Retinally stabilized differential resolution television display

• US 4,513,317 A
• Filed: 09/28/1982
• Issued: 04/23/1985
• Est. Priority Date: 09/28/1982
• Status: Expired due to Fees

• Current Assignee: NOVO Industri A/S City of Bagsvaerd
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Ruoff, Carl F. Jr.
• Primary Examiner(s): Masinick, Michael A.
• Assistant Examiner(s): Coles, Edward L.
• Application Number:
  US06/425,204
• Time in Patent Office: 938 Days
• Field of Search: 358/109, 358/133, 358/93, 358/108, 358/137, 358/138, 358/166, 358/180
• US Class Current: 375/240.25
• CPC Class Codes: H04N 7/005 using at least one opto-electrical conversion device
• CPC Class Codes: H04N 7/12 Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal H04N7/24 takes precedence

Abstract

A remote television viewing system employing an eye tracker is disclosed, wherein a small region of the image appears in high resolution, and the remainder of the image appears in low resolution. The eye tracker monitors the position of the viewer'"'"'s line of sight. The eye tracker position data is transmitted to the remote television camera and control. Both the remote camera and television display are adapted to have selectable high-resolution and low-resolution raster scan modes. The position data from the eye tracker is used to determine the point at which the high-resolution scan is to commence. The video data defining the observed image is encoded in a novel format, wherein in each data field, the data representing the position of the high-resolution region of predetermined size appears first, followed by the high-resolution zone video data and then the low-resolution region data. As the viewer'"'"'s line of sight relative to the displayed image changes, the position of the high-resolution region changes to track the viewer'"'"'s line of sight.

Claims

1. A differential resolution television apparatus for displaying images of a remote site comprising:

a raster-scanned CRT display means having a viewing screen for displaying said images, said display means adapted for selectable raster scan operation at a first resolution level and at a second resolution level;

eye tracking means for sensing the line of sight of an observer'"'"'s eye relative to the viewing screen and generating first position signals indicative of the position of the observer'"'"'s line of sight relative to the viewing screen;

video camera means adapted for selectable raster scan sampling at said first resolution level and at said second resolution level such that a first region of the image is sampled at said first resolution level and the remainder of said image is sampled at said second resolution level;

camera control means for controlling the resolution level of said camera means and the location of said first region in dependence upon said position signals from said eye tracking means;

means for transmitting video data generated by said camera means to said CRT display means, said CRT display means being further adapted to display said image at said first resolution level within said first region and at said second resolution level for the remainder of said image; and

wherein said first resolution level is obtained by selecting a fine CRT beam and using the same raster line scan interval to scan a line in said first region as to scan a line at said second resolution level.

2. The apparatus of claim 1 wherein said second resolution level is obtained by selecting a coarse CRT beam.

3. The apparatus of claim 1 wherein said third set of data includes data representative of the entire image at said second resolution level, and further includes blanking signals indicating blanking of said CRT beam when passing within said first region.

4. A differential resolution television apparatus for displaying images of a remote site comprising:

a raster-scanned CRT display means having a viewing screen for displaying said images, said display means adapted for selectable raster scan operation at a first resolution level and at a second resolution level;

eye tracking means for sensing the line of sight of an observer'"'"'s eye relative to the viewing screen and generating first position signals indicative of the position of the observer'"'"'s line of sight relative to the viewing screen;

video camera means adapted for selectable raster scan sampling at said first resolution level and at said second resolution level such that a first region of the image of predetermined size is sampled at said first resolution level and the remainder of said image is sampled at said second resolution level;

camera control means for controlling the resolution level of said camera means and the location of said first region in dependence upon said position signals from said eye tracking means, said camera control means including means for encoding video data generated by said camera means in a format wherein each field of a frame includes a first set of data representing the position of said first portion of said image, and second and third sets of data representative, respectively, of said first region of said image, and the remainder of said image, said first set of data including data representative of the position of the upper left-hand corner of said first region relative to said display; and

means for transmitting video data generated by said camera means to said CRT display means, said CRT display means being further adapted to display said image at said first resolution level within said first region and at said second resolution level for the remainder of said image.

5. The apparatus of claim 4 wherein said display means further includes receiver means for receiving said transmitted data from said transmitting means.

6. The apparatus of claim 5 wherein said display means further comprises decoder means coupled to said receiver means and adapted to decode said first set of data to recover second position signals representing the position of said first region.

7. The apparatus of claim 6 further including field region detecting means for monitoring the raster line count in each field and determining the appropriate display resolution level from said second position signals and said line count.

8. A differential resolution television apparatus for displaying images of a remote site comprising:

a raster-scanned CRT display means having a viewing screeen for displaying said images, said display means adapted for selectable raster scan operation at a first resolution level and at a second resolution level;

eye tracking means for sensing the line of sight of an observer'"'"'s eye relative to the viewing screen and generating first position signals indicative of the position of the observer'"'"'s line of sight relative to the viewing screen;

video camera means adapted for selectable raster scan sampling at said first resolution level and at said second resolution level such that a first region of the image is sampled at said first resolution level and the remainder of said image is sampled at said second resolution level;

camera control means for controlling the resolution level of said camera means and the location of said first region in dependence upon said position signals from said eye tracking means;

means for transmitting video data generated by said camera means to said CRT display means, said CRT display means being further adapted to display said image at said first resolution level within said first region and at said second resolution level for the remainder of said image;

eye position receiver means for receiving said first position signals;

first region detector means for decoding said first position signals, said means including storing means for storing said first position signals; and

field region detector means adapted to monitor the raster scan line count of said camera means and the raster line position relative to said first region.

9. The apparatus of claim 8 wherein said field region detector means is adapted to generate a camera scan beam control signal, and said apparatus further includes electron gun control means for selection of the scan beam mode.

10. The apparatus of claim 9 wherein said camera control means further includes gain control means for controlling the vertical and horizontal sweep gains in dependence upon said beam control signal.

11. The apparatus of claim 10 wherein said gain control means is adapted to set a first predetermined gain for said first resolution level, and a second predetermined gain for said second resolution level.

12. The apparatus of claim 11 further comprising means for providing bias signals to said camera means in dependence upon said first position signals.