Eye line-of-sight responsive wide angle visual system

• US 4,479,784 A
• Filed: 03/03/1981
• Issued: 10/30/1984
• Est. Priority Date: 03/03/1981
• Status: Expired due to Term

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Singer Company (SVP Holdings Ltd.)
• Inventors: Peters, David L., Mallinson, Richard B., Mecklenborg, Richard A., Lakshminarayanasetty, Kadam S.
• Primary Examiner(s): Grieb, William H.
• Application Number:
  US06/239,942
• Time in Patent Office: 1,337 Days
• Field of Search: 434/43, 434/44, 434/34
• US Class Current: 434/43
• CPC Class Codes: G09B 9/302 the image being transformed by computer processing, e.g. updating the image to correspond to the changing point of view
• CPC Class Codes: G09B 9/307 by helmet-mounted projector or display G09B9/36 takes precedence; optical parts of head-up displays G02B27/01

Abstract

Visual system (37) for providing high detail, high resolution imagery anywhere a trainee is looking throughout a wide field of view. An image generation system (38) of visual system (37) accepts inputs from a helmet mounted oculometer system (30) which determines a trainee'"'"'s instantaneous eye line-of-sight. The image generation system (38) provides a foveal view of high detail, high resolution imagery at the eye line-of-sight. The foveal view is projected on a screen (46) by a foveal projection system (40). The image generation system (38) further provides a peripheral view of low detail, low resolution imagery that is projected on screen (46) by a peripheral projection system (42). The foveal view is merged with the peripheral view by a merge electronics system (44).

Claims

1. In a simulator, a visual system for generating a high-resolution visual image over a wide field of view comprising:

image display means;

computer image generator;

means connected to said computer image generator for projecting a visual image of high resolution onto said image display means, the area of said high resolution image being sized to accommodate the foveal viewing area of an observer observing said image display means;

means connected to said computer image generator for projecting a visual image of low resolution onto said image display means encompassing said high-resolution image and sized to accommodate the peripheral viewing area of said observer;

means for merging said high resolution image and said low-resolution image to enhance the optical realism of the overall image, both foveal and peripheral views of the observer;

means for continuously locating the observer'"'"'s eye line-of-sight relative to a position on said image display means; and

means for continuously positioning the high resolution image substantially at the observer'"'"'s eye line-of-sight on said display means such that the high resolution image will be encompassed in the foveal viewing area of the observer regardless of where the observer is looking, the transition time of repositioning the high-resolution image from one point on said image display means to another point on the image display means being less than the saccadic suppression time of the observer.

2. A visual system as in claim 1, including:

said low-resolution projection means being fixed relative to said image display means, said high-resolution image projection means including a means for moving the image about the image display means in azimuth and elevation.

3. A visual system as in claim 2, wherein:

said image display means includes a portion of a spherical concave screen, said system including a scan conversion means for eliminating image distortion on said concave spherical screen connected to said computer image generator.

4. A visual system as in claim 1, wherein:

said means for continually locating the observer eye line-of-sight relative to a position on said image display means includes an eye-tracking means, a helmet, a means for tracking the eye line-of-sight of an observer wearing the helmet relative to the helmet, and a means connected to the helmet for measuring the relative movement and attitude of said helmet relative to a predetermined image display means whereby the information of the eye line-of-sight of an observer wearing the helmet, relative to the helmet, and the helmet'"'"'s relative position and attitude will provide information for continuously locating the observer'"'"'s eye line-of-sight relative to a position on said image display means.

5. A visual system as in claim 1 wherein said foveal high-resolution projection means includes:

means for providing zoom focus optics to said high-resolution image;

means for providing deflection of said projected image in azimuth and elevation including a servo means for moving said deflection assembly means in azimuth and elevation whereby the foveal projection means can focus and move the high-resolution image faster than the saccadic suppression of the observer.

6. A visual system for a simulator, said visual system employing a computer image generator for providing a visual image of high resolution to an observer over a wide field-of-view comprising:

an image display screen;

a computer image generator;

first visual image projector connected to said computer image generator for projecting a visual image of high-resolution (less than 4 arc minutes) onto said display screen, the displayed image sized in area to correspond to the viewable foveal area of an observer observing said display screen;

second image projector for projecting a low-resolution image onto said display screen over a wide field of view, said second image projector being fixed relative to said display screen, said second image projector connected to said computer image generator;

means for moving said high-resolution projected image about said display screen;

means for tracking the head and eye movements of said observer relative to said display screen and connected to said first image projector so that the location of the intersection point of the eye line-of-sight of the observer on the screen is determined;

merge electronic means coupled to said computer image generator and said first and second image projector for merging said high-resolution image over said low-resolution image in correspondence to the location of the high-resolution foveal sized image so that the high-resolution image and the low-resolution image can be optically blended in uniformity and appearance such that the observer does not perceive distinctions between the high and low-resolution images;

means for moving the high-resolution foveal image into registration with the intersection point of the eye line-of-sight of said observer on said display screen such that the high-resolution image will be continually positioned and displayed about the eye line-of-sight contact point of the observer on the display screen; and

means for changing the image of high resolution in the foveal area in accordance with changes in the observer'"'"'s eye line-of-sight contact point on the display screen such that the high-resolution image, when changed from one location to another by movement of the observer'"'"'s eye line-of-sight, is changed faster than the saccadic suppression of the observer when moving the eye line-of-sight between points such that the observer cannot detect transition of the high-resolution image from one location to the other.