[Insight-developers] function to compare image information?

[M Stauffer (V)]

Thanks Brad, that's very helpful. I don't have any preference for the
name.

We also need to compare buffered regions to make sure they're the same
so we can do direct indexing over both regions with the same iterator.
But that seems like that should be in a different method since it's not
about physical space, or it should be just done manually when needed by
a user class?

-Michael

>-----Original Message-----
>From: Bradley Lowekamp [mailto:blowekamp at mail.nih.gov] 
>Sent: Tuesday, July 19, 2011 4:38 PM
>To: M Stauffer (V)
>Cc: ITK-dev-list-mstauff at ver
>Subject: Re: [Insight-developers] function to compare image 
>information?
>
>Hello,
>
>The recent addition you are likely thinking of is the 
>ImageToImageFilter::VerifyInputInformation method.
>
>It implements its own version of comparing Spacing Origin and 
>Direction. It utilizes some vnl methods for tolerant 
>comparisons. Jim Miller implemented it used those as I have 
>never seen them before myself. 
>
>I would very much be in favor have having a method ( some 
>place ), which performs this comparison. It would be very 
>beneficial to have this done in a central location too. And 
>when it's implemented VerifyInputInformation should use it as well.
>
>ImageBase seems like a sensible location for the method to me. 
>What method name and parameters are you thinking about?
>
>Brad
>
>On Jul 19, 2011, at 3:12 PM, M Stauffer (V) wrote:
>
>> Hi,
>> 
>> I'm looking for a method or class to test whether the image 
>information
>> (buffered region, spacing, direction, origin) is the same between two
>> image, within some epsilon. Is there something already?
>> 
>> If I need to make my own, should I put it in ImageBase, where I see
>> CopyInformation?
>> 
>> And is there an ITK-way I should do a comparison within epsilon? I
>> remember seeing some discussion about this on the list 
>recently, but it
>> didn't seem settled.
>> 
>> Our goal is to be able to compare the domains of a 
>deformation field and
>> an image to decide when we can do some optimized 
>transformations. That
>> is, when the domains are the same, we can perform 
>transformation over an
>> input domain more quickly.
>> 
>> Thanks.
>> 
>> -M
>> 
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