FILLING Boundary of the irregulay edge (serrated) of binari image

see the white area , on edges have serrated,, picture : <http://tinypic.com/view.php?pic=4q6gw4&s=6>

I need m-file coding ,,, i have a problem,, how to flatten the (serrated) irregulary edge of the image,,, i already used 'imfill'.. imfill it doesnt work,, the edge still irregulary,, i want to flatten the serrated,,

Answer 1

[Walter Roberson]

You are suffering from staircase effect. You need "anti-aliasing". http://www.mathworks.com/matlabcentral/fileexchange/20979 might help.

Answer 2

[Image Analyst]

I usually hear this called "jaggies" http://en.wikipedia.org/wiki/Jaggies It's caused by aliasing. With a higher resolution they will go away, but, of course, you now have a different resolution which is just an artificially made up one. If you use anti-aliasing (averaging), they will also go away but the image will no longer be binary - it will be grayscale.

[Walter Roberson]

With a higher resolution, they do not go away: they just become less noticeable. (Well, at least until the resolution becomes a small rational multiple of the wavelength of light: then you get diffraction effects that make the edge more prominent.)

[Image Analyst]

True.