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| File Information |
| 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)
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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 |
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