How to filter out annular data from square matrix
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Have a square matrix...501 by 501...Z=501×501
Need to filter out an annular data 20 to 150 centered at (251,251)
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Image Analyst
le 7 Juil 2018
See the FAQ for creating a circle:
Then to get row and column indexes for your matrix, simply round, making sure that x is the second dimension, not the first because arrays are indexes as array(y, x) NOT array(x,y)
rows = round(y);
columns = round(x);
for k = 1 : length(rows)
Z(rows(k), columns(k)) = 0; % Filter to have whatever value you want them to have.
end
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Image Analyst
le 8 Juil 2018
Looks fine to me
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/190096/image.png)
Probably a rendering issue. Look at the opengl() function and try some different things.
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