[Insight-developers] Re: Creating large images

[Richard Beare]

Hi,

I've managed to get what I was after using RegionOfInterest and
PasteImageFilter. It doesn't feel particularly efficient, but it seems
to work.

On 12/5/05, Richard Beare <richard.beare at gmail.com> wrote:
> Hi,
> Sorry if I'm being very thick, but I haven't been able to find out how
> to do this at the filter level - maybe it is only possible if I write
> a new filter.
>
> Here's the problem. Basically I'd like to assemble a large image that
> is going to be the start of a pipeline. I'll know how big the image
> will be, so I can create it in advance. My problem seems to be getting
> a pre-allocated image to act as a mapper.
>
> Here are some schematics of the sort of structure I have in mind:
>
>   -----         ------    ...     -------      ------       : n small images
>     |               |        ...        |              |
>     |               |                   |              |          :
> pre processing pipelines
>     \               |                   |             /
>        --------------------------------                   : One large image
>                              |
>                              |                                    :
> Further processing
>
> Where the pre-processing pipelines may be logically parallel or
> created and run serially.
>
> I had hoped to do this be allocating the large image, setting the
> requested region to match the size of the small image and have the
> start index I wanted and then connect it to the end of the
> preprocessing pipeline. However I can't see any way to make a
> pre-allocated image act as a mapper.
>
> One alternative I can see at the moment is to pad each small image
> with zeros so that they have the desired output size and the input
> image is in the correct and then accumulate them, which seems a fairly
> round about and inefficient way to go.
>
> The registration framework will probably need to deal with similar
> problem if it gets used to assemble mosaics.
>
> So, what am I missing here? Is a new filter necessary, or is there
> some other way to put the output of a pipeline in a specific location
> in a preallocated image?
>
> All advice welcome.
>
> Thanks
>