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Section: Misc. Reference Manual Pages (16 Mar 1998)
Index

NAME

bin_be - binarize a gray-scale band usingBernsen`s method

SYNTAX

#include <xite/binarize.h>
int bin_be( int region_size,
int contrast_limit, int set_doubt_to_low,
IBAND inband, IBAND outband );

DESCRIPTION

The input band inbandis binarized usingthe method of Bernsen, the result returnedin outband.

For each pixel, the threshold

T(x,y) = (Z_low + Z_high)/2

is used, where Z_low and Z_high are the lowest and highestgray level pixel values in a square neighborhood of size(region_sizex region_size)about the pixel (x,y).However, if the contrast measure

C(x,y) = Z_high - Z_low < contrast_limit

the pixel is set to 255 if set_doubt_to_low== 0, and to 0if set_doubt_to_low>= 1.

FILES

src/binarize/bin_be.c

REFERENCES

.I John Bernsen

"Dynamic thresholding of grey-level images",Proc. 8th International Conference on PatternRecognition (ICPR8), pp 1251-1255, Paris, France,October 1986.

RETURN VALUE

0 : ok
1 : Bad input pixel type
2 : Bad output pixel type

RESTRICTIONS

inbandand outbandmust have pixel type unsigned byte.

AUTHOR

Oivind Due Trier

EXAMPLES

ID

$Id: bin_be.c,v 1.15 1997/01/14 15:46:50 svein Exp $

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