[mmthick] [Up] [mmwatershed] Thinning And Thickening

mmthin
Image transformation by thinning.

Synopsis

y = mmthin ( f , Iab = NullInterval, n = -1, theta = 45, DIRECTION = "CLOCKWISE" )

Input

f Image Binary image

Iab Interval

Default: NullInterval (Interval for homotopic thinning)
n Double Non-negative integer.

Number of iterations.

Default: -1 (Infinite (denoted by -1))
theta Double

Degrees of rotation: 45, 90, or 180.

Default: 45 (45)
DIRECTION String

Direction of rotation: 'CLOCKWISE' or ' ANTI-CLOCKWISE'

Default: "CLOCKWISE" ('CLOCKWISE')

Output

y Image Binary image

Description

mmthin creates the binary image y by performing a thinning of the binary image f. The number of iterations of the thinning is n and each iteration is performed by subtracting the points that are detect in f by hit-miss operators characterized by rotations of theta of the interval Iab. When n is infinite and the interval is mmhomothin (default conditions), mmthin gives the skeleton by thinning.

Examples

f=mmreadgray('scissors.tif')
f1=mmthin(f)
mmshow(f,f1) # skeleton
f2=mmthin(f1,mmendpoints(),15) # prunning 15 pixels
mmshow(f,f2) # prunned skeleton
f,f1 f,f2

Equation

See also

mmfreedom Control automatic data type conversion.
mmcthin Image transformation by conditional thinning.
mmthick Image transformation by thickening.
mmendpoints Interval to detect end-points.
mmhomothin Interval for homotopic thinning.
mmse2hmt Create a Hit-or-Miss Template (or interval) from a pair of structuring elements.
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