voxelToWorld: Transform points between voxel and ``world'' coordinates
Description
These functions are used to transform points from dimensionless pixel or
voxel coordinates to ``real-world'' coordinates, typically in millimetres,
and back. Actual pixel units can be obtained using the
pixunits function. The origin function gives the voxel
coordinates of the real-world origin.
Usage
voxelToWorld(points, image, simple = FALSE, ...)
worldToVoxel(points, image, simple = FALSE, ...)
origin(image, ...)
Value
A vector or matrix of transformed points.
Arguments
points
A vector giving the coordinates of a point, or a matrix with
one point per row.
image
The image in whose space the points are given, or a 4x4 numeric
xform matrix.
simple
A logical value: if TRUE then the transformation is
performed simply by rescaling the points according to the voxel dimensions
recorded in the image. Otherwise the full xform matrix is used.