2 research outputs found
Model-Based Tracking Initialization in Ship Building Environment
An augmented reality (AR) device must know observerās location and orientation, i.e. observerās pose, to be able to correctly register the virtual content to observerās view. One possible way to determine and continuously follow-up the pose is model-based visual tracking. It supposes that a 3D model of the surroundings is known and that there is a video camera that is fixed to the device. The pose is tracked by comparing the video camera image to the model. Each new pose estimate is usually based on the previous estimate. However, the first estimate must be found out without a prior estimate, i.e. the tracking must be initialized, which in practice means that some model features must be identified from the image and matched to model features. This is known in literature as model-to-image registration problem or simultaneous pose and correspondence problem. This report reviews visual tracking initialization methods that are suitable for visual tracking in ship building environment when the ship CAD model is available. The environment is complex, which makes the initialization non-trivial. The report has been done as part of MARIN project.Siirretty Doriast
3D Mesh Simplification. A survey of algorithms and CAD model simplification tests
Simpliļ¬cation of highly detailed CAD models is an important step when CAD
models are visualized or by other means utilized in augmented reality applications.
Without simpliļ¬cation, CAD models may cause severe processing and storage is-
sues especially in mobile devices. In addition, simpliļ¬ed models may have other
advantages like better visual clarity or improved reliability when used for visual pose
tracking. The geometry of CAD models is invariably presented in form of a 3D
mesh. In this paper, we survey mesh simpliļ¬cation algorithms in general and focus
especially to algorithms that can be used to simplify CAD models. We test some
commonly known algorithms with real world CAD data and characterize some new
CAD related simpliļ¬cation algorithms that have not been surveyed in previous mesh
simpliļ¬cation reviews.Siirretty Doriast