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EXPAND_EDGE

Section: User Commands (1)
Updated: 16 Mar 1998
Index

 

NAME

expand_edge - Expand image by edge mirroring.

 

SYNTAX

expand_edge [-0] [-e] [-o] [-z <value>] [-p <size>]<inimage> <outimage>

 

DESCRIPTION

expand_edge is used on an image to aviod some typesof edge difficulties.

Expands inimageby sizepixels on all four edges,and writes the result to outimage.If the dimensionsof inimageis n x m, then the dimensions of outimagewill be (n + 2*size) x (m + 2*size).

Imagine placing mirrors on the edges of inimage.Thesemirror images are mapped to outimage. Using the defaultsetting, which is equivalent to specifying -e -p 3,the result will be like this:

       inimage                          outimage

ihg|ghi xyz|zyxfed|def . . . uvw|wvucba|abc rst|tsr+------- - - - -------+ ---+------- - - - -------+---abc rst| cba|abc rst|tsrdef . . . uvw| fed|def . . . uvw|wvughi xyz| ihg|ghi xyz|zyx
                     |         |                     |

 

OPTIONS

-0

The new pixels are set to 0 instead of being mirror images.

-z value

The new pixels are set to -valueinstead of being mirrorimages.

-e

Even expansion.

-o

Odd expansion. The pixels closest to the edge are not mirrored.

-p size

sizespecifies the width in pixels of the expanded edge.

 

RESTRICTIONS

inimagemust have pixel type unsigned byte.sizemust not exceed the smallest of the X dimensionand the Y dimension of inimage.If both -e and -o options are specified, -e (the default)is chosen.

 

SEE ALSO

expand_edge(3)

 

AUTHOR

Řivind Due Trier, BLAB, Ifi, UiO

 

EXAMPLES

expand_edge mona.img mona_expand.imgexpand_edge -0 -o -p 2 mona.img mona_zeroexpand.imgexpand_edge -z -255 -p 1 5.binary.img 5.binary_expand.img

 

ID

$Id: expand_edge.c,v 1.19 1997/01/14 15:47:01 svein Exp $

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Index

NAME

SYNTAX

DESCRIPTION

OPTIONS

RESTRICTIONS

SEE ALSO

AUTHOR

EXAMPLES

ID

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