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mmswatershed
Detection of similarity-based watershed from markers.

Synopsis

y = mmswatershed( f, g, B = None, LINEREG = "LINES" )

Implemented in Python.

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: `None` (3x3 elementary cross)
LINEREG	String 'LINES' or ' REGIONS'. Default: `"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 LotuFalc:00.

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]]

Source Code
        def mmswatershed(f, g, B=None, LINEREG="LINES"):
    if B is None: B = mmsecross()
    print 'Not implemented yet'
    return None
    return y
    
      

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.

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Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center.

mmswatershed Detection of similarity-based watershed from markers.