[ITK] [ITK-users] region of interest size problem

[Dženan Zukić]

Hi Oscar,

if you want to copy part of the image, and have the rest be filled with
zeroes, you should:

   1. create a new image
   2. copy information from the source image
   3. set regions using source's region
   4. allocate(true)
   5. use PasteImageFilter
   <https://itk.org/Doxygen/html/classitk_1_1PasteImageFilter.html> to copy
   a portion of source to the new image

Does this answer your question?

Regards,
Dženan

On Mon, Jul 18, 2016 at 3:01 PM, Oscar Cuadros Linares <ocuadrosl at gmail.com>
wrote:

> Hi Dženan Zukić
>
> Thank you for your reply.
> I know that a 3D input produces a 3D output. I will try to explain better
> my issue.
> I have a 3D image and I want to get to a ROI (200x200x100 size) from that
> image.
> But the output image has to keep the original information, especially the
> region size.
> (400x400x550 in my case). The problem is that the output image is
> 200x200x100 size
> and not 400x400x550 like the input image.
>
> Thank you so much.
> Oscar
>
>
>
> On Sat, Jul 16, 2016 at 10:52 AM, Dženan Zukić <dzenanz at gmail.com> wrote:
>
>> Hi Oscar,
>>
>> the output dimension is the same: 3D input produces 3D output, 2D input
>> produces 2D output etc. But the point of RoI filter is to get an image
>> which is only a part of the input image, and in that respect the filter is
>> working correctly. What did you expect to happen? If you want only part of
>> the image be processed, set its RequestedRegion to something smaller than
>> LargestPossibleRegion.
>>
>> Regards,
>> Dženan
>>
>> On Fri, Jul 15, 2016 at 6:04 PM, Oscar Cuadros Linares <
>> ocuadrosl at gmail.com> wrote:
>>
>>> Hi Guys
>>>
>>> I am trying to extract a region of interest (ROI) from a 3D tomography
>>> I am using the filter  "itkRegionOfInterestImageFilter.h". The issue is
>>> that the filter changes the original size of the input image.
>>> According the documentation, the output image has the same
>>> dimension of the input image. But size of the output image
>>> is the size of the selected region (ROI).
>>> My code is based on this example:
>>>
>>> https://itk.org/Wiki/ITK/Examples/ImageProcessing/RegionOfInterestImageFilter
>>>
>>> Thank you for your suggestions
>>> Oscar
>>>
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>>
>>
>
>
> --
> Oscar Cuadros Linares
> Computer Science
>
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