Bandwidth conserving near-end picture-in-picture videotelephony

• US 6,816,626 B1
• Filed: 04/27/2001
• Issued: 11/09/2004
• Est. Priority Date: 04/27/2001
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Fadel, Charles K.
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US09/845,007
• Time in Patent Office: 1,292 Days
• Field of Search: 382/282, 382/298, 382/300, 382/293, 345/629, 345/634, 345/660, 345/666, 345/815, 348/14.01, 348/14.07, 348/14.08, 348/14.09, 348/14.12, 348/14.14, 348/14.15, 348/565, 348/564, 348/552, 348/553
• US Class Current: 382/282
• CPC Class Codes: H04N 7/147 Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals selecting H04Q
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN

Abstract

A method, system and article of manufacturer is provided to improve the quality of service and image display in videotelephony systems by combining digital zooming techniques and picture-in-picture functionality to conserve bandwidth and enhance selected portions of the video display. A portion of the videotelephony image is selected to be zoomed and re-transmission of the videotelephony image source is limited by preventing instructions to zoom the defined portion from being transmitted to the videotelephony image source. Zooming of the defined portion is performed by using an interpolation-based digital zooming technique independent of the zooming capabilities of the videotelephony image source. The zoomed portion is then displayed in a window on a display screen. The zoomed portion can be displayed in an in-place window over the defined portion such that the zoomed portion overlaps adjacent non-zoomed portions of the videotelephony image or in a separate floating window on the display screen. The separate window can be a floating window or a fixed/docked window on the display screen. Additionally, a freeze-frame technique can be used to capture (“freeze”) the zoomed image such that re-transmission of the image source does not overwrite the zoomed image.

Claims

1. A method for conserving bandwidth in a transmission of a videotelephony image from a far-end videotelephony image source to a near-end, the method comprising:

defining a portion of the videotelephony image to be zoomed;

limiting the re-transmission of the defined portion from the videotelephony image source by preventing instructions to zoom the defined portion from being transmitted from the near-end to the videotelephony image source;

zooming the defined portion by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source; and

displaying the zoomed portion in a window on a display screen.

2. The method of claim 1 wherein the zoomed portion is displayed in an in-place window over the defined portion such that the zoomed portion overlaps adjacent non-zoomed portions of the videotelephony image.

3. The method of claim 1 wherein the zoomed portion is displayed in a separate window on the display screen.

4. The method of claim 3 wherein the separate window is a floating window on the display screen.

5. The method of claim 3 wherein the separate window is a fixed or docked window on the display screen.

6. The method of claim 1 wherein a freeze-frame technique is used to capture the zoomed image such that re-transmission of the image source does not overwrite the zoomed image.

7. An apparatus for conserving bandwidth in a transmission of a videotelephony image from a far-end videotelephony image source to a near-end, the apparatus comprising:

a network interface for receiving the transmission of the videotelephony image from the videotelephony image source; and

an image control processor coupled to the network interface, the image control processor defining a portion of the videotelephony image to be zoomed, limiting the re-transmission of the defined portion from the videotelephony image source by preventing instructions to zoom the defined portion from being transmitted from the near-end to the videotelephony image source, and zooming the defined portion by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source.

8. The apparatus of claim 7 wherein the zoomed portion is displayed in an in-place window over the defined portion such that the zoomed portion overlaps adjacent non-zoomed portions of the videotelephony image.

9. The apparatus of claim 7 wherein the zoomed portion is displayed in a separate window on a display screen.

10. The apparatus of claim 9 wherein the separate window is a floating window on a display screen.

11. The apparatus of claim 9 wherein the separate window is a fixed or docked window on a display screen.

12. The apparatus of claim 7 wherein a freeze-frame technique is used to capture the zoomed image such that re-transmission of the image source does not overwrite the zoomed image.

13. An apparatus for conserving bandwidth in a transmission of a videotelephony image from a far-end videotelephony image source to a near-end, the apparatus comprising:

a means for defining a portion of the videotelephony image to be zoomed;

a means for limiting the re-transmission of the defined portion from the videotelephony image source by preventing instructions to zoom the defined portion from being transmitted from the near-end to the videotelephony image source; and

a means for zooming the defined portion by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source.

14. A computer program product comprising:

a computer usable medium for conserving bandwidth in a transmission of a videotelephony image from a far-end videotelephony image source to a near-end;

a set of computer program instructions embodied on the computer usable medium, including instructions to;

define a portion of the videotelephony image to be zoomed;

limit the re-transmission of the defined portion from the videotelephony image source by preventing instructions to zoom the defined portion from being transmitted from the near-end to the videotelephony image source;

zoom the defined portion by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source; and

display the zoomed portion in a window on a display screen.

15. A computer data signal embodied in a carrier wave comprising a code segment for conserving bandwidth in a transmission of a videotelephony image from a far-end videotelephony image source to a near-end, including instructions to:

define a portion of the videotelephony image to be zoomed;

limit the re-transmission of the defined portion from the videotelephony image source by preventing instructions to zoom the defined portion from being transmitted from the near-end to the videotelephony image source;

zoom the defined portion by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source; and

display the zoomed portion in a window on a display screen.

16. A method for conserving bandwidth in a transmission of a videotelephony image from a far-end video image source to a near-end, the method comprising:

defining at least two portions of the videotelephony image to be zoomed;

limiting the re-transmission of the defined portions from the videotelephony image source by preventing instructions to zoom the defined portions from being transmitted from the near-end to the videotelephony image source;

zooming the defined portions by using an interpolation-based digital zooming technique at the near-end, independent of the zooming capabilities of the videotelephony image source; and

displaying each of the zoomed portions in a corresponding window on a display screen.