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.help im3dtran Jan97 images.imgeom
.ih
NAME
im3dtran -- Transpose a 3D image
.ih
USAGE
im3dtran input output
.ih
PARAMETERS
.ls input
The input 3d image.
.le
.ls output
The output transposed 3D image. If the output image name is the same as
the input image name then the original image will be overwritten. The number
of output images must equal the number of input images.
.le
.ls new_x = 3
The new x axis. The default (3) replaces new x with old z.
.le
.ls new_y = 2
The new y axis = old axis. The default (2) does not change the y axis.
.le
.ls new_z = 1
The new z axis. The default (1) replaces new z with old x.
.le
.ls len_blk = 128
The size in pixels of the linear internal subraster. Im3dtran will try to
transpose a subraster up to len_blk cubed at one time. Runtime is much
faster with larger \fBlen_blk\fR, but the task may run out of memory.
.le
.ls verbose = yes
Print messages about actions taken by the task.
.le
.ih
DESCRIPTION
IM3DTRAN transposes the input images \fIinput\fR in 3 dimensions and
writes the transposed images to \fIoutput\fR. The 6 possible axis
mappings are specified by setting the parameters \fInew_x\fR, \fInew_y\fR,
and \fInew_z\fR.
IM3DTRAN can be used to rotate a datacube 90 degrees in any direction by
combining the transpose operation with an axis flip. For
example, Consider a datacube is visualized with its origin at the lower
left front
when seen by the viewer, with its abscissa being the x axis, its ordinate
the y axis, and its depth the z axis, with z increasing away from the viewer
or into the datacube [this
is a left-handed coordinate system]. To rotate the datacube
by 90 degrees clockwise about the y axis when viewed from the +y direction;
the old z axis must become the new x axis, and the old x axis must become
the new z axis, while the new y axis remains old y axis. In this case the
axis that must be flipped prior to transposition is the x axis as shown
in example 2.
The parameter \fBlen_blk\fR controls how much memory is used during the
transpose operation. \fBlen_blk\fR elements are used in each axis at a
time, or a cube len_blk elements on a side. If \fBlen_blk\fR is too large,
the task will abort with an "out of memory" error. If it is too small,
the task can take a very long time to run. The maximum size of len_blk
depends on how much memory is available at the time IM3DTRAN is run,
and the size and datatype of the image to be transposed.
.ih
EXAMPLES
1. Transpose axes 1 2 and 3 of a list of input images to axes 2 1 and 3 of
a list of output images.
.nf
cl> im3dtran image1,image2,image3 tr1,tr2,tr3 2 1 3
.fi
2. For an input datacube with columns = x = abscissa, lines = y = ordinate,
and bands = z = depth increasing away from viewer, and with the image
origin at the lower left front, rotate datacube 90 degrees clockwise
around the y axis when viewed from +y (top):
.nf
cl> im3dtran input[-*,*,*] output 3 2 1
.fi
.ih
TIMINGS
.ih
BUGS
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SEE ALSO
imtranspose, imjoin, imstack, imslice
.endhelp
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