Find continuous elements in matrix

Question

Fabio 2012-6-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41416-find-continuous-elements-in-matrix

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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Walter Roberson 2012-6-18

Do you have the Image Processing Toolbox?

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Answer 1

Andrei Bobrov 2012-6-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/41416-find-continuous-elements-in-matrix#answer_51060

在 MATLAB Online 中打开

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 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.