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Pixels want to be freed!Introducing Augmented Realityenabling hardware technologiesBy Jouke Verlinden1. IntroductionFrom the early head-up display in the movie“Robocop” to the present, Augmented Reality(AR) has evolved to a manageable ICT environmentthat must be considered by product designersof the 21st century.Instead of focusing on a variety of applicationsand software solutions, this article will discussthe essential hardware of Augmented Reality(AR): display techniques and tracking techniques.We argue that these two fields differentiate ARfrom regular human-user interfaces and tuningthese is essential in realizing an AR experience.As often, there is a vast body of knowledge behindeach of the principles discussed below,hence a large variety of literature references isgiven.Furthermore, the first author of this articlefound it important to elude his own preferencesand experiences throughout this discussion.We hope that this material strikes a chord andmakes you consider employing AR in your designs.After all, why should digital informationalways be confined to a dull, rectangular screen?42 43