contraharmonic and alphatrimmed means of an image

Hello, I am trying to find out how to apply the following to an image using matlab

1- Contra harmonic filter (3*3)

2- Alpha trimmed mean filter with d=5

Answer 1

[Image Analyst]

No idea. Never heard of them. If they're somebody's special filter in some paper, can't you just follow the recipe in the paper? Maybe you could use imfilter (if it's a linear filter), or nlfilter() (for a totally general non-linear filter).