Video conference system and method of providing parallax correction and a sense of presence

• US 5,500,671 A
• Filed: 10/25/1994
• Issued: 03/19/1996
• Est. Priority Date: 10/25/1994
• Status: Expired due to Term

• Current Assignee: AT&T IPM Corp. (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Chen, Tsuhan, Haskell, Barin G., Andersson, Russell L.
• Primary Examiner(s): Chan, Wing F.
• Application Number:
  US08/328,640
• Time in Patent Office: 511 Days
• Field of Search: 348/15-20
• US Class Current: 348/14.1
• 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
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A video conference system provides eye contact and a sense of presence to a plurality of conference participants located in respective remotely-sited conference rooms. Each conference room contains at least one video telephone or communications device that includes a video camera for generating video signals indicative of a sequence of local conferee image frames, and an image receiver for displaying image frames of at least one remote conferee. The image receiver, the video camera, and the eyes of the local conferee define a parallax angle. The video conference system further includes a frame generating system, responsive to the video signals, for analyzing local conferee image frames and generating a corresponding sequence of parallax-compensated frames. A signal indicative of each respective sequence of parallax-compensated frames is transmitted to a corresponding image receiver, whereby apparent eye contact is provided between each local conferee and a displayed image of a corresponding remote conferee. Where more than three conferees are involved, each input image frame is additionally analyzed for head position and the head position is reoriented by the frame generating system as necessary to provide a sense of presence.

Claims

1. A method for establishing a video conference between a plurality of remotely located conference rooms each containing at least one conferee, a video camera, and an image receiver, the image receiver, video camera, and eyes of each conferee associated therewith defining a parallax angle of said each conferee, comprising the steps of:

generating, with a first video camera, a video signal representative of a sequence of input image frames of a first conferee;

analyzing said input conferee image frames, in real time, to determine a parallax angle in each frame;

generating a corresponding sequence of parallax-compensated image frames; and

transmitting a signal indicative of said sequence of parallax-compensated image flames to an image receiver viewed by a second conferee, whereby eye contact is provided between said second conferee and a displayed image of said first conferee.

2. The method according to claim 1, wherein said analyzing step includes locating, in an image of said first conferee, a specular reflection of a fixed light source in a pupil of the first conferee.

3. The method according to claim 2, wherein said analyzing step further includes measuring a position of said specular reflection relative to the center of said pupil.

4. The method according to claim 1, wherein said generating step includes synthesizing at least a portion of each parallax-compensated image frame from an input conferee image frame.

5. The method according to claim 1, wherein a gaze direction of said first conferee is also obtained during said measuring step and wherein said generating step further includes texture mapping each input conferee image frame onto a three dimensional ellipsoid facial model and reorienting said facial model to achieve a facial orientation selected in accordance with said gaze direction.

6. A video conference system connecting a plurality of remotely located conference rooms, each room containing at least one of a plurality of conferees, comprising:

at least one video telephone in each room comprising a video camera for generating video signals indicative of a sequence of image frames of a first conferee and an image receiver for displaying image frames of at least a second conferee, said image receiver, said video camera, and eyes of said first conferee defining a parallax angle;

frame generating means, responsive to said video signals, for analyzing input image frames of said first conferee and for generating a corresponding sequence of parallax-compensated image frames of said first conferee; and

means for transmitting a signal indicative of said sequence of parallax-compensated frames to at least one remote image receiver, whereby eye contact is provided between at least said second conferee and a displayed image of said first conferee.

7. The system according to claim 6, further including a fixed light source in each room for producing a specular reflection on the eyes of the conferee in said each room.

8. The system according to claim 7, wherein said frame generating means is operative to analyze said input conferee image frames and detect a gaze direction of said first conferee.

9. The system according to claim 8, wherein said frame generating means is operative to generate a second image frame for transmission to at least a third conferee, said frame generating means being responsive to a detected gaze direction to texture map each input conferee image frame onto a three dimensional ellipsoid facial model and reorient said facial model to achieve a facial orientation selected in accordance with said detected gaze direction.

10. The system according to claim 9, wherein said transmitting means is operable to transmit a first sequence of parallax corrected image frames representative of said first conferee to an image receiver positioned proximate a second conferee and to transmit a second sequence of gaze direction-compensated image frames representative of said first conferee to an image receiver positioned proximate a third conferee, thereby providing a sense of presence between said first, second, and third conferees.