Any piece of printed paper, designed to be affixed on a wall or a vertical surface is called a poster. Posters are typically printed with both, textual and graphical elements. Here, the textual elements may include messages, slogans or brand names in human readable languages. On the other hand, graphical elements consist of logos, cartoons, signs and attractive symbols. Moreover, a poster may be either completely graphical or wholly textual depending on the kind of information being printed.