Find indices of a binary matrix depicting a circular disk in the clockwise direction

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Trevor 2020-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/546951-find-indices-of-a-binary-matrix-depicting-a-circular-disk-in-the-clockwise-direction

评论： Trevor 2020-6-12

I have a binary matrix of a circular disk. I need to find the indices of all the ones in the matrix. However, I am trying to find it sequentially in the clockwise/anticlockwise direction. I have used the find fuction. But that gives me the indices in the row by row or column by column sequence rather than circumferentially. Any help will be appreciated

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Answer 1

Walter Roberson 2020-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/546951-find-indices-of-a-binary-matrix-depicting-a-circular-disk-in-the-clockwise-direction#answer_449972

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[rows, cols] = find(YourImage);
%find the centroid
rowcent = mean(rows);
colcent = mean(cols);
%convert to polar
[theta, rho] = cart2pol(cols - colcent, rows - rowcent);
%sort in polar
[~, sortidx] = sort(theta);
%reorder x y
sort_rows = rows(sortidx);
sort_cols = cols(sortidx);