how can i remove object bigger than x pixel

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Lukasz Jarod
Lukasz Jarod am 18 Dez. 2014
Kommentiert: Ankit Sahay am 8 Mai 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???

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Sven
Sven am 18 Dez. 2014
Bearbeitet: Sven am 18 Dez. 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 Kommentare
Image Analyst
Image Analyst am 20 Dez. 2014
Lukasz's Flag removed and moved here as a comment:
Yes, it helped me.
Ankit Sahay
Ankit Sahay am 8 Mai 2020
What does the second line do? The line where you have written:
BW = I>80;

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William Kemp
William Kemp am 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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