read it and render it?

All I need is a nice approach to be able to read in my slices and to be able 
to render a model of that data. Should I be looking at other examples? I 
just thought that the frog examples seemed to be in line with what I want. 
Please clarify.

Thanks!

>From: "Goodwin Lawlor" To: vtkusers at public.kitware.com Subject: [vtkusers] 
>Re: Help needed using segmented data Date: Tue, 27 Jul 2004 04:48:17 +0100
>
>Vidya,
>
>The problem is with your data... its in ascii format, with characters 
>(numbers) delimited by spaces. You could use the data mask in the reader to 
>cut out the spaces and the use vtkImageShiftScale to move "0" down from 48 
>in the ascii table. Something like this:
>
>vtkImageReader reader     reader SetFilePrefex c:/data/bmp     reader 
>SetDataExtent 0 255 0 255 1 9     #even though data is uchar, read in two 
>bytes     reader SetDataScalarTypeToShort     #chop the space out     
>reader SetDataMask 0x00FF     reader SetDataByteOrderToLittleEndian
>
>vtkImageShiftScale shift     shift SetInput [reader GetOutput]     shift 
>SetShift -48
>
>... ...
>
>Or you could just use vtkBMPReader on the original images.
>
>
>Segemented8.tcl, Segemented16.tcl and the frog example (all around vtk 2.0, 
>I think) used to be good examples but were axed- perhaps they were moved 
>over to itk...
>
>
>hth
>
>Goodwin
>
>"Vidya Raghavan" wrote in message 
>news:BAY2-F8D4F8jvj5SxW3000156d7 at hotmail.com... > Dear VTK users, > > I had 
>posted this question earlier, but didn't get any response yet. So, I'm > 
>reposting it. Hope someone can help me. > > Basically, I am trying to model 
>segmented data in VTK, based on the tutorial > provided in: > > 
>http://www.crd.ge.com/~lorensen/seg12/, where the input data is described 
>as > "a set of slices that have the same resolution as the original data, 
>but > grayscale values have been replaced with integer segmentation 
>labels.". > > There were some errors in the scripts as they used an older 
>verison of VTK. > I now have these scripts working for VTK 4.2 and there 
>are at > http://www.cs.northwestern.edu/~vidya/VTK/scripts > > Now I am 
>trying to use my own segmented data with the above scripts, where > they 
>represent 256 X 256 segmented data, with each pixel represented by an > 
>integer. > > The segmented data I have used is at: > 
>http://www.cs.northwestern.edu/~vidya/VTK/data > > The script I have 
>written to describe these parameters is region1.tcl > > When I run 
>region1.tcl I should get a vtk file region1.vtk. Instead it is > empty and 
>no polygons are generated. I am really trying to understand what > is 
>wrong, but since I'm new to VTK I still cannot figure it out. > > Could 
>someone please help? > > Thanks. > > 
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