[Insight-developers] itkImageFileWriterPastingTest2_02 failures

[Bradley Lowekamp]

Hello Bill,

	This test is expected to fail. The output of the difference image  
does look right. However at the end of the output is the following:

MetaImage: M_ReadElements: data not read completely
    ideal = 124992 : actual = 82256
MetaImage: M_ReadElements: data not read completely
    ideal = 124992 : actual = 82256
The file is actually an invalid MetaIO file.

What the test is trying to do is paste a region to the middle of a  
image file when there is no file. The expected behavior should be to  
create a valid image file where just the pixels of the paste region  
are defined. The test in fact will need to be modified to check just  
this subregion. Unfortunately, metaio does not currently conform to  
this behavior. The way metaio currently works is to just write the  
ioregion at the appropriate spot of the file, and does not make the  
file the full valid size. It only extends the file to where the  
ioregion is. That is the file output of this test is truncated and not  
a valid file. This works when streaming the entire file, like  
itkImageFileWriterStreamingTest1 or itkImageFileWriterPasting1.

Currently, no changes have been made it itkMetaImageIO, or the  
MetaImage utility library. This was does on purpose to verify  
backwards compatibility. So incase some one had there old streaming IO  
it would still work with out modifications.

The next step is to modify MetaIO to improve it's robustness in cases  
like this and a couple other, so that it will either create a valid  
output or throw and exception.

-Brad

On Jan 24, 2009, at 8:29 AM, Bill Lorensen wrote:

> Brad,
>
> I think the failing test itkImageFileWriterPastingTest2_02
> http://www.cdash.org/CDash/testDetails.php?test=15954282&build=256618
>
> may be producing correct results. This test should paste an io region
> into a new image. Seems like it is doing that. I think that it just
> needs a valid regression image. It's companion test,
> itkImageFileWriterPastingTest2_01 pastes into an existing image. It
> passes.
>
> Comments?
>
> Bill



========================================================
Bradley Lowekamp
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine
blowekamp at mail.nih.gov

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