Composite image display device and service for video conferencing

• US 6,075,571 A
• Filed: 07/29/1997
• Issued: 06/13/2000
• Est. Priority Date: 07/29/1997
• Status: Expired due to Term

• Current Assignee: Nokia of America Corporation (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Stuntebeck, Peter H., Pemmaraju, Ramarao, Kuthyar, Ashok K., Mamamurthy, Ram S.
• Primary Examiner(s): HSIA, SHERRIE Y
• Application Number:
  US08/915,506
• Time in Patent Office: 1,050 Days
• Field of Search: 348/584, 348/588, 348/598, 348/599, 348/15, 348/16, 348/20, 348/385, 348/13, 348/17, 348/14, 348/563, 348/564
• US Class Current: 348/584
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A network-based device creates composite video streams containing video images of users for display on video conferencing screens. Video image streams are cascaded through a series of quad boxes to create combined video streams and ultimately the composite video stream. The composite video stream produces a display grid comprised of a plurality of image boxes. The device uses quad box input port mapping to direct a specific video image stream to a specific image box by controlling the cascade path of each video image stream through the quad boxes in creating the composite video stream. A user interface permits a user to selectively determine the layout of user images on the video conferencing screen. Screen layout extends to size of each user image being incrementally controlled and location of each user image being selectively determined depending upon the size and the number of the various user images. By controlling size and location of each user image, the screen display area available for other uses, such as the display of applications programs, is increased.

Claims

1. A multi-image video composition device resident in a network serving a plurality of user video conferencing stations each having a video screen having screen area, said composition device receiving at least one specific video image stream in analog form, moderating said specific video image stream into a composite image stream in analog form and delivering said composite image stream into the network such that the composite image stream creates an image grid having more than four grid boxes and such that an at least one specific video image carried by the at least one specific video image stream is displayed in a specific one of the more than four grid boxes on a specific user'"'"'s conferencing station screen, said composition device comprised of:

at least two serially ganged quad boxes, each having four input ports and an output port; and

means for selectively directing the at least one specific video image stream along a path through a specific one of said four input ports of each of the at least two serially ganged quad boxes, to create the composite image stream.

2. The video composition device of claim 1 wherein the serially ganged quad boxes create the image grid and control the number of grid boxes.

3. The video composition device of claim 2, wherein the specific grid box in which the at least one specific video image is displayed is determined by the combination of the specific one of said four input ports of each of the at least two serially ganged quad boxes included in the path.

4. The video composition device of claim 3, in which the selectively directing means can controllably alter said path of the at least one specific video image stream to determine a new path through another specific one of said four input ports of each of the at least two serially ganged quad boxes,

whereby the at least one specific video image ceases to be displayed in the specific grid box but is instead displayed in a different grid box.

5. The video composition device of claim 4, in which the selectively directing means uses port mapping to determine and controllably alter the path of the at least one specific video image stream.

6. The video composition device of claim 5, also including means for Chroma Keying to turn off the grid boxes other than the boxes in which the at least one specific video image is displayed,

whereby the screen area to which the turned off grid boxes would otherwise display is available for display of other video images.

7. The video composition device of claim 6, also comprised of:

means for a user to select a specific grid box in which the at least one specific video image is to be displayed;

means for communicating the user'"'"'s selection to the directing means; and

the directing means including means for determining from the user'"'"'s selection the number of quad boxes serially ganged and the specific input port on each of serially ganged quad boxes along the path for the at least one specific video image stream to cause the at least one specific video image to be displayed in the specific grid box selected by the user.

8. In a video conferencing system including a display screen, a video image composition device comprised of:

a plurality of quad boxes ganged serially, each quad box having four input ports; and

means for directing an analog video stream carrying a video image sequentially along a selectably determined path through said plurality of quad boxes, said path being to a specific one of the said four input ports on each of the plurality of serially ganged quad boxes,

whereby the analog video stream becomes part of a composite analog video stream created by the serially ganged quad boxes and the composite analog video stream causes the display screen to display a grid comprised of a plurality of image boxes and the video image appears in a specific one of the plurality of image boxes.

9. The video image composition device of claim 8, wherein the directing means is comprised of:

a port mapping table, each table entry determining a specific image box in which the video image will display by defining the sequence of input ports and the sequence of quad boxes as the path of the analog video stream;

means for selecting a specific table entry;

means for constructing the path consistent with the selected port mapping table entry.

10. The video image composition device of claim 9, including a user interface comprised of:

means for identifying the number of image boxes in the plurality of image boxes and the location of each image box in the grid;

means for selecting a specific image box for display of the video image;

means for communicating to the directing means the specific image box selected.

11. The video image composition device of claim 10, wherein the user interface is further comprised of means for changing the image box selection.

12. The video image composition device of claim 11, including means for delivering the composite analog video stream to a specific screen.

13. An analog image composition device for composing a plurality of video images of users in a video conference such that each video image appears at a determined location on a user'"'"'s video screen, comprised of:

a plurality of quad boxes ganged serially for creating a display grid comprised of more than four grid boxes on the video screen; and

means for directing a specific user video image to a specific desired grid box.

14. The image composition device of claim 13, in which the means for directing a specific user video image to a specific desired grid box includes a means for pathing the video image through the plurality of quad boxes.

15. The image composition device of claim 14, in which each quad box in the plurality of quad boxes has four input ports and said pathing means includes means for selectively determining a specific one of the four input ports of each of said plurality of quad boxes whereby the pathing of the video image is defined.

16. The image composition device of claim 14, in which said directing means includes means for selectively changing the pathing of the video image to cause said specific user video image to be directed to appear in a different specific desired grid box.

17. The image composition device of claim 16 in which the directing means is further comprised of:

a user interface which provides a user the ability to changeably select user video image size and changeably select the specific grid box in which the specific user video image is to appear; and

a composition administration device which advises the user interface of the available image sizes for screen display and the grid boxes available for video image display and causes the image composition device to adjust the pathing for said specific user video image based on selections made by the user.

18. The image composition device of claim 17, resident in a communication network supporting the video conference.