how can i remove object bigger than x pixel

25 views (last 30 days)
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 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.
Ankit Sahay
Ankit Sahay on 8 May 2020
What does the second line do? The line where you have written:
BW = I>80;

Sign in to comment.

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


Find more on Images in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by