[Insight-users] Demon's Registration Question

[Karthik Krishnan]

Hi Vishal,

Thanks for pointing this out. Both the fourth and the fifth parameters 
spit out the deformation field. The fifth parameter is really redundant, 
which is why it wasn't added to the command line tags in the header.

By looking at the code,
For 2D images, the fourth and the fifth fields are the same, except that 
the fourth field returns the deformation field as a 2D vector image and 
the fifth writes it out as a 3D vector volume, with the third components 
set to 0, (maybe some readers allow you to visualize vector fields only 
if they are volumes).
If you replace the dimension from 2 to 3, you shouldn't use the last 
parameter since the fourth parameter will write out the deformation 
field as a volume anyway. Besides the fifth parameter, which uses a 2D 
iterator to iterate over the vector image it intends to convert to a 
vector volume will segfault, since you already have a vector volume.

In any case I am not sure what the utility of the last parameter is and 
I shall get rid of it (if there are no objections).

Thanks
regards
karthik

Vishal Majithia wrote:

>I am implementing the Demon's Registration algorithm
>that comes with ITK. I am using it to register 3D
>images. I have my deformation field type as a 3
>dimensional field. My goal is to write out the
>deformation fields. What are the fourth and fifth
>input parameters that the demon's application can
>take? When I use the fourth one, it simply gives me my
>registered image. When I use the fifth one, I get a
>segmentation fault.
>
>
>
>
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