[mmneg] [Up] [mmaddm] Operations

mmtoggle
Image contrast enhancement or classification by the toggle operator.

Synopsis

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

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" ('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.

See also

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