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getborder

by Wolfgang Schwanghart

18 Sep 2006 (Updated 04 Jan 2008)

Code covered by BSD License

returns a logical border inside or outside a mask

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Description

Ib = getborder(I,method)

getborder returns the outline around logical values in I (mask) using a 8-connected neighborhood.
I must be a logical n*m matrix. method 'inside' returns the inner border around "islands" of logical values. 'outside' returns the border outside the islands.

  Example:

  I = peaks(8)<0;

  Ib = getborder(I,'inside')

  Ib =

       0 0 1 1 1 1 1 1
       0 0 1 1 0 1 1 0
       1 0 0 1 1 1 0 0
       1 1 1 0 0 0 0 0
       1 1 1 0 0 0 0 0
       1 1 0 0 0 0 0 0
       0 0 0 0 0 0 0 0
       0 0 0 0 0 0 0 0

  Ib = getborder(I,'outside')

  Ib =

       0 1 0 0 0 0 0 0
       1 1 0 0 0 0 0 1
       0 1 1 0 0 0 1 1
       0 0 0 1 1 1 1 0
       0 0 0 1 0 0 0 0
       0 0 1 1 0 0 0 0
       1 1 1 0 0 0 0 0
       0 0 0 0 0 0 0 0

MATLAB release

MATLAB 7 (R14)

Tags for This File
Everyone's Tags	border logical mask, matrices
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Updates
27 Sep 2006	As getborder(A,'inner') did not return 1 when a cell is surrounded by zeros only, I changed this. Sorry...
03 Jan 2008	speed increased by employing conv2, better handle input
04 Jan 2008	removed padding since it was not neccessary

Tag Activity for this File
Tag	Applied By	Date/Time
matrices	Wolfgang Schwanghart	22 Oct 2008 08:39:45
border logical mask	Wolfgang Schwanghart	22 Oct 2008 08:39:45

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