[Insight-users] Question: Deformation fields

[Karthik Krishnan]

It is infact there in the SWGuide. Look at the 2.0 draft version. at 
http://itk.org/HTML/Documentation.htm. Page 366 Sec 8.14.

Here's how to visualize 2D fields.

1. Load the image in Paraview.
2. Click on Filter->Calculator
Specify an equation to create vector data from 2 component images:
        iHat*ImageFile_0+jHat*ImageFile_1
[ ImageFile_0 and ImageFile_1 are the two components of the field. You 
will find them in the Scalars button the Calculator widget ]
3. Filter->Glyph     [ You may want to reduce the maximum number of 
glyphs from the default 5000 to 500 or some number less dense ]

karthik



Vishal Majithia wrote:

>Karthik,
>
>Thanks for the reply. That is the exact problem I
>have. I went through the ITK software guide, as well
>as the Paraview user's guide v. 1.6, and could not
>find anything addressing the 2-D deformation field
>calculations. I also looked through some of the
>mailing list archives, but did not see this question
>addressed.
>Please let me know how to solve this, or at least
>where to find the solution.
>
>Sincerely,
>Vishal Majithia
>
>
>--- Karthik Krishnan <Karthik.Krishnan at kitware.com>
>wrote:
>
>  
>
>>Could you describe in detail how you are visualizing
>>the deformation 
>>field in Paraview. Please read the section on the
>>SoftwareGuide titled 
>>"Visualizing 2D Deformation fields" in Paraview.
>>
>>[ I assume you are loading the file and glyphing it
>>right away. That 
>>would glyph the magnitudes of the field vectors,
>>which being scalars 
>>would point right/left. You need to use the
>>calculator to convert this 
>>to a 2 D vector field and glyph that. More in the
>>guide..... ]
>>
>>Karthik
>>
>>
>>Vishal Majithia wrote:
>>
>>    
>>
>>>Hi,
>>>
>>>I have used the FEM and Demon's registration
>>>      
>>>
>>programs,
>>    
>>
>>>based on those in the examples, for doing 2-D image
>>>registration. My problem is that when I view the
>>>      
>>>
>>image
>>    
>>
>>>in  Paraview, the vectors only point to the left
>>>      
>>>
>>and
>>    
>>
>>>right, which is not correct. I know the deformation
>>>fields are correct, since I can apply them in the
>>>      
>>>
>>same
>>    
>>
>>>program and get good results. I would appreciate
>>>      
>>>
>>any
>>    
>>
>>>help or suggestions on this. Thank you.
>>>
>>>Sincerely,
>>>Vishal Majithia
>>>
>>>
>>>
>>>		
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>
>
>
>		
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