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mmasf
Alternating Sequential Filtering

Synopsis

y = mmasf( f, SEQ = "OC", b = None, n = 1 )

Implemented in Python.

Input

f	Image Gray-scale (uint8 or uint16) or binary image.
SEQ	String 'OC', 'CO', 'OCO', 'COC'. Default: `"OC"`
b	Structuring Element Default: `None` (3x3 elementary cross)
n	Double Non-negative integer. (number of iterations). Default: `1`

Output

Image

Description

mmasf creates the image y by filtering the image f by n iterations of the close and open alternating sequential filter characterized by the structuring element b. The sequence of opening and closing is controlled by the parameter SEQ. 'OC' performs opening after closing, 'CO' performs closing after opening, 'OCO' performs opening after closing after opening, and 'COC' performs closing after opening after closing.

Examples

Binary image:

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

>>> g=mmasf(f,'oc',mmsecross(),2)

>>> mmshow(f)

>>> mmshow(g)


f	g

Gray-scale image:

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

>>> g=mmasf(f,'oc',mmsecross(),3)

>>> mmshow(f)

>>> mmshow(g)


f	g

Equation

Case oc, close-open filter:

Case co, open-close filter:

Case oco:

Case coc:

Source Code
        def mmasf(f, SEQ="OC", b=None, n=1):
    from string import upper
    if b is None: b = mmsecross()
    SEQ=upper(SEQ)
    y = f
    if SEQ == 'OC':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmopen(mmclose(y,nb),nb)
    elif SEQ == 'CO':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmclose(mmopen(y,nb),nb)
    elif SEQ == 'OCO':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmopen(mmclose(mmopen(y,nb),nb),nb)
    elif SEQ == 'COC':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmclose(mmopen(mmclose(y,nb),nb),nb)
    return y
    
      

mmfreedom	Control automatic data type conversion.
mmsebox	Create a box structuring element.
mmsecross	Diamond structuring element and elementary 3x3 cross.
mmopen	Morphological opening.
mmclose	Morphological closing.
mmasfrec	Reconstructive Alternating Sequential Filtering

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

mmasf Alternating Sequential Filtering