counting holes in an image
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Pamela Huntley
il 26 Mar 2020
Risposto: Image Analyst
il 27 Mar 2020
writing an algorithm that will count the number of holes in the image that do not touch the border
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Image Analyst
il 27 Mar 2020
Threshold then call imclearborder() and bwlabel(). Assuming you have dark holes on a bright background:
% Binarize:
binaryImage = grayImage < someValue;
% Remove those touching border
binaryImage = imclearborder(binaryImage);
% Count holes:
[~, numHoles] = bwlabel(binaryImage);
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Walter Roberson
il 26 Mar 2020
Invert the image so the holes become solid and the solid gets removed. Remove from that all solid touching the border -- those correspond to holes that were touching the border in the original. Now count the number of solid objects remaining, and that will be the number of holes in the original.
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