how can i remove object bigger than x pixel

i know that bwareaopen remove small elements , but how can i remove object bigger than x pixels???

http://www.image-share.com/ijpg-2791-262.html

i want to just the letter to stay so how can i remove that 2 big objects???

Answer 1

[Sven]

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.

[Image Analyst]

Lukasz's Flag removed and moved here as a comment:

Yes, it helped me.

[Ankit Sahay]

What does the second line do? The line where you have written:

BW = I>80;

Answer 2

[William Kemp]

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