Apparatus facilitating eye-contact video communications

• US 5,856,842 A
• Filed: 08/26/1997
• Issued: 01/05/1999
• Est. Priority Date: 08/26/1996
• Status: Expired due to Fees

• Current Assignee: Kaiser Optical Systems, Inc. (Endress+Hauser AG)
• Original Assignee: Kaiser Optical Systems
• Inventors: Tedesco, James M.
• Primary Examiner(s): Kuntz, Curtis A.
• Assistant Examiner(s): Ramakrishnaiah, Melur
• Application Number:
  US08/918,460
• Time in Patent Office: 497 Days
• Field of Search: 348/14, 348/15, 348/16, 348/17, 348/18, 348/19, 348/20, 345/156, 345/157
• US Class Current: 348/14.16
• CPC Class Codes: G02B 27/1086 operating by diffraction only
• CPC Class Codes: H04N 7/144 camera and display on the same optical axis, e.g. optically multiplexing the camera and display for eye to eye contact

Abstract

Apparatus for gathering a frontal facial image of an individual observing a display area includes a light-conductive waveguide, transferring the image from a first light-redirecting region to a second light-redirecting region to output the image. The element is supported at least partially in front of the display, such that the input region overlies the display area, and all portions of the element overlying the display area, including the input region, are sufficiently transparent so as not to substantially interfere with the individual'"'"'s observation of the display. In a preferred embodiment, at least the input region is a holographically derived optical grating, and the element is a transparent panel constructed of glass and/or plastic. In use in a communications system, the invention would preferably further include an optoelectronic image sensor disposed to receive the image from the output region, enabling the image to be transferred, for example, to a display at a remote location, which may also incorporate the invention to facilitate two-way eye-contact communications.

Claims

1. Apparatus for gathering a frontal facial image of an individual observing a display area, comprising:

a light-conductive element having a first light-redirecting region to input the image and a second light-redirecting region to output the image, the element being operative to transfer the image from the first area to the second area by way of total internal reflection,

the element being supported partially in front of the display such that the input region overlies the display area,

and wherein all portions of the element overlying the display area, including the input region, are sufficiently transparent so as not to substantially interfere with the individual'"'"'s observation of the display.

2. The apparatus of claim 1, wherein at least the input region is a holographically derived optical grating.

3. The apparatus of claim 1, further including an optoelectronic image sensor disposed to receive the image from the output region.

4. The apparatus of claim 1, wherein the light-conductive element is a transparent panel having opposing surfaces, and wherein at least the first region is an optical grating associated with a portion of one of the surfaces.

5. The apparatus of claim 1, wherein the first light-redirecting region has a perimeter which is optically feathered to provide a smooth visual transition between the first region and the surrounding panel.

6. Apparatus for gathering a frontal facial image of an individual observing a display area, comprising:

a light-conductive panel having a first section overlying the display area and a second section outside of the display area, the first and second sections incorporating first and second optical gratings, respectively, the first grating being operative to receive the image and diffract the image at an angle allowing the panel to convey the image to the second grating through total internal reflection, the second grating being operative to recover the reflected image and diffract the image out of the panel, the first section of the panel being sufficiently transparent so as not to substantially interfere with the individual'"'"'s observation of the display.

7. An eye-contact video communications system, comprising:

a display defining an optical path to a viewer;

an image sensor outside of the optical path; and

a substantially transparent waveguide having a first optical grating disposed within the optical path to receive a facially frontal image of the viewer and a second optical grating outside of the optical path coupling the image to the image sensor.

8. The eye-contact video communications system of claim 7, further including a second display, second image sensor and second substantially transparent waveguide disposed at a remote location, each image sensor being coupled to a remote display, enabling individuals viewing each display to receive an eye-contact image of the individual at the remote location.