[mmcloseth] [Up] [mmopenrecth] Residues

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
    

See also

mmfreedom Control automatic data type conversion.
mmdil Dilate an image by a structuring element.
mmero Erode an image by a structuring element.
[mmcloseth] [Up] [mmopenrecth] Python