[Insight-developers] function to compare image information?

[Bradley Lowekamp]

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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