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

[Dženan Zukić]

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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