Method for signal adjustment through latency control

• US 8,305,914 B2
• Filed: 04/30/2007
• Issued: 11/06/2012
• Est. Priority Date: 04/30/2007
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Thielman, Jeffrey, Gorzynski, Mark
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): CATTUNGAL, AJAY P
• Application Number:
  US11/799,265
• Publication Number:
  US 20080267069A1
• Time in Patent Office: 2,017 Days
• Field of Search: 348/14.12, 348/14.13, 348/14.01, 370/235, 370/231, 370/252, 370/260, 370/516
• US Class Current: 370/252
• CPC Class Codes: H04N 7/142 Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN
• CPC Class Codes: H04N 7/15 Conference systems

Abstract

A method for adjusting latency in a video conference signal originating from a video conference camera and encoder is described herein. Latency in a video conference connection between more than two video conference sites is measured. The latency between each of the more than two video conference sites is compared with a latency threshold. Parameters of the video conference camera and encoder associated with each video conference site are adjusted by a video controller to modify the image quality of the video signal if the measured latency of a respective video conference connection is below the threshold.

Claims

1. A method comprising:

a) measuring latency in video conference connections between more than two video conference sites participating in a video conference;

b) comparing the measured latency for each connection to a latency threshold;

c) based on results of comparing the measured latency for each connection to the threshold, determining, for each of at least two particular ones of the connections, that the measured latency is below the threshold, where each of the particular connections enables transmission of a video signal from an associated video conference camera and encoder at one of the video conference sites to another one of the video conference sites; and

d) for each of the particular connections, adjusting, using a video controller, parameters of the associated video conference camera and encoder to increase a resolution of the video signal while maintaining bandwidth consumed by transferring the video signal at or below the bandwidth consumed by transferring the video signal prior to adjusting the parameters to increase the resolution as a consequence of having determined that the measured latency of the connection is below the threshold.

2. The method in accordance with claim 1, wherein adjusting parameters of the associated video conference camera and encoder to increase the resolution of the video signal comprises adjusting the resolution of the video signal from standard definition (SD) to high definition (HD).

3. The method in accordance with claim 1, wherein adjusting parameters of the associated video conference camera and encoder comprises applying an optimization algorithm to modify settings of the encoder to obtain a best possible video signal at a desired latency level that is below the threshold.

4. A method comprising:

a) establishing a latency budget, the latency budget defining a latency threshold for video conference connections connecting more than two video conference locations participating in a videoconference;

b) measuring latency in each video conference connection;

c) comparing each latency measurement with the latency threshold;

d) based on results of comparing each latency measurement with the latency threshold, determining that the measured latency in each of at least two particular ones of the connections is below the threshold, each of the particular connections enabling transmission of a video signal from an associated video conference camera and encoder system at one of the video conference locations to another one of the video conference locations; and

e) for each of the particular connections, as a consequence of having determined that the measured latency in the connection is below the threshold, initiating additional image processing to the video signal to improve image quality of the video signal while maintaining a bandwidth consumed by transferring the video signal at or below the bandwidth consumed by transferring the video signal prior to initiating the additional image processing to the video signal to improve the image quality of the video signal.

5. The method in accordance with claim 4, wherein establishing the latency budget comprises programming the video conference camera and encoder system with a single maximum latency level that is considered acceptable.

6. The method in accordance with claim 4, wherein establishing the latency budget comprises programming the video conference camera and encoder system with multiple selectable latency levels.

7. The method in accordance with claim 4, wherein initiating additional image processing to the video signal includes initiating application of an image-smoothing algorithm to the video signal.

8. The method of claim 4 wherein initiating additional image processing to the video signal to improve image quality of the video signal as a consequence of having determined that the measured latency in the connection is below the threshold includes initiating additional image processing to the video signal prior to encoding the video signal to improve image quality of the video signal.

9. A computer-implemented method comprising:

accessing an indication of an acceptable latency level for a network connection for a video conference;

accessing an indication of latency in a network connection that connects a first video conference endpoint and a second video conference endpoint during a video conference and that enables a transfer of a video signal from the first video conference endpoint to the second video conference endpoint during the video conference;

accessing an indication of current bandwidth consumed by transferring the video signal;

comparing, using a processing element, the latency in the network connection to the acceptable latency level;

based on results of comparing the latency in the network connection to the acceptable latency level, determining, using a processing element, that the latency in the network connection is less than the acceptable latency level; and

as a consequence of having determined that the latency in the network connection is less than the acceptable latency level, increasing a resolution of the video signal while maintaining the bandwidth consumed by transferring the video signal with increased resolution at or below the current bandwidth.

10. A computer-implemented method comprising:

accessing an indication of an acceptable latency level for a network connection for a video conference;

accessing an indication of latency in a network connection that connects a first video conference endpoint and a second video conference endpoint during a video conference and that enables a transfer of a video signal from the first video conference endpoint to the second video conference endpoint during the video conference;

comparing, using a processing element, the latency in the network connection to the acceptable latency level;

based on results of comparing the latency in the network connection to the acceptable latency level, determining, using a processing element, that the latency in the network connection is less than the acceptable latency level; and

as a consequence of having determined that the latency in the network connection is less than the acceptable latency level, applying additional image processing to the video signal prior to encoding the video signal for transmission from the first video conference endpoint to the second video conference endpoint while maintaining a bandwidth consumed by transferring the video signal at or below the bandwidth consumed by transferring the video signal prior to applying the additional image processing to the video signal.

11. The method of claim 10 further comprising increasing the camera frame rate as a consequence of having determined that the latency in the network connection is less than the acceptable latency level.

12. The method of claim 10 further comprising adjusting a video scanning mode as a consequence of having determined that the latency in the network connection is less than the acceptable latency level.

13. The method of claim 12 wherein adjusting the video scanning mode includes switching from an interlaced video scanning mode to a progressive video scanning mode.

14. The method of claim 10 wherein applying additional image processing to the video signal prior to encoding the video signal for transmission from the first video conference endpoint to the second video conference endpoint as a consequence of having determined that the latency in the network connection is less than the acceptable latency level includes applying an image smoothing algorithm to the video signal prior to encoding the video signal for transmission from the first video conference endpoint to the second videoconference endpoint.