How can i find 4 continuous component in row and replace

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Triveni
Triveni 2016-8-6
评论： Walter Roberson 2016-8-8
I have a row,
I = [60 60 0 0 0 0 45 60 90];
% I want to find 4 continuous component, and 4th component should be replaced with next component from 4th component. Means, 4th component is 0 which is found in column 6, then it should be replace with column 6th i.e 45,
%Just tell me how to find index, i.e I(6).
New_I = [60 60 0 0 0 45 0 60 90];
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Triveni
Triveni 2016-8-6
编辑：Walter Roberson 2016-8-8
I = [60 60 0 0 0 0 45 60 90]; % 9 columns in I and 4th 0 is in 6th column
% I want to replace column 6 or 4th (0) with 45 or column (7).
New_I = [60 60 0 0 0 45 0 60 90];
Because i need to all component group should be present in the row, but continuously no any component more than 4.
Image Analyst
Image Analyst 2016-8-6
Clear as mud. Too bad because I'm quitting for the day. See my comment above (again), my answer below, and look up regionprops() in the help, particularly the PixelIdxList property.

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回答（1 个）

Image Analyst
Image Analyst 2016-8-6
Which zero got replaced? It just looks like you inserted a 45 between the 3rd and 4th zero but there are still 4 zeros like in your original vector.
To find 4 zeros in a row, use bwpropfilt():
I = [60 60 0 0 0 0 45 60 90];
props = bwpropfilt(I == 0, 'Area', 4)
% Now props will = [0 0 1 1 1 1 0 0 0]
% Use that however you want - you're not clear.
% For example
I_new = I; % Initialize
% Replace those zeros with 45's
I_new(props) = 45
  2 个评论
Triveni
Triveni 2016-8-8
编辑：Walter Roberson 2016-8-8
Please just tell me how to find index of 4th zero i.e I(1,6,1).
Walter Roberson
Walter Roberson 2016-8-8
zidx = find(I==0, 4, 'first');
if length(zidx) < 4
error('I does not have at least 4 zeros');
end
pos_of_4th_zero = zidx(4);

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