Extract segments of 1's from binary matrix

2022 7 5
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Hi,
I'm looking for a way to extract segments of 1's in a arbirtay big binary matrix. For example, in this matrix:
0 0 0 0 0 0 0 0
1 1 1 1 1 0 0 1
0 0 0 1 0 0 0 1
0 0 0 1 0 0 0 1
I would like to extract 3 segments automatically, for example like:
(2, 1:5)
(2:4, 8)
(3:4, 4) or alternativy (2:4,4)
I'm not bound to the above notation regarding start and stop, it can be stored in any way, it is just an example.
I have played around with find() but I don't seem to be able to get it right
/Niklas

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Walter Roberson
Walter Roberson 2022-7-5

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You can bwconncomp and pass in a connection array that is a central row or central column of 1s. You would do that twice, once for each direction, and ignore the components of size 1.

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Niklas Persson
Niklas Persson 2022-7-5
Thank you!
The function looks promising, however, I'm not sure what you mean by:
pass in a connection array that is a central row or central column of 1s. You would do that twice, once for each direction, and ignore the components of size 1.
I have given the function a go with a 4 connectivty input, but it sounds very intresting if it is possible to do it for one dimension at the time, but I don't see that in the documentation for the function?
/Niklas
Niklas Persson
Niklas Persson 2022-7-5
Ah, I found it!
I should read the documentation more carefully
Thanks a lot!
Walter Roberson
Walter Roberson 2022-7-5
To expand a little, bwconncomp accepts connectivity that is a number, but it also accepts connectivity as a mask array such as [0 0 0;1 1 1;0 0 0]

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