1. An image processing method for categorising elements ( 16 ) in an image ( 10 ) of a body fluid sample, the method comprising the steps of generating probability maps ( 11 1-n ) in association with each of categories on a basis of visual information detectable in the image ( 10 ), the probability map ( 11 ) showing presence probability distribution of an element ( 16 ) of the given category, and making decision in respect of presence of elements ( 16 ) of the categories on the basis of analysing the probability maps ( 11 1-n ), characterized by examining for each category whether there are presumably present elements in the image ( 10 ), and in making the decision regarding the presence of each presumably present element ( 16 ), at least one further probability map ( 11 ) in addition to the probability map ( 11 ) associated with the category of the element ( 16 ) is taken into account.