[Insight-users] container for iterators of images

[Hila Hiler]

Hi Alex,
first of all, many thanks for the response.

I'm afraid that you haven't noticed that I did the same as described in
your link (it was the easy part) ...
Actually my question was about a vector of iterators to itk images.
Please, read my attached code. I'll be pleased to understand what have I
missed.

Regards,
Hila


On Mon, Apr 23, 2012 at 4:08 PM, alex Dowson <alexdowson at hotmail.com> wrote:

>   Hi
>
> Look at this examples
>
>
> http://www.itk.org/Wiki/ITK/Examples/Iterators/ImageRegionConstIterator
> http://www.itk.org/Wiki/ITK/Examples/Iterators/ImageRegionIterator
>
>
>
>
>
>
>
>  *From:* Hila Hiler <hilahiler at gmail.com>
> *Sent:* Monday, April 23, 2012 5:57 PM
> *To:* insight-users at itk.org
> *Subject:* [Insight-users] container for iterators of images
>
>  Hi All,
>
> I'd like to generate a new image by summarizing some other images in the
> same dimensions.
> So I generated a new image and a std::list for the images iterators.
> (actually, I thought that this dynamic container is the best way to mange
> an unknown number of images)
>
> For now, it isn't working because I don't know how to forward the image's
> iterator from that vector. in other words, how do I do the same as:
> output_it++ from a vector?
>
> Here is my code:
>
>     typedef itk::ImageRegionIterator            <ImageType>
> iteratorType;
>     typedef itk::ImageRegionConstIterator    <ImageType>
> constIteratorType;
>
>     constIteratorType    first_it    (first_img,
> first_img->GetRequestedRegion());
>     iteratorType            output_it (output_img, output_img->
> GetRequestedRegion());
>
>     std::list<constIteratorType> list;
>     std::list<constIteratorType>::iterator it;
>
>     list.push_back(first_it);
>
>     if (second_img.IsNotNull())
>     {
>         constIteratorType second_it (second_img,
> second_img->GetRequestedRegion());
>         list.push_back (second_it);
>     }
>
>     //initialize all the iterators at the begin of input images
>     for(it = list.begin(); it < list.end(); it++)
>     {
>         it->GoToBegin();
>     }
>
>     for(output_it.GoToBegin(); !output_it.IsAtEnd(); ++output_it)
>     {
>         for(it = list.begin(); it < list.end(); it++)//move on the images
> and get at each iteration the pixel value and insert to the new image
>         {
>             output_val = it->Get() + output_val;  //get values from each
> image and insert in the output image
>             // How do I forward the image's iterator from here ?????
>         }
>
>         output_it.Set(output_val);
>
>     }
>
>
>
> Any thoughts would be very welcome ...
> Hila
>
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