Publication NumberUS 20100026813
Assignees
  • K-WILL Corporation
  • The University of Southern California
Filing StatusPatent Application
US PAIR StatusAbandoned -- Failure to Respond to an Office Action
US PAIR Status Date2012-09-10
Application Number12/221285
AvailabilityUnknown
Filing Date2008-07-31
Publication Date2010-02-04

Abstract

A first video characteristic value is determined from a video/audio signal. The first video characteristic value is embedded in an audio portion of the video/audio signal and the video/audio signal is transmitted from a transmission source to a transmission destination. At the destination, the first video characteristic value is recovered and the received video/audio signal is used to determine a second video characteristic value. The recovered first video characteristic value is used to verify or check the second video characteristic value. By comparing the first and second video characteristic values, a determination is made about degradation of the received video/audio signal. In one example, a determination is made as to whether a lip-sync error has likely occurred. In another example, the audio-transmitted first video characteristic is used for copyright protection purposes.

Claims

  • 1. A monitoring method for monitoring a video and audio signal transmitted from a transmission source to a transmission destination, the method comprising: (a) determining a first video characteristic from the video and audio signal before the transmission; (b) transmitting the first video characteristic to the transmission destination by embedding the first video characteristic in an audio portion of the video and audio signal; (c) receiving the video and audio signal at the transmission destination and recovering the first video characteristic from the video and audio signal; (d) determining a second video characteristic from the video and audio signal after the transmission; and (e) using the first video characteristic and the second video characteristic to make a video quality determination.
  • 2. The monitoring method of claim 1, wherein (e) involves determining whether an error occurred based at least in part on a difference between the first and second video characteristics.
  • 3. The monitoring method of claim 2, further comprising: (f) correcting the video and audio signal in response to the determination in (e) of whether the error occurred.
  • 4. The monitoring method of claim 1, wherein the first video characteristic is a block variance of a difference between two video frames.
  • 5. The monitoring method of claim 4, wherein the first video characteristic remains the same for all subsequent frames until the block variance of the difference between two video frames exceeds a predetermined amount.
  • 6. The monitoring method of claim 1, wherein the first video characteristic is of a type not subject to damage by file compression.
  • 7. The monitoring method of claim 1, wherein the first video characteristic is embedded into the audio portion using a Quantization Index Modulation method.
  • 8. The monitoring method of claim 1, wherein the first video characteristic is embedded into the audio portion using a Spread Transform Dither Modulation method.
  • 9. The monitoring method of claim 1, wherein the first video characteristic is of a type not subject to damage by format conversion.
  • 10. The monitoring method of claim 1, wherein the same algorithm is used to determine the second video characteristic from the received video and audio signal in (d) as was used to determine the first video characteristic from the original video and audio signal in (a).
  • 11. A method comprising: (a) determining a first video characteristic from a video and audio signal; (b) embedding the first video characteristic in an audio-portion of the video and audio signal; and (c) transmitting the video and audio signal after the embedding of (b).
  • 12. A method comprising: (a) receiving a video and audio signal and extracting from an audio portion of the video and audio signal a first video characteristic; (d) determining a second video characteristic from the video and audio signal after the receiving of (a); and (e) using the first video characteristic and the second video characteristic to make a video quality determination.
  • 13. A monitoring method for monitoring a video and audio signal transmitted from a transmission source to a transmission destination, the method comprising: (a) creating a first characteristic value from a video portion of the video and audio signal before the transmission; (b) transmitting the first characteristic value to the transmission destination by embedding the first characteristic value into an audio portion of the video and audio signal; (c) creating a second characteristic value from the video portion of the video and audio signal after the transmission; (d) examining at the transmission destination the first characteristic value to determine if it is in proper form; (e) comparing the first characteristic value and the second characteristic value; and (f) determining an error occurrence when, if the first characteristic value is in proper form, there is a difference of greater than a predetermined value between the first characteristic value and the second characteristic value.
  • 14. The monitoring method of claim 13, wherein the video and audio signal transmitted to the transmission destination is corrected in response to the determining in (f) that an error occurred.
  • 15. The monitoring method of claim 13, wherein the first characteristic value is a block variance value indicative of a difference between two video frames.
  • 16. The monitoring method of claim 15, wherein the first characteristic value remains the same for all subsequent frames until the block variance of the difference between two video frames exceeds a predetermined amount.
  • 17. An apparatus comprising: means for determining a media characteristic value from a video and audio signal, and for embedding the media characteristic value into an audio portion of the video and audio signal; and an output port through which the video and audio signal with the embedded media characteristic value is communicated.
  • 18. The apparatus of claim 17, wherein the means embeds the media characteristic value using one of a Quantization Index Modulation (QIM) method and a Spread Transform Dither Modulation (STDM) method.
  • 19. An apparatus comprising: an input port through which a video and audio signal is received, the video and audio signal having an audio portion; and means for recovering a first media characteristic value from the audio portion, for determining a second media characteristic value from a video portion of the video and audio signal, and for using the first and second media characteristic values to make a media quality determination.
  • 20. The apparatus of claim 19, wherein the means is also for determining whether a lip-sync error has likely occurred.