im3d-coords: Interconvert pixel and physical coordinates

In nat: NeuroAnatomy Toolbox for Analysis of 3D Image Data

Interconvert pixel and physical coordinates

Description

xyzpos converts pixel coordinates to physical coordinates

ijkpos converts physical coordinates to pixel coordinates

Usage

xyzpos(d, ijk)

ijkpos(d, xyz, roundToNearestPixel = TRUE)

Arguments

d	An im3d object defining a physical space
ijk	an Nx3 matrix of pixel coordinates (1-indexed)
xyz	Nx3 matrix of physical coordinates
roundToNearestPixel	Whether to round calculated pixel coordinates to nearest integer value (i.e. nearest pixel). default: TRUE

Value

Nx3 matrix of physica l or pixel coordinates

See Also

ind2coord

Other im3d: as.im3d(), boundingbox(), im3d(), im3d-io, imexpand.grid(), imslice(), is.im3d(), mask(), origin(), projection(), threshold(), unmask(), voxdims()

Examples

# make an emty im3d
d=im3d(,dim=c(20,30,40),origin=c(10,20,30),voxdims=c(1,2,3))
# check round trip for origin
stopifnot(all.equal(ijkpos(d,xyzpos(d,c(1,1,1))), c(1,1,1)))

nat documentation built on Aug. 18, 2025, 5:20 p.m.