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REMOVE_GHOST

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

NAME

remove_ghost, remove_inv_ghost, mark_ghost,mark_inv_ghost - remove (or mark) "ghost" objects from(or in) binary image

SYNTAX

int remove_ghost( IBAND segmented,
    IBAND original, IBAND outband,
    int val_step_threshold );
int remove_inv_ghost( IBAND segmented,
    IBAND original, IBAND outband,
    int val_step_threshold );
int mark_ghost( IBAND segmented,
    IBAND original, IBAND outband,
    int val_step_threshold );
int mark_inv_ghost( IBAND segmented,
    IBAND original, IBAND outband,
    int val_step_threshold );

DESCRIPTION

The original gray scale image originaland a binarizedversion segmentedare input to the routine.

.I remove_ghost

First, inbandis copied to outband.For all 4-connectedblack objects in outband,the average gradient magnitudevalue at the edge of the object is calculated. Objects havingan average gradient below the threshold valueval_step_thresholdare removed from outband.

.I remove_inv_ghost

Works like remove_ghoston 4-connected white objects.

.I mark_ghost

Works like remove_ghost, but instead of removing an object,it is colored (255 - avg_grad),where avg_gradis theaverage gradient value on the edge of the object. It can thenbe thresholded manually to give the final binary image.

.I mark_inv_ghost

Combination of mark_ghostand remove_inv_ghost.Works likeremove_inv_ghost, but instead of removing an object, it iscolored avg_grad,where avg_gradis the average gradientvalue on the edge of the object.

RESTRICTIONS

Works on unsigned byte bands.

RETURN VALUE

0 : ok
1 : Bad pixel type for segmented
2 : Bad pixel type for original
3 : Bad pixel type for outband

REFERENCES

.I S.D. Yanowitz & A.M. Bruckstein

"A New Method for Image Segmentation",Comput. Vision Graphics Image Proc., vol 46, no 1, pp 82-95,April 1989.

FILES

src/binarize/remove_ghost.c

AUTHOR

Řivind Due Trier

ID

$Id: remove_ghost.c,v 1.18 1997/01/29 10:37:42 svein Exp $

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