2. The method of claim 1 , wherein, for at least a second iteration, the computing of the refined page category scores for each of the set of categories for the current page comprises computing further refined page category scores based on the previously-computed refined page category scores for each of the set of categories and the first and second boundary probabilities.
3. The method of claim 2 , wherein the computing of the further refined page category scores comprises: computing refined page category scores for each of the set of categories for the current page as a function of: the prior computed refined category scores for the previous page weighted by the first weighting factor; the prior computed refined category scores for the subsequent page weighted by the second weighting factor; and the prior computed refined page category scores of the current page.