what function do i use to remove large object ?

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Priyanka Roy
Priyanka Roy 2015-6-2
评论： Image Analyst 2020-11-2
In matlab we use bwareaopen(I,n) function to remove object smaller than n pixel from image I.
Is there any function to remove object greater than m pixel from image I ?
what should i do to remove bigger object from image I?

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回答（3 个）

Image Analyst
Image Analyst 2015-6-2
You can do it with bwareaopen():
bigBlobs = binaryImage - bwareaopen(binaryImage, n);
A nice versatile function for extracting the N largest or smallest blobs is contained in my attached demo.
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Xihao Han
Xihao Han 2020-11-2
@Image Analyst hahaha "3" in Chinese is pronounced like "than" while "Q" is like "k you"
Image Analyst
Image Analyst 2020-11-2
Thanks for the explanations on the cryptic Chinese textspeak.
Regarding the original question, since MATLAB Release R2014b there is a function called bwareafilt(), as the others have mentioned. Here is how you would use it to "remove object greater than m pixel from image I ?"
% Remove objects greater than m pixels in area from image I.
bigBlobs = bwareafilt(I, [1, m]); % Keep only blobs from 1 pixel to m pixels in area.
I really recommend you use more descriptive vatiable names. No one wants to look at an alphabet soup of a program with single letter variables, where it's not clear what they are. I'd recommend you not use I (eye) because it looks too much like 1 (one) and l (ell). I recommend you call it either binaryImage or mask. And instead of m, call it maxAllowableBlobSize. Then, someone reading that code will instantly know what the variables are.

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Walter Roberson
Walter Roberson 2018-8-27
bwareafilt()
Romana Akhter
Romana Akhter 2020-9-18
You can use bwareafilt(image, range). Here rang is the size of the objects you want to keep. See the link for details.
https://www.mathworks.com/help/images/ref/bwareafilt.html

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