Video teleconferencing system

• US 5,675,374 A
• Filed: 09/02/1994
• Issued: 10/07/1997
• Est. Priority Date: 11/26/1993
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kohda, Youji
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Woo, Stella
• Application Number:
  US08/299,112
• Time in Patent Office: 1,131 Days
• Field of Search: 348/15, 348/14, 348/16, 348/17, 348/18, 348/19, 348/20, 379/96, 379/202, 379/203, 379/204, 379/205, 379/206, 379/53, 379/54
• US Class Current: 348/14.1
• CPC Class Codes: H04N 7/15 Conference systems
• CPC Class Codes: H04N 7/152 Multipoint control units therefor

Abstract

A video teleconferencing system is adapted to make a video conference among a plurality of participants located at different work locations. The video teleconferencing system includes a plurality of image pickup devices provided at each work location for picking up the participant at each work location, a plurality of image displays provided at each work location for displaying images of the participants, an image converter provided for each work location for converting the image picked up by the image pickup means into a mirror image thereof, and an image selector provided for each work location for selecting the image to be transmitted to the image displays at every work location from the images picked up by the image pickup devices and the mirror images thereof obtained from the image converter.

Claims

1. A video teleconferencing system providing a video teleconference among plural participants having corresponding faces and located at respective, plural different work locations, the video teleconferencing system comprising:

at each work location, a respective image pick-up and processing unit having left and right image pick-up elements positioned at symmetrically displaced, oblique viewing angles to the left and right of a frontal view of the face of the respective participant and producing corresponding left and right picked-up images of the face of the participant and, further, processing the left and right picked-up images to produce, without conversion, corresponding left and right direct image outputs and, with conversion, corresponding left and right mirror image outputs;

at each work location, a respective image display unit having left and right image display elements selectively providing left and right image displays of an individual participant, relative to and for viewing by the respective participant;

at each work location, a respective image specifying unit specifying image outputs to be selected for display, selectively and respectively, on the left and right image display elements of the respective image display unit and in common for the image display units respectively associated with the plurality of work locations, and in accordance with selected, specific participants whose corresponding images are to be displayed, out of the plural participants of the video teleconferencing system, and in accordance with selectively displaying;

i. the corresponding image of the specific participant, as picked-up by the left image pick-up element, on the right display element and the corresponding mirror image thereof for display on the left display element, and

ii. the corresponding image of the specific participant, as picked-up by the right image pick-up element, on the left display element and the corresponding mirror image thereof for display on the right display element; and

a determination and selection unit determining the specific participants whose corresponding images are to be displayed on a respective one of the left and right image display elements, in common for the plural image display units on which the corresponding images of the respective, specific participants are to be displayed, the image specifying units correspondingly specifying the image outputs to be selected and displayed and the determination and selection unit, further, selecting and supplying the specified image outputs to the respective left and right image display elements of each image display unit of the plural different work locations for viewing by the respective, plural participants.

2. The video teleconferencing system as claimed in claim 1, wherein each of said image pickup elements comprises a video camera.

3. The video teleconferencing system as claimed in claim 1, wherein each of said image display units comprises a plurality of display elements respectively displaying corresponding images of a plurality of individual participants and which are arranged in a mutual, line symmetrical plane arrangement or in a plane symmetrical three-dimensional arrangement.

4. The video teleconferencing system as claimed in claim 3, wherein each of said plurality of display elements comprises a plurality of sections of a window of a display screen.

5. The video teleconferencing system as claimed in claim 1, wherein:

M image display units are provided at each of N work locations, where N>

2 and 2<

M<

N, and said video teleconferencing system; and

an image determination unit is provided for each of the N work locations, for determining the images to be displayed on said M image display units provided in one of the N work locations from the images received from said N work locations.

6. The video teleconferencing system as claimed in claim 5, wherein said image determination unit determines, as the images to be distributed to each of said N work locations, images received from M work locations at each of which a speech is newly made.

7. The video teleconferencing system as claimed in claim 1, which further comprises:

at least one voice collecting unit, provided at each work location;

an acoustic image reproducing unit, provided at each work location, reproducing sound at a plurality of positions at each work location; and

an acoustic image synthesizer, provided at each work location, synthesizing acoustic images, including sound collected at each of the work locations, and outputting synthesized acoustic images to said acoustic image reproducing unit provided at each of the work locations so that a voice of a specific participant displayed on a left image display is synthesized such that the voice is heard from the left, due to acoustic image orientation, and a voice of a specific participant displayed on a right image display is synthesized such that the voice is heard from the right, due to the acoustic image orientation.

