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how can i remove object bigger than x pixel

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Lukasz Jarod
Lukasz Jarod on 18 Dec 2014
Commented: Ankit Sahay on 8 May 2020
i know that bwareaopen remove small elements , but how can i remove object bigger than x pixels???
i want to just the letter to stay so how can i remove that 2 big objects???

Accepted Answer

Sven
Sven on 18 Dec 2014
Edited: Sven on 18 Dec 2014
Hi Lukasz,
Here's an example that removes all objects greater than 1000 pixels in area. You probably have your own BW image and your own threshold that you can use in a similar way.
I = imread('rice.png');
BW = I>80;
cc = bwconncomp(BW);
stats = regionprops(cc);
threshold = 1000;
removeMask = [stats.Area]>threshold;
BW(cat(1,cc.PixelIdxList{removeMask})) = false;
Did this help you out?
Thanks, Sven.
  2 Comments
Ankit Sahay
Ankit Sahay on 8 May 2020
What does the second line do? The line where you have written:
BW = I>80;

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More Answers (1)

William Kemp
William Kemp on 1 Aug 2017
Its a little more compact if you use the built in function for it:
BW2 = bwpropfilt(BW,'Area',[0 x_pixels])
Where x_pixels is the maximum desired number of pixels in a BW object

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