getNeighborhoodAtVoxel.Rd
Get the values in a local neighborhood of an antsImage
.
getNeighborhoodAtVoxel(image, center, kernel, physical.coordinates = FALSE)
image | Image object of S4 class |
---|---|
center | array of indices for neighborhood center |
kernel | either an array of values for neighborhood radius (in voxels) or a binary array of the same dimension as the image, specifying the shape of the neighborhood to extract |
physical.coordinates | a logical indicating if voxel indices and offsets should be in voxel or physical coordinates |
a list
valuesnumeric vector of values
indicesmatrix providing the coordinates for each value
img<-makeImage(c(10,10),rnorm(100)) center <- dim(img)/2 radius <- rep(3,2) nhlist <- getNeighborhoodAtVoxel(img,center,radius) kernel <- 1*(rnorm(49)>0) dim(kernel) <- c(7,7) randlist <- getNeighborhoodAtVoxel(img,center,kernel) randlist <- getNeighborhoodAtVoxel(img,center,kernel, physical.coordinates = TRUE) arr = as.array(img) testthat::expect_error(getNeighborhoodAtVoxel(arr,center,kernel), "class") testthat::expect_error(getNeighborhoodAtVoxel(img,as.character(center),kernel), "center must be") testthat::expect_error(getNeighborhoodAtVoxel(img,center,c(radius, 3)), "kernel must have same")