MATLAB Central Newsreader - imfill(image,'holes',sizeHoles)

imfill(image,'holes',sizeHoles)

Mario — Thu, 24 Jul 2008 03:01:02 -0400

Hi.
Is there any way to select the holes I want to fill?
I'd like to fill just the holes smaller than a certain size
(say 100 pixels), so I was wondering if there is a way to do
that. Possibly without using imdilate and imerode (because
using these commands it can happen that i fill holes that i
want to keep).
Thanks for your help!

M.

Re: imfill(image,'holes',sizeHoles)

Steve Eddins — Thu, 24 Jul 2008 12:29:07 -0400

Mario wrote:
> Hi.
> Is there any way to select the holes I want to fill?
> I'd like to fill just the holes smaller than a certain size
> (say 100 pixels), so I was wondering if there is a way to do
> that. Possibly without using imdilate and imerode (because
> using these commands it can happen that i fill holes that i
> want to keep).
> Thanks for your help!
>
> M.

Interesting question.

Try something like this:

1. Fill all holes using imfill

   filled = imfill(original, 'holes');

2. Identify filled pixels using logical operators:

   holes = filled & ~original;

3. Use bwareaopen to eliminate connected components in the holes image
smaller than your threshold.

   bigholes = bwareaopen(holes, 100);

4. Use logical operators to identify small holes:

   smallholes = holes & ~bigholes;

5. Use logical operator to fill in identified small holes:

   new = original | smallholes;

---
Steve Eddins
http://blogs.mathworks.com/steve/

Re: imfill(image,'holes',sizeHoles)

Pete — Sat, 30 Aug 2008 11:58:02 -0400

Hi,

I did this using,

new = ~bwareaopen(~original, 100);

The results are not quite the same - in contrast to imfill, this method will also
fill in holes occurring at the image boundary, which may or may not be
desirable.