iMath

Perform various (often mathematical) operations on the input image/s. Additional parameters should be specific for each operation. See the the full iMath in ANTs, on which this function is based.

iMath(img, operation, param = NULL, ...)

Arguments

img

input object, usually antsImage

operation

a character string e.g. "GetLargestComponent" ... the special case of "GetOperations" or "GetOperationsFull" will return a list of operations and brief description. Some operations may not be valid (WIP), but most are.

param

... additional parameters

...

further parameter options

Author

JT Duda

Examples

fi <- antsImageRead(getANTsRData("r16"), 2)
mask <- getMask(fi)
op1 <- iMath(fi, "GD", 1) # gray matter dilation by 1 voxel
op2 <- iMath(mask, "D") # distance transform
op3 <- iMath(0, "GetOperations") # list all ops

if (usePkg("magrittr")) { # string ops together
  lapgd <- fi %>%
    iMath("Laplacian", 1) %>%
    iMath("GD", 3)
}
# Canny is useful e.g.
# canny = ( iMath(myreg$warpedmovout,"Normalize")*255 ) %>% iMath("Canny",1,5,12)
tf <- getANTsRData("r27")
tem <- antsImageRead(tf)
mask <- tem > 20
fh <- iMath(mask, "FillHoles") # list all ops
stopifnot(range(fh) == c(0, 1))
filled <- fh > 0