[ITK-users] [ITK] CorrelationImageToImageMetricv4 returns 0 from GetValue()

[Andrew Harris]

Thanks for getting back to me.  I know the approach isn’t ideal, I’m
building my class on top of an existing project, so that’s the reason for
using the primative types.  I’m going to write a main function as well as
sending you a data set so that you can skip figuring out how to get data in
to the class and can focus directly on the problem, should have both the
program and data to you by the end of the day.  Thanks again.

--

AH


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On Tue, Aug 23, 2016 at 9:53 AM, Dženan Zukić <dzenanz at gmail.com> wrote:

> Hi Andrew,
>
> you are doing so many things in a nonstandard way, starting with passing
> around pointers to buffers and metadata as plain parameters, instead of
> just once converting to itk::Image and then using itk::Image::Pointer to
> pass the images around. Your approach is more prone to errors.
>
> Can you provide the inputs and the main function which invokes this class
> to have a runnable example? I will try to find the problem.
>
> Regards,
> Dženan
>
> On Mon, Aug 22, 2016 at 3:25 PM, Andrew Harris <aharr8 at uwo.ca> wrote:
>
>> Hello all,
>> I am having a devil of a time setting up the
>> CorrelationImageToImageMetricv4 and getting a result that makes sense.
>> I have written an observer that outputs to a text file the iteration
>> number, correlation value, and current position.  I have generated a
>> virtual phantom image of a white cube on a black background, and when I put
>> the same image through for fixed and moving images, I get [0,0,0,0,0,0],
>> meaning that no rotation or translation is required for the images to be
>> aligned.  This is the correct versor and vector transform, and if I apply a
>> translation the correct distance values are returned to have the images
>> align, however the metric value returned is also 0 and a perfect
>> registration like this should yield a metric of -1 according to the
>> documentation.  Additionally, it doesn’t seem to be analyzing rotation
>> properly, as when I introduce a rotation around any axis the metric returns
>> a translation on the other two axes but the rotation versor remains at zero.
>>
>> I’m attaching my code as well, it’s possible I’ve not set some parameters
>> up properly:
>>
>>
>> --
>>
>> AH
>>
>>
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