Inspection tasks mean the inspection of targets in a workpiece. Inspection is required to many workpieces, from factory machines to home appliances. The use of Handheld Augmented Reality (HAR) can increase the efficiency because additional information can be directly overlaid to a workpiece. In order for HAR to be considered useful, we need to investigate if HAR enables proper functionality for overlaying virtual content accurately to a workpiece and if it provides any benefits compared to conventional inspection interfaces.
We applied SLAM-based HAR for inspection and conducted five user studies: two focus on 3D positioning and three to visual observation. The contributions of this thesis are related to evaluation of HAR: We are the first to use ray casting in HAR 3D positioning against a device-centric method. We showed that ray casting was more efficient. Secondly, we are the first to apply HAR to visual observation task and prove its higher efficiency over a non-AR picture interface in tasks that require view point alignment and complex mapping.