# Calculate the distance between objects area using matlab.

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sombat supha on 5 Jan 2020
Commented: Image Analyst on 5 Jan 2020
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

darova on 5 Jan 2020
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

Image Analyst on 5 Jan 2020
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.

sombat supha on 5 Jan 2020
I want to know the size of the white space And you have answered. I accept.
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 on 5 Jan 2020
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'.