vabsdiff(1)

PROGRAM
vabsdiff - Compute the absolute difference between two images pixel by pixel.

SYNTAX

vabsdiff

-i1 first input image

-i2 second input image

-o  resulting output image

[-m]
    operation masking image

[-V]
    Gives the version for vabsdiff

[-U]
    Gives the usage for vabsdiff

[-P]
    Prompts for command line options

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

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

DESCRIPTION
vabsdiff computes the absolute difference between two input images of the same size and same number of data bands.

The mask image is used to gate the operation. A non-zero mask pixel enables the output pixel to contain the absolute difference. A zero mask pixel just transfers the value of the corresponding pixel in the first input image to the output pixel.

The two input images must be of the same size and have the same number of data bands, as must the optional mask image. The input images may be of the same or different data types. If the input images are of different data types, then all input images will be upcast to the highest input image data type. The output image data type will be the same as that of the highest data type of the input images.

REQUIRED ARGUMENTS

-i1 type: infile
    desc: first input image

-i2 type: infile
    desc: second input image

-o  type: outfile
    desc: resulting output image

OPTIONAL ARGUMENTS

-m  type: infile
    desc: operation masking image

EXAMPLES
vabsdiff -i1 input.image1 -i2 input.image2 -o output.image -m mask.image

This finds the absolute difference pixel by pixel between input.image1 and input.image2 using a mask. The result is stored in output.image.

SEE ALSO
intro(1), verror(3), vgparms(3), vutils(3), lvabsdiff(3) vcast(1)

RESTRICTIONS
vabsdiff will not operate on:
    Transform
    Complex
    or Bit
data storage types.

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