How can I remove noise from an image with Matlab?

I need to remove the noise from this image using matlab http://www.flickr.com/photos/63036721@N02/5742366240/in/photostream

The aim is to improve the quality of the coins and, if it is possible, to see the shape inside them.

I thought that maybe it is a 开发者_运维技巧gaussian noise so I tried to use the Wiener filter but it don't work so good. Is really gaussian noise?

Thanks

This is salt and pepper noise. Apply a median filter. It should work.

http://www.mathworks.com/help/toolbox/images/ref/medfilt2.html