image thumbnail

getborder

version 1.0.0.0 (1.55 KB) by Wolfgang Schwanghart
returns a logical border inside or outside a mask

1.8K Downloads

Updated 04 Jan 2008

View License

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

Cite As

Wolfgang Schwanghart (2021). getborder (https://www.mathworks.com/matlabcentral/fileexchange/12303-getborder), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R14
Compatible with any release
Platform Compatibility
Windows macOS Linux

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!