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mmasf
Alternating Sequential Filtering

Synopsis

function y = mmasf ( f , SEQ , b , n )

Input

f Image Gray-scale (uint8 or uint16) or binary image
SEQ String

Default: 'OC'

'OC', 'CO', 'OCO', 'COC'.
b Structuring Element

Default: 3x3 elementary cross
n Double Non-negative integer.

Default: 1

(number of iterations).

Output

y 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:

Algorithm

function y=mmasf_equ( f, SEQ, b, n )
switch SEQ
case 'OC',
   y = f;
   for i=1:n
      nb = mmsesum(b,i);
      y = mmclose(y,nb);
      y = mmopen(y,nb);
   end;
case 'CO',
   y = f;
   for i=1:n
      nb = mmsesum(b,i);
      y = mmopen(y,nb);
      y = mmclose(y,nb);
   end;
case 'OCO',
   y = f;
   for i=1:n
      nb = mmsesum(b,i);
      y = mmopen(y,nb);
      y = mmclose(y,nb);
      y = mmopen(y,nb);
   end;   
case 'COC',
   y = f;
   for i=1:n
      nb = mmsesum(b,i);
      y = mmclose(y,nb);
      y = mmopen(y,nb);
      y = mmclose(y,nb);
   end;
end;

See also

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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