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Real-time view-dependent image warping to correct non-linear distortion for curved virtual showcase display

: Bimber, O.; Fröhlich, B.; Schmalstieg, D.; Encarnacao, L.M.


Computers and Graphics 27 (2003), No.4, pp.515-528
ISSN: 0097-8493
Journal Article
Fraunhofer IGD ()
display algorithm; viewing algorithm; virtual and augmented reality (VR/AR); geometric transformation

We present a quadtree-based selective refinement algorithm for real-time, view-dependent image warping used to present images with mirror displays that require a non-linear predistortion. The algorithm applies two-pass rendering, and recursively generates and selectively refines the underlying image grid with locally adapted levels of detail. Each discrete level of detail is determined by computing and evaluating the displacement error on the image plane within the image space of the mirror optics. The algorithm generates and refines only those image portions that contain visible information by considering an oriented convex container of the rendered scene. While display specific details of the algorithm are explained based on the more complex case of a particular mirror display, the Virtual Showcase its general functionality is valid for other non-linear displays.