[mmcloserec] [Up] [mmvmax] Connected Operators

mmhmin
Remove basins with contrast less than h.

Synopsis

y = mmhmin( f, h = 1, Bc = None )

Implemented in Python.

Input

f Image Gray-scale (uint8 or uint16) image.

Double

Contrast parameter.

Default: 1

Structuring Element

Structuring element (connectivity).

Default: None (3x3 elementary cross)

Output

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

Description

mmhmin sup-reconstructs the gray-scale image f from the marker created by the addition of the positive integer value h to f, using the connectivity Bc. This operator removes connected basins with contrast less than h. This function is very userful for simplifying the basins of the image.

Examples

Numerical example:

>>> a = uint8([
    [10,   3,   6,  18,  16,  15,  10],
    [10,   9,   6,  18,   6,   5,  10],
    [10,   9,   9,  15,   4,   9,  10],
    [10,  10,  10,  10,  10,  10,  10]])

>>> print mmhmin(a,1,mmsebox())

[[10  4  6 18 16 15 10]
 [10  9  6 18  6  5 10]
 [10  9  9 15  5  9 10]
 [10 10 10 10 10 10 10]]

Signal example:

Image example:

>>> f = mmreadgray('r4x2_256.tif')

>>> mmshow(f)

>>> fb = mmhmin(f,70)

>>> mmshow(fb)

>>> mmshow(mmregmin(fb))


f	fb


mmregmin(fb)

Equation

Source Code
        def mmhmin(f, h=1, Bc=None):
    if Bc is None: Bc = mmsecross()
    g = mmaddm(f,h)
    y = mmsuprec(g,f,Bc);
    return y
    
      

mmsebox	Create a box structuring element.
mmsecross	Diamond structuring element and elementary 3x3 cross.
mmfreedom	Control automatic data type conversion.
mmhmax	Remove peaks with contrast less than h.
mmareaclose	Area closing

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

mmhmin Remove basins with contrast less than h.