ITK metrics direct application

Engineering
1

Hey Guys!

I’d like to hear form you if it is possible to apply itk similarity metrics (derived from itkImagetoImageMetric.h) directly for two images.

The thing is: I’d like to used different similarity metrics to measure the similarity degree between tow images registered with different techniques.

I tried something like creating a metric, setting moving image and fixed image, and triggering Update(), but did not work.

Any clue?
Thanks

2

How about calling GetValue()?

3

I tried… But did not work…
In fact, ImageToImageMetrics do no have Update() methods.
I then called GetValue() directly.
It outputs the following error:

terminate called after throwing an instance of 'itk::ExceptionObject'
what():  /home/leonardo/General-Sources/ITK- 
5.0.0/Modules/Numerics/Optimizersv4/include/itkObjectToObjectMetric.hxx:415:
itk::ERROR: MachadoMutualInformationImageToImageMetricv4(0x3155770): m_VirtualImage is 
undefined. Cannot return region. 
The program has unexpectedly finished.
4

You might need to set some transform(s), even if it is identity.

5

Also these topics might be interesting:

1 Like
6

The Compute Mean Squares Metric Between Two Images example may be helpful.

2 Likes
7

Great!!!
I guess that is exactly what I was looking for.

Thanks guys!

1 Like
8

It worked… Uhul!

In the RegistrationV4 examples, usually, they do not set interpolator. Does the default interpolator is the linear one?

9

Linear interpolator is the default one, if there is a default.

2 Likes