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mmgradm
Morphological gradient.

Synopsis

y = mmgradm( f, Bdil = None, Bero = None )

Implemented in Python.

Input

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

Bdil

Structuring Element

for the dilation.

Default: None (3x3 elementary cross)

Bero

Structuring Element

for the erosion.

Default: None (3x3 elementary cross)

Output

y	Image Gray-scale (uint8 or uint16) or binary image. (same type of `f`).

Description

mmgradm creates the image y by the subtraction of the erosion of the image f by Bero of the dilation of f by Bdil.

Examples

Binary image:

Binary image, internal and external gradient:

Gray-scale

>>> a = mmreadgray('small_bw.tif')

>>> b = mmgradm(a)

>>> mmshow(a)

>>> mmshow(b)


a	b

Binary image, internal and external gradient:

>>> c=mmgradm(a,mmsecross(0),mmsecross())

>>> d=mmgradm(a,mmsecross(),mmsecross(0))

>>> mmshow(a,c)

>>> mmshow(a,d)


a,c	a,d

Gray-scale

>>> a = mmreadgray('bloodcells.tif')

>>> b = mmgradm(a)

>>> mmshow(a)

>>> mmshow(b)


a	b

Equation

Source Code
        def mmgradm(f, Bdil=None, Bero=None):
    if Bdil is None: Bdil = mmsecross()
    if Bero is None: Bero = mmsecross()
    y = mmsubm(mmdil(f,Bdil),mmero(f,Bero))
    return y
    
      

mmfreedom	Control automatic data type conversion.
mmdil	Dilate an image by a structuring element.
mmero	Erode an image by a structuring element.

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

mmgradm Morphological gradient.