[Insight-developers] Repeated ImageIO::Read calls, without ReadImageInformation?

[Matt McCormick]

Hi Mark,

There should be no modification to itk::ImageIOBase itself, only the
addition of a SCIFIOImageIO::SetSeriesIndex method.

itk::ImageFileReader is not aware of modifications that occur to the
ImageIO class, so Modified() must be called on the ImageFilterReader
after SetSeriesIndex is called on the ImageIO.  To process a series of
images, then the Video framework should be used per our previous
discussion.

Thanks,
Matt

On Tue, Jul 9, 2013 at 2:22 PM, Mark Hiner <hiner at wisc.edu> wrote:
> Hello all,
>
>  I'm trying to modify the SCIFIO-ITK ImageIO to accommodate multi-series
> datasets. I added API to the ImageIO itself allowing for series
> specification, but am not sure how to get repeated ImageIO::Read calls
> without also triggering ReadImageInformation (which I want to avoid, as it
> is an expensive operation and only needs to execute once).
>
> I have the following pipeline:
>
>  itk::ImageFileReader -> itk::StreamingImagefilter -> itk::ImageFileWriter
>
> and in a loop over the image series, I call my SCIFIOImageIO::SetSeries
> method, and then ImageFileWriter::Update() to write the current series.
>
>  But it seems like after being called once, Update() stops triggering future
> ImageIO::Read calls as long as the same ImageIO is attached to the
> ImageFileReader...
>
>  So what's the intended ITK way of updating the ImageFileReader's output,
> without re-parsing? I looked through the API docs, but nothing I've tried
> has worked... (ImageFileReader::GenerateOutputInformation calls
> ImageIO::ReadImageInformation. I'm assuming ImageFileReader::GenerateData
> would do what I want, but it's protected so I suspect there's a different
> way..)
>
> Thanks!
> Mark
>
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