affineInitializer.Rd
Searches over the sphere to find a good initialization for further registration refinement, if needed. This is a wrapper for the ANTs function antsAffineInitializer.
affineInitializer(
fixedImage,
movingImage,
searchFactor = 20,
radianFraction = 0.1,
usePrincipalAxis = FALSE,
localSearchIterations = 10,
mask,
txfn,
num_threads = 1
)
the fixed reference image
the moving image to be mapped to the fixed space
degree of increments on the sphere to search
between zero and one, defines the arc to search over
boolean to initialize by principal axis
gradient descent iterations
optional mask to restrict registration
filename for the transformation
will execute
Sys.setenv(ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS = num_threads)
before
running to attempt a more reproducible result. See
https://github.com/ANTsX/ANTs/wiki/antsRegistration-reproducibility-issues
for discussion. If NULL
, will not set anything.
transformationMatrix
See https://github.com/ANTsX/ANTs/issues/444 for reproducibility discussion
fi <- antsImageRead(getANTsRData("r16"))
mi <- antsImageRead(getANTsRData("r27"))
tx <- affineInitializer(fi, mi)
mi2 <- resampleImage(mi, c(1.25, 1.25))
tx <- affineInitializer(fi, mi2)
tx2 <- affineInitializer(fi, mi2)