How to compute regions of matrix

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Sepp
Sepp 2014-5-13
回答： Jos (10584) 2014-5-13
Hi all
Let's say we have the following matrix:
0 0 0 0 0 0
0 1 0 0 0 0
1 1 0 0 0 0
1 1 0 0 0 0
0 0 0 0 0 0
0 0 0 1 1 1
0 0 0 0 1 1
0 0 0 0 0 0
I want to calculate the size of every connected region of 1s and also get the corresponding matrix elements of each region. The size should be computed as (width + heigth) / 2.
In the example the bottom left region would have size (2 + 3) / 2 and the bottom right region would have size (3 + 2) / 2.
Additional to the size of the regions I also want the corresponding entries of the regions, i.e. region 1 has entries (2,2), (3,1), (3,2) and so on.
How can this be done in Matlab?
I'm looking forward for the answers and wish everybody all the best.

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采纳的回答

Jos (10584)
Jos (10584) 2014-5-13
Trivial, provided you have the image processing toolbox. Take a look at BWLABEL and REGIONPROPS
M = [ 0 0 0 0 0 0
0 1 0 0 0 0
1 1 0 0 0 0
1 1 0 0 0 0
0 0 0 0 0 0
0 0 0 1 1 1
0 0 0 0 1 1
0 0 0 0 0 0]
P = regionprops(bwlabel(M),'boundingbox')
The last two values of the field BoudingBox will give you the height and the width of each connected region.

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