[Insight-users] itk::GradientDifferenceImageToImageMetric

[Damiaan Habets]

Hi,

  I've been trying to use it, but it has several long standing bugs in it.
I have a version I'm verifying right now and could contribute back once
I confirm I didn't make it worse ;)

How do I contribute fixes/changes anyways?

If you're in a rush:

- there's a coding error or two; one is using
m_MinFixedGradient[iDimension] without setting it's value; I'll have to
check on the other one.
- the calculating of the scaling s isn't done correctly (I think); and
- there's some question in my mind as to what variance is calculated.

I have the papers it's based on and it isn't 100% clear to me if the
variance should be taken over both fixed and moving image or fixed only.

Thanks,
Damiaan

> Hi ITK,
>
> I've gotten several emails from other people also curious on how to use
> this metric, but I haven't heard from anyone who knows how to do so!  Has
> anyone used this before?
>
> Kathy
>
>
> On Sun, 4 Jun 2006 smythek at u.washington.edu wrote:
>
>> Hi ITK,
>>
>> I tried to follow the test example of the GradientDifference metric
>> (after just
>> trying to plug it in where I had the NormalizedCorrelation and getting
>> metric
>> values of INF all the time), but it won't run: I get an access violation
>> reading error at the line:
>>
>> metric->GetValueAndDerivative (parameters, value, derivatives);
>>
>> I really just want to use the metric in my registration;  can anyone
>> tell me
>> how it should be integrated??
>>
>> Kathy
>>
>> On Fri, 2 Jun 2006, k s wrote:
>>
>>> Hi ITK,
>>>
>>> I have registered images using NormalizedCorrelationImagetoImageMetric,
>>> and
>>> now I'd like to try this instead.  But I don't know how to use it.
>>> Does
>>> anyone know the parameters of the
>>> itk::GradientDifferenceImageToImageMetric
>>> I need to set, and is its place in the imageRegistrationMethod any
>>> different
>>> than how I'd use the NormalizedCorrelation?
>>>
>>> Thanks!
>>>
>>> Kathy
>>>
>>
>>
>> _______________________________________________
>> Insight-users mailing list
>> Insight-users at itk.org
>> http://www.itk.org/mailman/listinfo/insight-users
>>
>
>
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
>