8. The video teleconferencing system as claimed in claim 1, wherein each said image pickup and processing unit, as provided in a respective work location, comprises at least a pair of video cameras, each said image display unit provided in one work location comprises at least a pair of display elements, and a pair of units respectively and integrally comprises a corresponding one of the pair of video cameras and a corresponding one of the pair of display elements, wherein the video camera and the display element within the unit are oriented, so as to face in generally the same direction.

9. The video teleconferencing system as claimed in claim 8, wherein each image display unit, as provided in a respective work location, further comprises a display screen which is independent of the display parts, and said image displays are provided on both sides of the display screen, so that the display screen faces immediately in front of the respective participant and the plural units face the certain participant at an angular displacement from the front of the certain participant.

10. A video teleconferencing system providing video teleconferences between plural participants located at respective, plural different work locations, the video teleconferencing system comprising:

plural image pick-up and processing units respectively associated with the plural different work locations, each image pick-up and processing unit at a respective work location being disposed, relatively to the respective participant thereat, for picking up left and right symmetrically angularly separated images of the respective participant and processing same to produce, without conversion, corresponding left and right direct image outputs and to produce, with conversion, corresponding left and right mirror image outputs;

plural image display units respectively associated with the plural different work locations, each image display unit having left and right display elements disposed relatively to the respective participant for providing left and right, symmetrically angularly separated image displays relatively to, and for viewing by, the respective participant;

an image specifying unit specifying, in common for each of the plural image pick-up and processing units, the image output thereof to be supplied to the plural image display units for producing an image display of the respective participant in accordance with which of the left and right symmetrically angularly separated images of the respective participant, as picked-up, is selected for display and which of the left and right image display elements is selected for providing the selected image output display; and

a unit determining, from the plurality of participants, specific participants whose corresponding respective images are to be displayed at respective display elements, in common at the plural image display units respectively associated with the plural different work locations, and, further, selecting for each specific participant and in common for each of the plural image display units a respective one of the left and right display elements for display of the image of the specific participant, and supplying, in common to the plural display units for display by the respective, selected display elements, the specified ones of the left and right direct and mirror image outputs, thereby to produce displays, in common, of the corresponding images of the specific participants at the plural work locations.

11. A video teleconferencing system as recited in claim 10, wherein the determining unit determines first and second specific participants in accordance with the number of participants who are currently speaking, and wherein:

(a) if the number is 0, determines same to be the two participants who were most recently speaking;

(b) if the number is 1, determines, as the second specific participant, a participant who was most recently speaking;

(c) if the number is 2, determines the two participants who are currently speaking as the two specific participants; and

(d) if the number is 3 or greater, determines the two most recently speaking participants as the first and second specific participants.

12. A video teleconferencing system as recited in claim 10 wherein the determining unit determines the specific participants based on respective activity levels of the plural participants during a selected time interval related to a currently provided image display thereof.

13. A video teleconferencing system as recited in claim 12 wherein the activity levels comprise the respective levels of speaking activities of the plural participants.

14. A video teleconferencing system as recited in claim 12, wherein the determining unit determines first and second specific participants and selects, for an image picked-up from the left of the first specific participant, the corresponding left mirror image output for providing a left image display, of the first participant, in common by each of the plural image display units and, for an image picked-up from the right of the second specific participant, the corresponding right mirror image output for providing a right image display, in common, by each of the plural image display units.

15. A video teleconferencing system as recited in claim 14, wherein the determining unit, when selecting first and second remote participants as the first and second specific participants, selects a left image output of one and a right image output of the other of the first and second remote, specific participants thereby to provide, in common at the plural image display units, left and right image outputs of the first and second remote participants, providing respective images thereof having the appearance of facing each other and thereby each conferring with the other.

16. A video teleconferencing system as recited in claim 12 wherein the determining unit determines first and second specific participants and selects, for an image picked up from the left of the first participant, the corresponding left direct image output for providing a right image display of the first participant, in common, by each of the plural image display units and, for an image picked-up from the right of the second specific participant, the corresponding left direct image output for providing a left image display, in common, by each of the plural image display units.

17. A video teleconferencing system as recited in claim 12, wherein each of the plural different work locations is a remote work location, relative to each other work location of the plural different work locations, and a local work location, relative to the respective participant located thereat, and the respective participants at the local and remote work locations correspondingly being local and remote participants.

18. A video teleconferencing system as recited in claim 17, wherein the determining unit, when determining a local participant as the specific participant, selects one of the left and right mirror image outputs of the local participant as the common image display of that local specific participant at the respective local image display unit and at all remote image display units.