vtilt(1)

PROGRAM
vtilt - Adds a specified plane to the input image to correct for a tilt in the image luminance.

SYNTAX

vtilt

-i  input image

-o  resulting output image

[-m]
    tilt operation masking image

[-x]
    specifies the slope in the X direction

[-y]
    specifies the slope in the Y direction

[-V]
    Gives the version for vtilt

[-U]
    Gives the usage for vtilt

[-P]
    Prompts for command line options

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

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

DESCRIPTION
vtilt adds tilt to an image. Often an image will have a skew in the grey level values that represents a plane with a certain slope. The tilt takes the form of a plane which has an x and y zero crossing at the center of the image with x an y slope as specified in the argument list. The x and y slopes must be given in units per pixel and the x and y values default to 0.0.

The optional mask image (-m) 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 output image

OPTIONAL ARGUMENTS

-m  type: infile
    desc: tilt operation masking image

-x  type: float
    desc: specifies the slope in the X direction
    default: 0
    bounds: no range checking

-y  type: float
    desc: specifies the slope in the Y direction
    default: 0
    bounds: no range checking

EXAMPLES
vtilt -i image -o out -x 2 -y -1

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

RESTRICTIONS
vtilt will not operate on COMPLEX or BIT data storage types.

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