
vgrow(1)                     Khoros                      vgrow(1)

PROGRAM
     vgrow - Computes the median axis inverse transform.

SYNTAX
     vgrow

     -i             input image

     -o             output image

     [-V]           Gives the version for vgrow

     [-U]           Gives the usage for vgrow

     [-P]           Prompts for command line options

     [-A [file1]]   Creates the answer file called vgrow.ans or
                    file1

     [-a [file1]]   Uses vgrow.ans or file1 as the answer file

DESCRIPTION
     vgrow computes the median axis inverse transform.

     This transformation allows the recovery of the original
     image from a median axis image.
     This routine is useful for displaying the modifications
     introduced after any transformation of the median axis.

     This transformation assigns the value 255 to any pixel whose
     distance to at least one median axis pixel, is less than or
     equal to the value of this pixel.
     The user is refered to the man pages of the median axis rou-
     tine as an aid in understanding the inverse transform.

     ADVICE:

          For this routine, the image must be a byte image, with
          the gray level value of 0 for the background. The pix-
          els that do not belong to the background are supposed
          to belong to a median axis, so it is advisable to use
          an image obtained from the median axis transform.

REQUIRED ARGUMENTS
     -i     type: infile
            desc: input image

     -o     type: outfile
            desc: output image

OPTIONAL ARGUMENTS
     none

EXAMPLES
     vgrow -i image1  -o image2
     Computes the median axis transform.
     For this routine, the image must be a median axis represen-
     tation of an image (obtained from vmediaxis).

SEE ALSO
     intro(1), verror(3), vgparms(3), vutils(3), lvgrow(3)
     lvgrow(3), lvdistance(3), vdistance(1), lvmediaxis(3),
     vmediaxis(1)

RESTRICTIONS
     vgrow works only on BYTE images that represent a coherent
     median axis of an image.

COPYRIGHT
     Copyright 1991, University of New Mexico.  All rights
     reserved.

Khoros                    Release: 1.0                          1

