[mmneg] [Up] [mmaddm] Operations

mmtoggle
Image contrast enhancement or classification by the toggle operator.

Synopsis

function y = mmtoggle ( f , f1 , f2 , OPTION )

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

Default: 'GRAY'

Values: 'BINARY' or '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]);

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

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

mmtoggle(f,f1,f2)

ans =
    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

Algorithm

function g = mmtoggle_equ(f,f1,f2,option)
  g=mmbinary(mmsubm(f,f1),mmsubm(f2,f));
  if (strcmp(option,'gray'))
    t=mmgray(g);
    g=mmunion(mmintersec(mmneg(t),f1),mmintersec(t,f2));
  end

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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Copyright (c) 1998-2008 by SDC Information Systems