How to count area under given surface ?

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MMSAAH
MMSAAH 2020-4-30
评论： Ameer Hamza 2020-5-4
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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Ameer Hamza
Ameer Hamza 2020-4-30
编辑：Ameer Hamza 2020-4-30
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
MMSAAH 2020-5-4
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
Ameer Hamza 2020-5-4
You will need to specify the pixel per cm to find out the area.

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