[Insight-users] "Topological image coordinates" ?

[motes motes]

After a few tests I arrive to the following conclusion:

1) "Traditionally" physical image coordinates:

 (0,512)            (512,512)
     | - - - - - - - - - - - |
     |                       |
     |                       |
     |                       |
     |                       |
     | - - - - - X  - - - - |
   (0,0)               (0,512)


2) ITK index, size and image Region:


 (0,0)                (512,0)
     | - - - - - - - - - - - |
     |                       |
     |                       |
     |                       |
     |                       |
     | - - - - - -X - - - - |
(0,512)              (512,512)

X has index (256, 512). And the specified index is the upper left
corner of the region with a specified size.

correct?






On Wed, Sep 23, 2009 at 12:46 AM, motes motes <mort.motes at gmail.com> wrote:
> In the itkSoftwareGuide page: 36 index and size for a image region is
> described. It says that:
>
>     "Index is represented by a n-dimensional array where each
> component is an integer indicating—in topological image
> coordinates—the initial pixel of the image."
>
> As I understand the following 512*512 image has these (physical) dimensions:
>
>  (0,512)            (512,512)
>      | - - - - - - - - - - - |
>      |                       |
>      |                       |
>      |                       |
>      |                       |
>      | - - - - - X  - - - - |
>    (0,0)               (0,512)
>
>
> which means that X approx. has the following (physical) index: (256, 0)
>
> Is this a correct understanding of "Topological order"?
>
> In a previous post I got some results which does not fit with the
> above definition, hopefully the above example clarifies my question.
>