Showing papers by "Sabry F. El-Hakim published in 2001"

Real-time geometrical tracking and pose estimation using laser triangulation and photogrammetry

Abstract: Geometrical tracking and pose estimation using the homogeneous UVW inverse spherical coordinate system, directly from range data obtained from a triangulation based range sensor, are demonstrated. The method is shown to be more accurate, reliable, and computationally faster than using the more conventional XYZ Cartesian coordinate system. This is presented through a practical application, by comparing the accuracy and resolution of a 3D laser scanner prototype that geometrically tracks and computes the relative pose of objects in 3D space. The system uses real-time geometrical surface fitting and intensity processing for the detection and tracking of planar targets on an object. A dual-axis laser scanner is used for this demonstration that combines optical triangulation, Lissajous scanning patterns, geometrical tracking, and photogrammetry (spatial resection), to calculate the relative pose of objects in the 3D space.

The Virtual Museum: Virtualisation of Real Historical Environments and Artefacts and Three-Dimensional Shape-Based Searching

Abstract: An intuitive technique for managing three-dimensional objects by shape is presented. This technique is applied to the Virtual Museum in the framework of heritage applications. The Virtual Museum is a virtual reality-based museum that allows the public to visualise, compare, manipulate and search the collection with an intuitive query by shape paradigm. The artefacts and the museum are virtualised with laser scanners and photogrammetric techniques. A high degree of realism can be attained by those techniques and the context in which the artefacts were discovered or were used can be recreated.