how can i remove object bigger than x pixel

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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???

Risposta accettata

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

Accedi per commentare.

Più risposte (1)

William Kemp
William Kemp il 1 Ago 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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