[mmskelmrec] [Up] [mmhomothick] Intervals (hit-or-miss templates)

mmendpoints
Interval to detect end-points.

Synopsis

function Iab = mmendpoints ( OPTION )

Input

OPTION String

Default: 'LOOP'

'LOOP' or 'HOMOTOPIC'

Output

Iab Interval

Description

mmendpoints creates an interval that is useful to detect end-points of curves (i.e., one pixel thick connected components) in binary images. It can be used to prune skeletons and to mark objects transforming them in a single pixel or closed loops if they have holes. There are two options available: LOOP, deletes all points but preserves loops if used in mmthin ; HOMOTOPIC, deletes all points but preserves the last single point or loops.

Examples

Interval visualization
mmintershow(mmendpoints)

ans =
. . . 
0 1 0 
0 0 0

mmintershow(mmendpoints('HOMOTOPIC'))

ans =
. 1 . 
0 1 0 
0 0 0
Pruning
f = mmreadgray('pcbholes.tif');

mmshow(f);

f1 = mmthin(f);

mmshow(f1);

f2 = mmthin(f1,mmendpoints,20);

mmshow(f2);
f f1
f2
Homotopic marking
fn = mmthin(f1,mmendpoints('HOMOTOPIC'));

mmshow(mmdil(fn));
mmdil(fn)

Equation

See also

mmfreedom Control automatic data type conversion.
mmhomothick Interval for homotopic thickening.
mmhomothin Interval for homotopic thinning.
mmsupcanon Union of sup-generating or hit-miss operators.
mmsupgen Sup-generating (hit-miss).
mmthin Image transformation by thinning.
mmse2hmt Create a Hit-or-Miss Template (or interval) from a pair of structuring elements.
mmintershow Visualize an interval.
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