The paper presents two rule-based information extraction (IE) from two types of patients’ documentation in Polish. For both document types, values of sets of attributes were assigned using specially designed grammars. 1 Method/General Assumptions Various rule-based, statistical, and machine learning methods have been developed for the purpose of information extraction. Unfortunately, they have ...

We present a new efficient collision-handling technique of free-form deformation (FFD) of an embedded surface. By adapting FFD, modeling deformation has been substantially simplified to make possible interactive rate animation of a deformable object even for a complex embedded mesh. However, the lack of effective collision detection and resolution schemes for an FFD-embedded surface hinders the...

This paper introduces a new free-form surface representation scheme for the purpose of fast and accurate registration and matching. Accurate registration of surfaces is a common task in computer vision. The proposed representation scheme captures the surface curvature information, seen from certain points and produces images, called surface signatures, at these points. Matching signatures of di...

This paper describes the use of a previously developed surface model for representing 3D geometric information that is subject to uncertainty. The proposed model is based on a geometric data fusion technique that allows the efficient approximation of arbitrary triangular meshes in space with smooth surfaces. This paper shows how the shape modifiers defined in that model can be used to represent...

A novel technique for multi-scale smoothing of a freeform 3-D surface is presented. Complete triangulated models of 3-D objects are constructed at our center [4] and using a local parametrization technique, are then smoothed using a 2-D Gaussian filter. Our method for local parametrization makes use of semigeodesic coordinates as a natural and efficient way of sampling the local surface shape. ...

This paper presents a survey of techniques used for function approximation and free form surface reconstruction. A comparative study is performed between classical interpolation methods and two methods based on neural networks. We show that the neural networks approach provides good approximation and provides better results than classical techniques when used for reconstructing smoothly varying...

In most of the graphics and design systems shape modification of free form surfaces is based on control point adjustment. Although this technique may work well, it is not sufficiently intuitive for a creative designer. Maintaining shape and design constraints can also be difficult. We propose a technique which is suitable to intuitively modify the shape of a parametric B-spline surface by embed...

It is widely appreciated that 3D structures may be computed from multiple 2D images of the same scene given point correspondences between images. We review the process from a projective geometry perspective. Of greater interest, however, is the generation of surfaces that give a compact representation of the geometric model. Assuming we are dealing with smooth surfaces, we show that B-spline is...

This paper presents a new approach to rendering triangular algebraic free form surfaces. A hierarchical subdivision of the surface with associated tight bounding volumes provides for quick identification of the surface regions likely to be hit by a ray. For each leaf of the hierarchy an approximation to the corresponding surface region is stored. The approximation is used to compute a good star...

The representation, matching and analysis of objects of interest are of prime importance in shape-based retrieval systems. Considering that these systems involve analysis of various complex shapes, an accurate representation of free form shape is required. A simple and accurate shape representation procedure would ensure meaningful results from the shape-based retrieval systems. Motivated by th...