[Insight-users] Moving image and fixed image

[Bjorn Hanch Sollie]

Hi all!

"Moving image" and "fixed image" are terms used by the ITK
registration framework to denote the two images to be registered.
Unfortunately, there is contradictory usage of the two terms in the
documentation, as it is not clear what image is transformed to the
other. In the description of ImageRegistrationMethod
(http://www.itk.org/Doxygen/html/classitk_1_1ImageRegistrationMethod.html)
it reads:
"This class uses the coordinate system of the Fixed image and searchs
for a transform that will map the Moving image on top of the Fixed
image."

In the description of MutualInformationImageToImageMetric, however
(http://www.itk.org/Doxygen/html/classitk_1_1MutualInformationImageToImageMetric.html)
it reads:
"The Transform is used to map points from the fixed image to the
moving image domain."

Can anyone please explain what is correct usage of these terms?  What
image is mapped to the other?  (And what is the correct usage in the
case of MutualInformationImageToImageMetric?)

Thanks in advance!

-Bjorn
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