Optics approach to low side compliance simulation

• US 5,228,856 A
• Filed: 02/11/1991
• Issued: 07/20/1993
• Est. Priority Date: 02/11/1991
• Status: Expired due to Term

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Chang, David B., Shih, I-Fu
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Cheng, Joe H.
• Application Number:
  US07/653,530
• Time in Patent Office: 890 Days
• Field of Search: 434/29, 434/30, 434/38, 434/43, 434/44, 434/69, 358/104, 358/93, 358/125, 353/8, 353/11, 353/44, 353/75, 353/68, 353/66, 353/98, 353/99, 353/81, 353/31, 353/32, 353/33, 353/37, 356/241, 356/445, 250/223 B, 250/224, 250/572, 340/702, 359/847, 359/849
• US Class Current: 434/44
• CPC Class Codes: G09B 9/326 the image being transformed by optical means
• CPC Class Codes: H04N 13/10 Processing, recording or transmission of stereoscopic or multi-view image signals
• CPC Class Codes: H04N 13/261 with monoscopic-to-stereoscopic image conversion
• CPC Class Codes: H04N 13/30 Image reproducers optical systems for producing stereoscopic or other three-dimensional effects G02B30/00
• CPC Class Codes: H04N 2013/0081 Depth or disparity estimation from stereoscopic image signals

Abstract

A low cost visual simulation system (100) for training simulators is disclosed. Aerial photo transparencies are used directly as image sources without creating a digital data base. The approximately correct image perspective is generated optically by a deformable mirror (114) and a zoom lens and rotation prism assembly (106). Stereo image photo pairs (120) need to be analyzed only at a relatively small number of points; thus, the computational burden is greatly reduced.

Claims

1. A visual simulation system, comprising:

a library of photographic transparencies, said transparencies covering the area to be visually simulated; and

an optical projector system section, comprising;

a zoom lens;

a rotation prism;

means for projecting at least a portion of the image on a selected one of said transparencies through said lens and said prism to present an image of proper scale and orientation at a first image plane of the projector system; and

a deformable mirror arranged to present an image with proper image perspective at a second image plane of the projector system; and

a controller section comprising;

means for adjusting the zoom lens to provide the desired scale of the projected image;

means for adjusting the rotation prism to provide the desired orientation of the projected image; and

means for deforming the mirror so as to provide the desired perspective of the projected image.

2. The system of claim 1 wherein said projecting means comprises means for projecting only a selected part of said transparency image through said lens and said

3. The system of claim wherein said system is capable of simulating a dynamically changing scene seen by a moving object.

4. The system of claim 3 wherein said means for adjusting said zoom lens, means for adjusting said prism and said means for deforming said mirror are dynamically controlled in dependence on the particular location of said object.

5. The system of claim 4 further characterized in that said system is employed in a flight simulator to project simulated images in accordance with simulated flight data.

6. The system of claim 5 wherein said controller further comprising a system processor for controlling said zoom lens adjusting means, said rotation prism adjusting means and said mirror deforming means in dependence on said simulated flight data.

7. The system of claim 6 further comprising means controlled by said controller for selecting a particular one of said photographic transparencies in dependence on said flight data.

8. The system of claim 7 wherein said controller further comprises means for storing three-dimensional (3-D) data for a selected limited point set regarding said selected photographic transparency, said 3-D data determined from a stereo photograph pair of the image carried by said transparency, and said 3-D data is employed by said processor to determine the adjustments needed to adjust said deformable mirror in dependence on said flight data.

9. A visual simulation system which can be manipulated to generate dynamically changeable scenes of a geographic area, characterized by:

a library of aerial image transparencies which collectively cover said geographic area;

for each of said transparencies, a set of three-dimensional (3-D) data for a limited number of points over said transparency image;

means for generating simulated position and motion data for controlling the manipulation of said scenes of said geographic area;

an optical projector means, comprising a zoom lens, a rotation prism, means for projecting at least a portion of the image on a selected one of said transparencies through said lens and said prism to present an image of proper scale and orientation at a first image plane of said projector means, and a dynamically deformable mirror arranged to present an image with proper image perspective at a second image plane of said projector means; and

a processor and controller means, comprising means responsive to said simulated position and motion data and to said 3-D data for adjusting said zoom lens to provide the proper scale of the projected image, means for adjusting the rotation prism to provide the proper orientation of the projected image, and means for deforming the mirror so as to provide the proper perspective of the projected image.

10. The system of claim 9 further characterized in that said system is employed in a flight simulator to project simulated images in accordance with simulated flight data comprising said simulated position and motion data.