vhpf(1)

PROGRAM
vhpf - Perform a high-pass filtering operation on an image in the frequency domain.

SYNTAX

vhpf

-i  first input image

-o  resulting output image

-n  selects the order of the filter

-c  selects the cut off radius

[-t]
    Choose Exponential Filter [False] or Butterworth Filter [True]

[-V]
    Gives the version for vhpf

[-U]
    Gives the usage for vhpf

[-P]
    Prompts for command line options

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

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

DESCRIPTION
vhpf performs a high-pass filtering operation on an image in the frequency domain. The filter cutoff is a radius normalized to the longest image dimension (lets you filter non-square images, but with an elliptical cutoff area). The order of the filter is an integer specifying the sharpness of the cutoff.

REQUIRED ARGUMENTS

-i  type: infile
    desc: first input image

-o  type: outfile
    desc: resulting output image

-n  type: integer
    desc: selects the order of the filter

-c  type: float
    desc: selects the cut off radius

OPTIONAL ARGUMENTS

-t  type: boolean
    desc: Choose Exponential Filter [False] or Butterworth Filter [True]
    default: false

EXAMPLES
vhpf -i input.image -o output.image -n 1 -c 1 -t 0

This command high-pass filters input.image and stores the result in output.image. The order of the filter is 1 and the cutoff radius is 1. An exponential filter is used.

SEE ALSO
intro(1), verror(3), vgparms(3), vutils(3), lvhpf(3)

RESTRICTIONS
vhpf will complain if asked to operate on non COMPLEX input images.

Filters of high order can take a long time to do their work.

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