In image arithmetic, we consider operations such as I(x,y) = A (x,y) o B(x,y) where o is an arithmetic operation such as addition, subtraction, multiplication or division. Here, A and B could be derived from different sources. Such operations are particularly used in modelling image acquisition as a result of a perfect image corrupted with (additive or multiplicative) noise. The noise is often introduced either by a transmission medium or the camera.