The visual recognition of shadows by an active observer
The visual recognition of shadows by an active observer
Superior augmented reality registration by integrating landmark tracking and magnetic tracking
SIGGRAPH '96 Proceedings of the 23rd annual conference on Computer graphics and interactive techniques
A Simple Strategy for Calibrating the Geometry of Light Sources
IEEE Transactions on Pattern Analysis and Machine Intelligence
Introductory Techniques for 3-D Computer Vision
Introductory Techniques for 3-D Computer Vision
Introduction to Computer Graphics
Introduction to Computer Graphics
Computer and Robot Vision
Acquiring a Radiance Distribution to Superimpose Virtual Objects onto a Real Scene
IEEE Transactions on Visualization and Computer Graphics
Recent Advances in Augmented Reality
IEEE Computer Graphics and Applications
IEEE Computer Graphics and Applications
Segmentation of soft shadows based on a daylight- and penumbra model
MIRAGE'07 Proceedings of the 3rd international conference on Computer vision/computer graphics collaboration techniques
Graph cut based segmentation of soft shadows for seamless removal and augmentation
SCIA'07 Proceedings of the 15th Scandinavian conference on Image analysis
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In Augmented Reality (AR) real imagery is superimposed by computer graphics renderings of virtual objects. This paper addresses the problem of creating the illusion that the virtual objects cast credible shadows in the real scenario. A step towards this is to be able to detect shadow regions in images of natural scenes, and this paper describes art approach to such shadow detection. The shadow detection can distinguish between directly lit areas, penumbra (hall-shadow) areas, and umbra (full shadow) areas. Furthermore, it is demonstrated how virtual shadows can be created which appear very similar to the real shadows.