[mmneg] [Up] [mmaddm] Operations

mmtoggle
Image contrast enhancement or classification by the toggle operator.

Synopsis

y = mmtoggle( f, f1, f2, OPTION = "GRAY" )

Implemented in Python.

Input

f	Image Gray-scale (uint8 or uint16) image.
f1	Image Gray-scale (uint8 or uint16) image.
f2	Image Gray-scale (uint8 or uint16) image.
OPTION	String Values: 'BINARY' or 'GRAY'. Default: `"GRAY"`

Output

y	Image binary image if option is 'BINARY' or same type as `f`

Description

mmtoggle creates the image y that is an enhancement or classification of the image f by the toggle operator, with parameters f1 and f2. If the OPTION is 'GRAY', it performs an enhancement and, if the OPTION is 'BINARY', it performs a binary classification. In the enhancement, a pixel takes the value of the corresponding pixel in f1 or f2, according to a minimum distance criterion from f to f1 or f to f2. In the classification, the pixels in f nearest to f1 receive the value 0 , while the ones nearest to f2 receive the value 1.

Examples

Gray-scale option:

>>> f = uint8([0,1,2,3,4,5,6])

>>> print f

[0 1 2 3 4 5 6]

>>> f1 = uint8([0,0,0,0,0,0,0])

>>> print f1

[0 0 0 0 0 0 0]

>>> f2 = uint8([6,6,6,6,6,6,6])

>>> print f2

[6 6 6 6 6 6 6]

>>> print mmtoggle(f,f1,f2)

[0 0 0 6 6 6 6]

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

>>> b = mmero(a,mmsedisk(2))

>>> c = mmdil(a,mmsedisk(2))

>>> d = mmtoggle(a,b,c)

>>> mmshow(a)

>>> mmshow(d)


a	d

Binary option:

>>> e = mmreadgray('lenina.tif')

>>> f = mmero(e,mmsedisk(2))

>>> g = mmdil(e,mmsedisk(2))

>>> h = mmtoggle(e,f,g,'BINARY')

>>> mmshow(e)

>>> mmshow(h)


e	h

Equation

Gray-scale option

Binary option

Limitations

f1 must be less or equal f and f must be less or equal f2.

Source Code
        def mmtoggle(f, f1, f2, OPTION="GRAY"):
    from string import upper
    y=mmbinary(mmsubm(f,f1),mmsubm(f2,f))
    if upper(OPTION) == 'GRAY':
        t=mmgray(y)
        y=mmunion(mmintersec(mmneg(t),f1),mmintersec(t,f2))
    return y
    
      

mmfreedom	Control automatic data type conversion.
mmthreshad	Threshold (adaptive)

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

mmtoggle Image contrast enhancement or classification by the toggle operator.