How to get pixel information which lies on boundary?

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Ekta Sharma on 22 Jan 2016

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Answered: Walter Roberson on 22 Jan 2016

I have detected boundary of an object in image but now i want to get the pixel information of a pixel which lies on that boundary in the very first row as from that point i want to apply chain code for the object.Can anyone provide me help on this?

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Answer 1

Walter Roberson on 22 Jan 2016

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https://in.mathworks.com/matlabcentral/answers/264749-how-to-get-pixel-information-which-lies-on-boundary#answer_207022

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[r, c] = find(BoundaryMask);
[first_row, row_idx] = min(r);
mask_cols_in_first_row = c(row_idx);

now first_row will be a scalar that is the index of "very first row" . mask_cols_in_first_row will be a vector of column indices of the pixels in the mask in that very first row.