The rapid improvement of handheld hardware devices enable real-time rendering of a large number of 3D models in handheld augmented reality (AR) environments. Although there are already many AR applications available for handheld devices, they often remain limited regarding their degree of interactivity compared to desktop AR applications. Important interactions in AR environments are the effortless creation of 3D models, precise selection and six-degree-of-freedom (6DOF) manipulation of virtual objects. Due to the imprecise input of the touch interface, the small screen size and complex touch gestures, all three interactions suffer in one-handed handheld AR setups of different limitations. In this thesis novel one-handed handheld interaction techniques for modeling, selection and manipulation of virtual content are introduced. A simple polygonal modeling technique is presented that uses real-time shape detection to collect handdrawn shapes that are used for Perspective Driven Modeling by extrusion or lathing in an AR environment. The novel selection technique DrillSample, designed particularly for the precise selection and disambiguation of virtual objects, is evaluated against state of the selection techniques. DrillSample is inspired of taking a core sample, e.g. of earth sediments, and designed with a focus on simple touch input and virtual context preservation. Two new and competing manipulation techniques, 3DTouch and HOMER-S, for the intuitive translation, rotation and scaling of virtual objects are introduced. 3DTouch focuses on simple touch input and degree of freedom separation, down to a single DOF, making the different DOF easily accessible from different view perspectives. HOMER-S on the other hand provides integral manipulation up to 6DOF and avoids touch input completely by mapping the handheld´s device pose to the manipulated object. Both techniques are evalulated in a thorough user study followed by a statistical evaluation.
B. Venditti: "Interaction in Dense One-Handed Handheld Augmented Reality"; Supervisor: H. Kaufmann, A. Mossel; Insitute for Software Technology and Interactive Systems, 2015; final examination: 01-15-2015.
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