How to count area under given surface ?

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MMSAAH 2020-4-30

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https://ww2.mathworks.cn/matlabcentral/answers/521999-how-to-count-area-under-given-surface

评论： Ameer Hamza 2020-5-4

采纳的回答： Ameer Hamza

area.JPG

Hello,

I want to count areas limited by green lines.

So, for my image the result is three areas.

Can anyone help me please.

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darova 2020-4-30

do you have coordinates of green lines?

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Ameer Hamza 2020-4-30

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编辑：Ameer Hamza 2020-4-30

在 MATLAB Online 中打开

Try this. It gives the area of three regions in number of pixels

im = im2double(imread('area.jpeg'));
im(:,end-5:end,:) = 0; % remove the white line at right and bottom of image
im(end-5:end,:,:) = 0;
mask = (im(:,:,1)>0.75) & (im(:,:,2)>0.75) & (im(:,:,3)>0.75);
regions = bwconncomp(mask);
areas = cellfun(@(x) numel(x), regions.PixelIdxList);
required_areas = maxk(areas, 3);

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MMSAAH 2020-5-4

在 MATLAB Online 中打开

I'm using R2016a.

I've changed maxk() by :

[val ind] = sort(areas,'descend');
required_areas=val(1:3);

Now, it works.

Is it possible to transform the number of pixels to cm ?

Ameer Hamza 2020-5-4

You will need to specify the pixel per cm to find out the area.

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