[mmsuprec] [Up] [mmareaopen] Connected Operators

mmareaclose
Area closing

Synopsis

y = mmareaclose ( f , a , Bc = NullStrel )

Input

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

a Double

non negative integer.
Bc Structuring Element

( connectivity).

Default: NullStrel (3x3 elementary cross)

Output

y Image

Same type of f

Description

mmareaclose removes any pore (i.e., background connected component) with area less than a of a binary image f. The connectivity is given by the structuring element Bc. This operator is generalized to gray-scale images by applying the binary operator successively on slices of f taken from higher threshold levels to lower threshold levels.

Examples

Binary image:
a=mmreadgray('form-1.tif')
b=mmareaclose(a,400)
mmshow(a)
mmshow(b)
a b
Gray-scale image:
a=mmreadgray('n2538.tif')
b=mmareaclose(a,400)
mmshow(a)
mmshow(b)
a b

Equation

Limitations

The structuring elements allowed are the elementary cross (4-connected) and the elementary box (8-connected).

See also

mmareaopen Area opening
mmlabel Label a binary image.
mmsebox Create a box structuring element.
mmsecross Diamond structuring element and elementary 3x3 cross.
mmfreedom Control automatic data type conversion.
mmclohole Close holes of binary and gray-scale images.
mmregmin Regional Minimum (with generalized dynamics).
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