How to find minimum distance between two cylindrical objects from binary image?

Question

Naseeb Gill 2017-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/372800-how-to-find-minimum-distance-between-two-cylindrical-objects-from-binary-image

评论： Akira Agata 2018-5-6

采纳的回答： Akira Agata

Hello,

I have this binary image

in which I have two cylindrical objects and I want to find out the minimum distance between these. How to do that? I have read this answer but I cannot understand this. Can anyone help to calculate minimum distance in a more simple way? Thanks.

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Answer 1

Akira Agata 2017-12-16

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https://ww2.mathworks.cn/matlabcentral/answers/372800-how-to-find-minimum-distance-between-two-cylindrical-objects-from-binary-image#answer_296516

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By using bwperim, regionprops and pdist2 functions, you can obtain the minimum distance and corresponding points on each object, like:

% Import your image and binarize
I = imread('aa.jpg');
BW = imbinarize(rgb2gray(I));
% Measure the minimum distance
BW2 = bwperim(BW,8);
stats = struct2table(regionprops(BW2,'PixelList'));
dist = pdist2(stats.PixelList{1},stats.PixelList{2});
[dmin,idx] = min(dist(:));
[r,c] = ind2sub(size(dist),idx);
pt1 = stats.PixelList{1}(r,:);
pt2 = stats.PixelList{2}(c,:);
% Show the result
imshow(BW)
hold on
plot([pt1(1) pt2(1)],[pt1(2) pt2(2)],'r-o','LineWidth',2)
disp(sprintf('Min. distance: %f [pixel]',dmin))

The minimum distance in pixel was measured to be:

Min. distance: 476.822818 [pixel]

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mridul ghosh 2018-5-6

编辑：mridul ghosh 2018-5-6

Sir, pls tell what modification is required in your code in case the distances between more than two objects are needed in an image..

Akira Agata 2018-5-6

在 MATLAB Online 中打开

If your image has N objects, the minimum distance and corresponding points between i th and j th objects can be calculated by modifying the code as follows (note: 1 <= i,j <= N and i ~= j).

dist = pdist2(stats.PixelList{i},stats.PixelList{j});
[dmin,idx] = min(dist(:));
[r,c] = ind2sub(size(dist),idx);
pt1 = stats.PixelList{i}(r,:);
pt2 = stats.PixelList{j}(c,:);

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