Education and demonstration – Vehicle operator instruction or testing – Flight vehicle
Patent
1987-01-28
1987-12-22
Picard, Leo P.
Education and demonstration
Vehicle operator instruction or testing
Flight vehicle
340723, G09B 900
Patent
active
047144289
ABSTRACT:
A method for computer image generation producing simulated visual scenes for applications such as flight training, employing a comprehensive distortion correction to generate the image takes place in three sequential stages: Controller, Geometry Processor, and Display Processor. The Display Processor generates video to produce the desired scene on the raster of the display device. If the scene is projected through a wide-angle lens and/or is projected onto a curved screen, the combination of optical and geometric distortion presents a highly distorted scene to the viewer. The comprehensive distortion correction method produces a precisely predistorted scene on the projector raster so it appears valid to the viewer. Mapping between projector space and viewer space is highly nonlinear. However, a small region of the display (span) is selected sufficiently small so that the projector/viewer transformation may be considered linear. The Geometry Processor defines face edges in viewer space and maps edge vertices into projector space. In the Display Processor detection of spans intersected by a given face is done in viewer space using the mapped span corners and edge coefficients defined by the Geometry Processor. Edge to span corner distances are determined in viewer space. This produces a piecewise linear approximation to the curves which exact mapping would provide. The edges are continuous at span boundaries and have slope discontinuities so small as to be imperceptable. The resulting scene appears fully valid to the viewer, with all distortions corrected.
REFERENCES:
patent: 4550315 (1985-10-01), Bass et al.
patent: 4590465 (1986-05-01), Fuchs
patent: 4656521 (1987-04-01), Trzeciak et al.
Bunker William M.
Merz Donald M.
Checkovich Paul
General Electric Company
Picard Leo P.
Young Stephen A.
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