Find continuous elements in matrix

2012 6 18
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Hi everyone,
my problem is the following: i've one matrix made of two possible values (i.e. 1 and 0). I also have the coordinates of one "starting point". I would like to select all the ones that are connected to this point without selecting the ones that are separeted by zeros. I can't figure out a way to solve the problem... can you help me?
Thanks in advance, Fabio

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Andrei Bobrov
Andrei Bobrov 2012-6-18

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use functions bwlabel and regionprops from Image Processing Toolbox
eg
youridx = {10,6}; % coordinates of one "starting point" (row - 10, column - 6)
a = [...
0 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0
0 0 1 0 0 0 0 0 0 1
0 1 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 1 0 0 1 0
0 0 1 0 1 0 0 1 0 0
0 1 0 0 0 0 0 0 1 0
0 0 1 0 0 0 0 1 0 0
0 0 0 0 1 1 1 0 0 0];
S = regionprops(a~=0,'PixelList');
t = bwlabel(a);
out = = fliplr(S(t(idx{:})).PixelList);

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Fabio
Fabio 2012-6-19
Thank you very much, this is working very well! I didn't mention in my introduction that the matrix i'm looking at is a 3d matrix (or it could be in future applications a n-dimension matrix, with n>3), but hopefully i'll find a way to extend this code to the 3rd dimension. If you have any other suggestion please tell me.
Sean de Wolski
Sean de Wolski 2012-6-19
should be extendable as is.

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