Finding neighbors of an object from labeled image

Question

Philip 2011-4-1

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https://ww2.mathworks.cn/matlabcentral/answers/4523-finding-neighbors-of-an-object-from-labeled-image

评论： Alaa 2016-3-1

I have used segmentation and labelling techniques to assign each object within an image a unigue number. For example, the sky will be given label 1, a tree may be given label 2, a person label 3, the ground label 4, and so on...

What I would like to do now is grab all the labels directly neighboring a specific object. For example, if I select the object of interest as label 3 (the person), I want to end up with a list of all the objects that the person directly neighbors. This would be the sky, and the ground (labels 1 and 4), but not the tree (label 2) as this is separated from the person.

Does anyone know of any good efficient methods for achieving this?

Thanks in advance!

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Answer 1

David Young 2011-4-1

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https://ww2.mathworks.cn/matlabcentral/answers/4523-finding-neighbors-of-an-object-from-labeled-image#answer_6314

在 MATLAB Online 中打开

One possibility:

% assume labelled array is called "labelled"
label = 8;  % label of object to find neighbours of
object = labelled == label;
se = ones(3);   % 8-connectivity for neighbours - could be changed
neighbours = imdilate(object, se) & ~object;
neighbourLabels = unique(labelled(neighbours));
disp(neighbourLabels);

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Alaa 2016-3-1

please,How can improve this to find each cell the number of neighbours cells of corneal cells to calculate hexagonality coefficient (pleomorphism) of cells. thanks in advance.

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