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BIN_WR1

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

NAME

bin_wr1 - binarize a gray-scale band using White andRohrers first method.

SYNTAX

int bin_wr1( IBAND inband, IBAND outband,
    int x_lookahead, int y_lookahead,
    int bias_mode, int bias_factor,
    int f_factor, int g_factor,
    int intermediate_images );

DESCRIPTION

The input band inbandis binarized using White and Rohrer`sfirst method. The x_lookaheadand y_lookaheadparametersgives the number of lookahead pixels used in the biasedrunning average that is used in deciding the threshold ateach pixel location. Good values for x_lookaheadandy_lookaheadare 8 and 1, respectively.

RESTRICTIONS

inbandand outbandmust have pixel type unsigned byte.

REFERENCES

.I James M. White & Gene D. Rohrer

"Image Thresholding for Optical Character Recognition andOther Applications Requiring Character Image Extraction",IBM Journal of Research and Development,vol 27, no 4, pp 400-411, July 1983.

RETURN VALUE

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

FILES

src/binarize/bin_wr1.c

AUTHOR

Řivind Due Trier

ID

$Id: bin_wr1.c,v 1.11 1997/01/14 15:46:58 svein Exp $

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