The aim of this practical session is to gain familiarity with techniques for noise estimation and removal.
Add various amounts of noise to the image as you have done in previous practical (i.e. use the random image generator in the create tool). Use noise button in the imcalc tool to estimate the level of image noise. Test the technique on several images until you can recover the value you have added reliably and feel you can trust the technique. You may feel you need to modify the basic technique in order to get accurate results, feel free to do so.