Method and device for representing synthetic environments

• US 20130135310A1
• Filed: 12/12/2011
• Published: 05/30/2013
• Est. Priority Date: 11/24/2011
• Status: Abandoned Application

• Current Assignee: Thales SA
• Original Assignee: Thales SA
• Inventors: JAMES, Yannick
• Application Number:
  US13/323,101
• Publication Number:
  US 20130135310A1
• Time in Patent Office: Days
• US Class Current: 345/427
• CPC Class Codes: G06T 15/20 Perspective computation

Abstract

A method and a device for representing synthetic environments notably comprises a position detector of the observer, a synthesis image generator, and a conformal dynamic transformation module producing a rendering in two dimensions of a scene in three dimensions, said rendering being displayed by a calibrated display device. The invention can be implemented in the field of the simulation of mobile craft such as helicopters, airplanes, trucks.

Claims

1. A method for representing synthetic environments, suitable for viewing by at least one observer, said observer being able to be mobile, from a virtual scene in three dimensions, comprising the following steps:

a step for calibrating a display device for the synthetic representation of the virtual scene;

a step for constructing an initial vision pyramid;

a step for describing the physical characteristics (61) of the display device;

a first step for determining an observation position on each movement of the observer;

a second step for calculating a new dynamic vision pyramid according to the observation position, said new dynamic vision pyramid resulting from a dynamic conformal transformation calculation;

a third step for calculating a rendering in two dimensions of the virtual scene in three dimensions by a function of conformal dynamic transformation rendering calculation taking into account the new dynamic vision pyramid;

a fourth step for displaying, by a calibrated display device, the rendering in two dimensions of the virtual scene.

2. The method as claimed in claim 1, further comprising a step for calculating a dynamic distortion according to the observation position, followed by a step for applying the dynamic distortion to the rendering in two dimensions of the virtual scene, calculating a new rendering conforming to the conical perspective.

3. The method as claimed in claim 1, wherein the first step for determining an observation position comprises a step for detecting a new position of the observer, a step for calculating a new observation position.

4. The method as claimed in claim 3, wherein the observation position is deduced from a detection of a new position of the head of the observer.

5. The method as claimed in claim 3, wherein the observation position is deduced from a detection of a new position of the eyes of the observer.

6. The method as claimed in claim 1, wherein the initial vision pyramid:

is oriented according to an initial line of sight, said initial line of sight being substantially perpendicular to a screen of the display device;

has for its origin an initial observation position;

defines an initial display area by its intersection with the screen.

7. The method as claimed in claim 6, wherein the dynamic vision pyramid is calculated by determining its four angles between the corners of an initial display area, the position of the observer and a line of sight projected on to axes substantially parallel to the edges of the initial display surface.

8. The method as claimed in claim 6, wherein the dynamic vision pyramid is calculated by minimizing its aperture so as to encompass the initial display surface.

9. A device for representing synthetic environments, suitable for being viewed by at least one observer, said observer being able to be mobile, from a virtual scene in three dimensions, said device comprising at least:

a detector of positions of the observer;

a synthesis image generator, comprising;

at least one database storing an initial vision pyramid, the virtual scene in three dimensions;

at least one graphics processor calculating a first rendering in two dimensions of the scene in three dimensions from a dynamic vision pyramid;

a module for calculating a conformal dynamic transformation taking as input the initial vision pyramid, a physical description of the display device and supplying the graphics processor with the dynamic vision pyramid, calculated according to an observation position deduced from a position of the observer;

a calibrated display device displaying the first rendering in two dimensions of the scene in three dimensions.

10. The device as claimed in claim 9, further comprising a dynamic distortion operator taking as input the rendering in two dimensions of the scene in three dimensions and applying a dynamic distortion according to physical characteristics of the display device and the observation position so as to produce a second rendering in two dimensions conforming to the conical perspective, said rendering in two dimensions being displayed by the calibrated display device.