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EXPAND_EDGE

Section: C Library Functions (3)
Updated: 16 Mar 1998
Index

NAME

expand_edge - Expand image by edge mirroring.

SYNTAX

#include <xite/binarize.h>

int expand_edge( IBAND inband, int zero_expand,
int even_expand, int expand_depth,
IBAND outband );

DESCRIPTION

expand_edgeis used on a band to avoid some typesof edge difficulties.

Expands inbandby expand_depthpixels on all four edges,and writes the result to outband.If the dimensionsof inbandare n x m, then the dimensions of outbandwill be (n + 2*size) x (m + 2*size).

Imagine placing mirrors on the edges of inband.Thesemirror bands are mapped to outband.Using expand_depth= 3 and even_expand== 1, the result will be like this:

inband: outband:

                            ihg|ghi               xyz|zyx
                            fed|def     . . .     uvw|wvu
                            cba|abc               rst|tsr
+------- - - - -------+    ---+------- - - - -------+---
|abc               rst|    cba|abc               rst|tsr
|def     . . .     uvw|    fed|def     . . .     uvw|wvu
|ghi               xyz|    ihg|ghi               xyz|zyx
|                     |       |                     |
.                     .       .                     .
.                     .       .                     .
.                     .       .                     .

If zero_expand== 1, the new pixels are set to 0 instead.Else, if zero_expand<= -1, then the new pixels are set to-zero_expand.To expand a binary image with a whiteborder, use zero_expand= -255.If even_expand== 0, the pixels closest to the edge arenot mirrored/repeated.`expand_depthspecifies the width in pixels of thesections of inbandto be mirrored.

RESTRICTIONS

inbandand outbandmust have pixel type unsigned byte.`expand_depthmust not exceed the smallest of the X dimensionand the Y dimension of inband.

RETURN VALUE

0  => ok
1  => Bad pixel type
2  => parameter 'expand_depth' too large.
3  => outband too small.

FILES

src/binarize/expand_edge.c

AUTHOR

Řivind Due Trier, BLAB, Ifi, UiO.

ID

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

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