We present the visualization and modeling techniques used in a case study to build feature-based computational models from geophysical data. Visualization was used to inspect the quality of the interpretation of the geophysical data. We describe the geophysical data graphical representation used to support rapid rendering and to enhance the perception differences between the interpretation of the data and the data itself. In addition, we present the modeling techniques used to convert the geophysical data into a feature-based computational model suitable for use by a numerical simulation package.>

This paper describes a new methodology for specifying and constructing complex interaction dialogs for the design of user interfaces. The method is new in that it promotes a decomposition of the interaction in terms of events in AND/OR graphs called Event-Decomposition Graphs (EDG). These Event-Decomposition Graphs can be progressively refined to capture the detailed semantics of the dialog. Multithreaded interaction can be composed by joining several Event-Decomposition Graphs together in a systematic way. In this paper we present a design tool for specifying and analyzing Event-Decomposition Graphs, and show that the combination of the notation and tool combines many of the capabilities of Context-Free Grammar- and Event-Notations while still providing the graphical view of Transition Network diagrams.

The representation and processing of images at multiple levels of resolution is primarily used as a computational tool in image processing. Multi-resolution techniques have been used successfully for edge enhancement, data compression and transmission, and for planning, that is, images processed at a low resolution are used as a guide for processing and detecting features at a higher resolution. In this paper we generalize the methodology of 2D multi-resolution techniques to 3D, and then show some of the applications of the multiresolution technique for band-pass filtering, feature detection, and image enhancement.

This paper describes a procedure for modeling motion blur in computer-generated images. Motion blur in photography or cinematography is caused by the motion of objects during the finite exposure time the camera shutter remains open to record the image on film. In computer graphics, the simulation of motion blur is useful both in animated sequences where the blurring tends to remove temporal aliasing effects and in static images where it portrays the illusion of speed or movement among the objects in the scene.

a LensThis paper extends the traditional pinhole camera projection geometry used in computer graphics to a more realistic camera model which approximates the effects of a lens and an aperture function of an actual camera.This model allows the generation of synthetic images which have a depth of field and can be focused on an arbitrary plane; it also permits selective modeling of certain optical characteristics of a lens.The model can be expanded to include motion blur and special-effect filters.These capabilities provide additional tools for highlighting important areas of a scene and for portraying certain physical characteristics of an object in an image.

This paper extends the traditional pin-hole camera projection geometry, used in computer graphics, to a more realistic camera model which approximates the effects of a lens and an aperture function of an actual camera. This model allows the generation of synthetic images which have a depth of field, can be focused on an arbitrary plane, and also permits selective modeling of certain optical characteristics of a lens. The model can be expanded to include motion blur and special effect filters. These capabilities provide additional tools for highlighting important areas of a scene and for portraying certain physical characteristics of an object in an image.

A line and junction labeling scheme is introduced that is valid for both planar and curved-surface bodies. Seven generalized junction types are defined and shown to cover all valid projections for a wide class of planar and curved-surface bodies. It is further shown that there are limitations on the permissible junction types as one moves from one end of a line segment to the other. The valid junction transitions provide 1) a new set of edge semantics for line labeling and 2) an ability to verify whether a given sequence of junctions forms a realizable configuration.