[Insight-users] "Topological image coordinates" ?

[Bill Lorensen]

(0,0)                (511,0)
  | - - - - - - - - - - - |
  |                       |
  |                       |
  |                       |
  |                       |
  | - - - - - -X - - - - |
(0,511)              (511,511)

On Tue, Sep 22, 2009 at 7:08 PM, motes motes <mort.motes at gmail.com> wrote:
> 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.
>>
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