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

[Andrew Harris]

Sorry again for the delay, we determined the images we were creating were
too big so we created a smaller phantom image, attached.  In addition,
there is a main() function in CorrelationTest.cpp that runs the correlation
and outputs it to  a file called observer.txt, and I have included the most
up-to-date versions of my class and header files.  The function is
expecting the phantom to exist in a folder at c:/Scans/Phantom.  Let me
know if you need further info, and thanks again for your help.​
 SmallPhantomBox.raw
<https://drive.google.com/file/d/0B_DYTA-i186ZenpOTzUxekVhaU0/view?usp=drive_web>
​​
 CorrelationTest.cpp
<https://drive.google.com/file/d/0B_DYTA-i186ZT3pjaWtrbkRzeFE/view?usp=drive_web>
​​
 Correlator3D.cpp
<https://drive.google.com/file/d/0B_DYTA-i186ZM3dwRXNiU1JEems/view?usp=drive_web>
​​
 Correlator3D.h
<https://drive.google.com/file/d/0B_DYTA-i186ZQ25EbjMtZkxJVlU/view?usp=drive_web>
​

--

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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