minimum distance between 2 objects

Question

Walaa 2022-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/1857038-minimum-distance-between-2-objects

回答： Image Analyst 2022-11-20

I plotted boundries with bwboundries and smoothed them with the sgolay filter then plotted these boundries over RGB image. Could you kindly help me in finding the shortest distance between these two boundaries (the shortest distance of the area in-between the red and yellow lines)?

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Answer 1

Walter Roberson 2022-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/1857038-minimum-distance-between-2-objects#answer_1105798

在 MATLAB Online 中打开

Trace the boundaries of the two objects. https://www.mathworks.com/help/images/boundary-tracing-in-images.html

Then with the coordinates of each point for each of the two objects, use pdist2() and then min()

If you do not have Statistics and Machine Learning Toolbox for pdist2() you can use

D = sqrt((x1(:) - x2(:).').^2 + (y1(:) - y2(:).').^2);

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Answer 2

Image Analyst 2022-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/1857038-minimum-distance-between-2-objects#answer_1106078

在 MATLAB Online 中打开

If xy is an N by 2 array of (x,y) coordinates, then (untested)

allDistances = pdist2(xy1, xy2);
minDistance = min(allDistances(:))
% Find index of closest pair
[row, column] = find(allDistances == minDistance);
% Draw a line between them
x1 = xy1(row, 1);
y1 = xy1(row, 2);
x2 = xy2(col, 1);
y2 = xy2(col, 2);
hold on;
line([x1, x2], [y1, y2], 'LineWidth', 2, 'Color', 'b')