[mmskiz] [Up] [mmthick] Thinning And Thickening

mmswatershed
Detection of similarity-based watershed from markers.

Synopsis

y = mmswatershed ( f , g , B = NullStrel, LINEREG = "LINES" )

Input

f Image Gray-scale (uint8 or uint16) image

g Image Gray-scale (uint8 or uint16) or binary image

Marker image. If binary, each connected component is an object marker. If gray, it is assumed it is a labeled image.
B Structuring Element

(watershed connectivity)

Default: NullStrel (3x3 elementary cross)
LINEREG String

Output image: 'LINES' or 'REGIONS'.

Default: "LINES" ('LINES')

Output

y Image Gray-scale (uint8 or uint16) or binary image

Description

mmswatershed creates the image y by detecting the domain of the catchment basins of f indicated by g, according with the connectivity defined by B. This watershed is a modified version where each basin is defined by a similarity criterion between pixels. The original watershed is normally applied to the gradient of the image. In this case, the gradient is taken internally. According to the flag LINEREG y will be a labeled image of the catchment basins domain or just a binary image that presents the watershed lines. The implementation of this function is based on [LF00].

Examples

Numerical
f = uint8([
    [0,  0,  0,  0,  0,  0,  0],
    [0,  1,  0,  0,  0,  1,  0],
    [0,  1,  0,  0,  0,  1,  0],
    [0,  1,  1,  1,  1,  1,  0],
    [0,  1,  0,  0,  0,  0,  0],
    [0,  0,  0,  0,  0,  0,  0]])
m = uint8([
    [0,  0,  0,  0,  0,  0,  0],
    [0,  1,  0,  0,  0,  0,  0],
    [0,  0,  0,  0,  0,  0,  0],
    [0,  0,  0,  0,  0,  0,  0],
    [0,  0,  0,  0,  0,  0,  0],
    [0,  0,  0,  2,  0,  0,  0]])
print mmswatershed(f,m,mmsecross(),'REGIONS')
[[2 2 2 2 2 2 2]
 [2 1 2 2 2 1 2]
 [2 1 2 2 2 1 2]
 [2 1 1 1 1 1 2]
 [2 1 2 2 2 2 2]
 [2 2 2 2 2 2 2]]

See also

mmcwatershed Detection of watershed from markers.
mmwatershed Watershed detection.
mmfreedom Control automatic data type conversion.
mmsebox Create a box structuring element.
mmsecross Diamond structuring element and elementary 3x3 cross.
[mmskiz] [Up] [mmthick]
Copyright (c) 1998-2008 by SDC Information Systems