[Insight-users] I want to finish a image registration with two fixed images

[Luis Ibanez]

Hi Wenyan,

The interface of this class to the optimize will still be
through the methods

GetValue( parameters )
GetValueAndDerivative( parameters )

Internally, each one of these methods will call the GetValue()
of both metrics, and the GetValueAndDerivative() of both
metrics, and presumably combine those values, for example
through a linear combination. (please be aware that the values
returned by different metrics are not necessarily in the same
scale (or numerical range) so, you may have to harmonize
their values into a common scale).

That will be a nice paper for the Insight Journal.      :-)


      Luis


----------------------------------
2010/12/12 Wenyan Chen <chenwenyan66 at 126.com>:
> Dear Luis,
>    Thanks for your reply.As you said ,if I want to write a facade
> ImageMetric class that plugs to
> two Metrics.How to dispatches the parameters from the two
> transforms(physical correspondence T of
>  two transforms is unchanged).And What are the interface of this class to
> link to the optimizer?
> thanks all.
>
>
>
> At 2010-12-10 18:36:11，"Luis Ibanez" <luis.ibanez at kitware.com> wrote:
>
>>Hi  陈雯艳,
>>
>>Are you trying to register multiple images simultaneously ?
>>
>>If so, you may want to take a look at:
>>
>>http://svn.na-mic.org/NAMICSandBox/trunk/MultiImageRegistration/
>>
>>---
>>
>>currently there is not a direct way in ITK to
>>pass two metrics to the same optimizer.
>>
>>If you don't mind writing new code, you could
>>write a facade ImageMetric class that plugs to
>>two Metrics and dispatches the parameters
>>from the two transforms.
>>
>>We can give you more details if you are interested.
>>
>>
>>    Regards,
>>
>>
>>         Luis
>>
>>-------------------------------------------------------
>>2010/12/6 陈雯艳 <chenwenyan66 at 126.com>:
>>> dear all:
>>>
>>> I want to finish a image registration with two fixed images.The physical
>>> correspondence T between the two fixed images is known.
>>> Two metrics are declared,I set the initial transform parameters for the
>>> first one,then the transfrom parameters for the other one will be
>>> set automatically( by calculating the physical correspondence T).
>>> But I don't konw how to connect the two metrics with a optimizer.(makes
>>> metric value1+value2 the maximum)
>>> Any help you could provide me will be greatly appreciated.It will be the
>>> best if you can attach a simple piece of code to indicate that.
>>>
>>> thanks all.
>>>
>>>
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