vdetilt(1)

PROGRAM
vdetilt - Remove an illumination gradient from an image by subtracting a best-fit plane.

SYNTAX

vdetilt

-i  input image

-o  resulting detilted image

[-m]
    find tilt operation masking image

[-p]
    if yes, remove mean from image

[-V]
    Gives the version for vdetilt

[-U]
    Gives the usage for vdetilt

[-P]
    Prompts for command line options

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

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

DESCRIPTION
vdetilt computes the best-fit plane for an image, and then subtracts that plane from the image to produce the output. This is very handy for correcting illumination gradients in a poorly digitized image. The -p option also removes the mean from the image, giving it zero-mean statistics. If p is set to yes (default), then remove mean from image.

The optional mask image must be of the same data type as the input images, and is used to gate the operation. A non-zero mask pixel enables the output pixel to contain the adjusted value. A zero mask pixel just transfers the value of the corresponding pixel in the first input image to the output pixel.

REQUIRED ARGUMENTS

-i  type: infile
    desc: input image

-o  type: outfile
    desc: resulting detilted image

OPTIONAL ARGUMENTS

-m  type: infile
    desc: find tilt operation masking image

-p  type: boolean
    desc: if yes, remove mean from image
    default: true

EXAMPLES

SEE ALSO
intro(1), verror(3), vgparms(3), vutils(3), lvdetilt(3) vgettilt(1), lvgettilt(3), vtilt(1), lvtilt(3)

RESTRICTIONS
vdetilt will not work on BIT, transform or COMPLEX data storage types.

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