finding interior region

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Hi I have the following code and have some output as follows:

I =

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

K>> boundary = bwboundaries(I,8,'noholes'); K>> boundary

boundary =

    [19x2 double]
    [ 7x2 double]

here is two boundary, I need to know how to determine which boundary is interior, Here [ 7x2 double] is in interior region of [19x2 double]. How to determine that easily?

Can anybody help?

Thanks

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Answer 1

Andrei Bobrov 2011-6-21

在 MATLAB Online 中打开

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>> [B,L] = bwboundaries(I,8,'noholes')
B = 
    [19x2 double]
    [ 7x2 double]
L =
     0     1     1     1     1     1     0
     1     0     0     0     0     0     1
     1     0     2     2     2     0     1
     1     0     2     2     2     0     1
     1     0     0     0     0     0     1
     0     1     1     1     1     1     0
>>

B{1} -> label 1 (L == 1)

B{2} -> label 2 (L == 2)

EDIT 2

>> [B,L,N,A] = bwboundaries(I,8,'noholes')
B = 
    [19x2 double]
    [ 7x2 double]
L =
     0     1     1     1     1     1     0
     1     0     0     0     0     0     1
     1     0     2     2     2     0     1
     1     0     2     2     2     0     1
     1     0     0     0     0     0     1
     0     1     1     1     1     1     0
N =
     2
A =
   (2,1)        1
>> full(A)
ans =
     0     0
     1     0