[mmareaopen] [Up] [mmcloserec] Connected Operators

mmasfrec
Reconstructive Alternating Sequential Filtering

Synopsis

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

Implemented in Python.

Input

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

Output

y	Image Same type of `f`

Description

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

Examples

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

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

>>> mmshow(f)

>>> mmshow(g)


f	g

Equation

Case oc, reconstructive close-open filter:

Case co, reconstructive open-close filter:

Source Code
        def mmasfrec(f, SEQ="OC", b=None, bc=None, n=1):
    from string import upper
    if b is None: b = mmsecross()
    if bc is None: bc = mmsecross()
    SEQ = upper(SEQ)
    y = f
    if SEQ == 'OC':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmcloserec(y,nb,bc)
            y = mmopenrec(y,nb,bc)
    elif SEQ == 'CO':
        for i in range(1,n+1):
            nb = mmsesum(b,i)
            y = mmopenrec(y,nb,bc)
            y = mmcloserec(y,nb,bc)
    else:
        assert 0,'Only accepts OC or CO for SEQ parameter'
    return y
    
      

mmasf	Alternating Sequential Filtering
mmsebox	Create a box structuring element.
mmsecross	Diamond structuring element and elementary 3x3 cross.
mmopenrec	Opening by reconstruction.
mmcloserec	Closing by reconstruction.
mmfreedom	Control automatic data type conversion.

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

mmasfrec Reconstructive Alternating Sequential Filtering