How to find number of holes in each connected component?

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Ayesha ch 2016-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/283502-how-to-find-number-of-holes-in-each-connected-component

评论： Image Analyst 2016-5-22

hi i'm new in matlab. I want to find the number of holes in each connected component prior to hole filling. I know the euler number that returns the number of holes in an image as a whole, but i want to find the number of holes in each connected component individually. any help would be appreciated.

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Answer 1

Image Analyst 2016-5-10

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No it doesn't do the whole image. It does it on a blob by blob basis. Just check out regionprops(). The Euler number is just like any other blob-specific measurement you can ask it to make.

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Ayesha ch 2016-5-22

Thankyou so much for the help.I'm using:

n=bwconncomp(S);

h=regionprops(n,'Eulernumber');

Here 'h.EulerNumber' returns 1, -1 and 0 value. I was expecting the actual number of holes, like 10,12 etc. Could you please explain what is meant by 1 and -1? Thankyou.

Image Analyst 2016-5-22

"Returns a scalar that specifies the number of objects in the region minus the number of holes in those objects."

Normally the number of objects in the region is 1. So a solid object would have an Euler number of 1. An object with 1 hole would have an Euler number of 0. An object with 2 holes would have an Euler number of -1.

I see only one object in your image with more than 1 or 2 holes, are you expecting those numbers for more than one or two blobs?

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