Calculate the distance between objects area using matlab.

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sombat supha 2020-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/498956-calculate-the-distance-between-objects-area-using-matlab

评论： Image Analyst 2020-1-5

I want to know the distance H (highest vertical) and L (longest horizontal) as shown in the picture A1.jpg in the white part. How to write a program using matlab?

A1.jpg

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Answer 1

darova 2020-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/498956-calculate-the-distance-between-objects-area-using-matlab#answer_408718

在 MATLAB Online 中打开

Use this

I1 = edge(I);
[m,n] = size(I1);
ldist = zeros(1,m);
for i = 1:m
    ind = find(I1(i,:));                % find indices of boundary
    if ~isempty(ind)
        ldist(i) = max(ind)-min(ind);   % find difference
    else
        ldist(i) = 0;
    end
end
max(ldist)    % longest distance

The same for longest height

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Answer 2

Image Analyst 2020-1-5

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https://ww2.mathworks.cn/matlabcentral/answers/498956-calculate-the-distance-between-objects-area-using-matlab#answer_408730

在 MATLAB Online 中打开

How is this different than the question you asked here: https://www.mathworks.com/matlabcentral/answers/498831-calculate-the-distance-l-distance-h-and-circumference-boundary#answer_408690 ?

I gave you a compact solution there:

props = regionprops(binaryImage, 'BoundingBox', 'Perimeter');
width  = props.BoundingBox(3);  % Horizontal distance.
height = props.BoundingBox(4);  % Vertical distance.

If you wanted to use find(), you can do it like this, rather than with a for loop

[rows, columns] = find(binaryImage);
width = max(columns) - min(columns);
height = max(rows) - min(rows);

Also you need to decide if width is counting pixels, or going from center to center of pixels. So, does this array [0, 1, 1, 1 , 0] have a width of 3 or 2? To answer, you might need to know the physics/optics of how your image was generated.

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sombat supha 2020-1-5

First your question

I want to know the size of the white space And you have answered. I accept.

In my question on this page

I want to know the distance H (highest vertical) and L (the longest horizontal) in the white area. I accept. Thank you very much for answering my question.

Image Analyst 2020-1-5

In your other question you wanted to know the width and height (same as here) and perimeter. If you want to know the size (area) of the white region, you'll have to ask regionprops() for 'Area'.

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