[Insight-users] neighborhood iterator

[Jiao Lin]

Hi Robert,

Thanks for your quick response! That is certainly a solution. But the
SetLocation method is not optimized for speed so I wonder if there is
a better way to do it.

--Jiao

On Wed, Feb 16, 2011 at 10:11 AM, robert tamburo
<robert.tamburo at gmail.com> wrote:
> As you iterate the image, check to see if you're on the grid. If you are,
> then set and iterate the neighborhood. Something like:
> while(!it.IsAtEnd())
>   {
>   index = it.GetIndex();
>   if( (index[0] % 2 == 0) && (index[1] % 3 == 0) )  // or whatever
>     {
>     neighborhoodIt.SetLocation(index);
>     // iterateTheNeighborhood
>     .
>     .
>     .
>     }
>   ++it;
>   }
>
> On Wed, Feb 16, 2011 at 12:40 PM, linjiao <jiao.lin at gmail.com> wrote:
>>
>> Have a question regarding neighborhood iterator. My understanding is that
>> after creating a neighborhood iterator, one can move the center of a
>> neighborhood around an image region by increment the iterator:
>>
>> while (!it.IsAtEnd()) {
>>  ...
>>  ++it;
>> }
>>
>> Each increment will bring the center to the next pixel in the image
>> region.
>> I am now wondering if it is possible to define a "grid" in the image
>> region,
>> and only let the center to move to the next pixel in that grid.
>>
>> So for example, we have a 10X10 image, right now we can define a
>> neighborhood iterator whose center walks like this
>>
>> (0,0), (1,0), (2,0), .... (9,0), (0,1), (1,1) ....
>>
>> I am wondering if we can define a neighborhood iterator whose center walks
>> in 2 steps in x direction, and 3 steps in y direction
>>
>> (0,0), (2,0), (4,0), ... (8,0), (0,3), (2,3), (4,3), ...
>>
>> Any hints are very appreciated.
>>
>> --Jiao
>> --
>> View this message in context:
>> http://old.nabble.com/neighborhood-iterator-tp30936654p30936654.html
>> Sent from the ITK - Users mailing list archive at Nabble.com.
>>
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