[Insight-developers] ImageIO Streaming

[Hans Johnson]

Luis,

I was thinking about this also.  I would think that the answer is
"Probably".  If you write a sub-region to a new file, I think that you will
actually need to write a "LargestPossibleRegion" to make a valid file
output.  The area outside the specified region should be all zeros (or some
specified background value).  If you were writing to an existing file, then
only the voxels in the specified region should be modified in the resulting
output file.

This problem is much harder, and less likely to be needed at the moment.
I'd like to focus on just the streaming read problems for the moment.

====
It is, however, critical that the function names are changed now so that we
can maintain backwards compatibility once the file writing mechanisms are
ready to be implemented.


Hans



-- 
Hans J. Johnson, Ph.D.
Hans-johnson at uiowa.edu

278 GH
The University of Iowa
Iowa City, IA 52241
(319) 353 8587


> From: Luis Ibanez <luis.ibanez at kitware.com>
> Date: Mon, 02 Jul 2007 16:34:29 -0400
> To: Hans Johnson <hans-johnson at uiowa.edu>
> Cc: Kent Williams <norman-k-williams at uiowa.edu>, ITK
> <insight-developers at itk.org>
> Subject: Re: [Insight-developers] ImageIO Streaming
> 
> 
> Hi Hans,
> 
> Thanks for the quick answer.
> 
> I'll proceed to remove the CanStreamRead() method from the API.
> 
> On a second note, I would imagine that for writing we need a twin
> method of the DetermingStreamableRegionFromRequestedRegion().
> 
> That means that we probably should rename this method as:
> 
>    DetermingStreamableReadRegionFromRequestedRegion()
>                       ^^^^
> 
> or something along those lines.
> 
> The twin method:
> 
>    DetermingStreamableWriteRegionFromRequestedRegion()
>                       ^^^^^
> 
> Will define the smallest image region that the ImageIO object
> can write when requested to write a "RequestedRegion".  E.g.
> it will enlarge the output region to the quantum units of the
> fileformat.
> 
> 
>   Will this apply to "Nifi"  ?
> 
> 
>    Thanks
> 
> 
> 
>      Luis
> 
> 
> ---------------------
> Hans Johnson wrote:
>> Luis,
>> 
>> I fully support removing the CanStreamRead method.
>> Hans
>>