[Insight-users] add and remove subimages

[Luis Ibanez]

Hi David,

Thanks for the clarifications. They are very helpful.


There is not quite a filter in ITK that will do exactly what you describe.

However, you could write such filter by using existing ones as helpers.

but...

before you go down that route, please note that your operations
will be almost trivial with an image that supports sliced-based
memory allocation, such as the one described in the following
Insight Journal paper:

        http://www.insight-journal.org/browse/publication/646


---

If you prefer to follow the route of writing a new ITK filter,
we will be happy to assist you in the process, and of
course we will strongly encourage you to share the resulting
code with the ITK community by submitting it as a paper
to the Insight Journal:

          http://www.insight-journal.org/



     Regards,


          Luis


------------------------------------------------------------------------------------------------------
On Wed, Dec 2, 2009 at 7:02 AM, David Pastor <david.pastor at die.upm.es> wrote:
> Hi Luis,
>
> It would be at the end or at the beginning. In this case I just pretend to
> insert and remove images without arithmetic operations.
>
> And certainly the image size should be updated after the removal or the
> insertion (no substitutions or holes are expected either).
>
> So basically I need insertion and deletion of N-1 D images into/from N D
> images and adjust the origin and size of the resulting N D image (end and
> beginning)
>
> I imagine than deletion can be achieved by selecting an interest region and
> then adjust the origin.
> Insertion might be more tricky.
>
> It would be nice to have some general insertion/deletion/replacement methods
> though.
>
> Another issue would be if we can work with negative index positions. The
> point is that I need markers to be placed outside the LargestPossibleRegion,
> so i have to make the image size grow without affecting the content more
> than a shift in the growing dimension in respect of the new origin.
>
> I hope this is clearer now.
>
> thanks
> david
>
> ----- Original Message ----- From: "Luis Ibanez" <luis.ibanez at kitware.com>
> To: "David Pastor" <david.pastor at die.upm.es>
> Cc: <insight-users at itk.org>
> Sent: Wednesday, December 02, 2009 1:28 AM
> Subject: Re: [Insight-users] add and remove subimages
>
>
> Hi David,
>
> By "Add" do you mean to "insert" a N-D image into a (N+1)-D image ?
>
> or do you actually mean to perform an arithmetic addition between
> the pixel values of the N-D image and the corresponding sub-region
> of the (N+1)-D image ?
>
>
> Do you need to do this many times ?
>
> Would you be adding and removing always at the end ?
> like a FIFO queue ? or do you plan to insert and remove
> from arbitrary locations ?
>
> ... then default method that comes  to mind, will not
> be an efficient way of doing this for many insertions
> and deletions...
>
> Also, please clarify if when you insert you want the new data
> to replace a pre-existing region of the N+1 D image, or you
> want the image to expand in extent.
>
> Same for the removal: do you want to extract regions from
> the N+1 D image and leave the original image untouched,
> or do you want to also get a reduced (smaller) version of
> the N+1 D image, that now is missing the N-D image that
> you extracted.
>
>
>  Please let us know,
>
>
>           Thanks
>
>
>
>                Luis
>
>
>
> --------------------------------------------------------------------------------------------
> On Mon, Nov 30, 2009 at 6:40 AM, David Pastor <david.pastor at die.upm.es>
> wrote:
>>
>> Hello,
>>
>> I'd like to add an n dimensional image to a n+1 dimensional image. Also i
>> would like to be able to remove selected subimages.
>>
>> I'm not sure if i can use TileImageFilter for that as the InputImages
>> would
>> have different dimensions.
>>
>> pushbackinput(4d image)
>> pushbackinput(3d image)
>>
>> out-> 4d image
>>
>> is this possible? any specific layout for it? even it would be great to be
>> able to set the 3d image in any point of the 4d image like an
>> interleaving.
>>
>> I don't know if ExtractImageFilter could be used for the opposite either.
>>
>> Cheers,
>> D. Pastor
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>
>