EP0360615A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Embedment of data in a video signal
Assignee: Grass Valley Group Inc
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Filing: 1989-09-22
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Granted: —
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Expires: 2009-09-22
Abstract
Abstract Data is embedded in a video signal by adding a low level waveform to the video signal, the low level waveform having a level below the noise level of the video signal and corresponding to the data. To detect data embedded in the video signal the video signal is correlated with the low level waveform corresponding to the data to produce a correlation coefficient. A high correlation coefficient indicates the presence of the low level waveform which is converted into the data. The low level waveform extends over many video lines such that it does not occur at or near the same position within a video frame for many video frames to avoid fixed-pattern noise anomalies that may be detected by a viewer of the television picture.
Inventors
- 👤 William J. O'grady
- 👤 Robert J. Dubner
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:20
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N7/00; H04N7/08; H04N2005/91307; H04N2005/91321; H04N2005/9135
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
50 words
An apparatus for embedding data in a video signal having an active video portion comprising: means for generating a low level waveform having a level below the noise level of the video signal; and means for combining the low level waveform with the active video portion in an unobtrusive manner.
Claim 2
Independent Claim
50 words
An apparatus for embedding data in a video signal having an active video portion comprising: means for generating a low level waveform having a level below the noise level of the video signal; and means for combining the low level waveform with the active video portion in an unobtrusive manner.
Claim 3
Dependent Claim
50 words
An apparatus as recited in claim 1 where the generating means comprises: means for storing the low level waveform; and means for addressing the storing means so that the low level waveform is read out from the storing means for input to the combining means during the active video portion.
Claim 4
Dependent Claim
57 words
An apparatus as recited in claim 1 wherein the low level waveform extends over a plurality of video lines of the video signal in such a manner that it does not occur at or near the same position of a video frame for many video frames to avoid a fixed-pattern anomaly that is detectable by an observer.
Claim 5
Independent Claim
47 words
An apparatus for detecting data embedded in a video signal comprising: means for correlating the video signal with a low level waveform corresponding to the data to be detected to produce a correlation coefficient; and means for outputting the detected data when the correlation coefficient is high.
Claim 6
Independent Claim
47 words
An apparatus for detecting data embedded in a video signal comprising: means for correlating the video signal with a low level waveform corresponding to the data to be detected to produce a correlation coefficient; and means for outputting the detected data when the correlation coefficient is high.
Claim 7
Dependent Claim
45 words
An apparatus as recited in claim 4 wherein the correlating means comprises: means for multiplying the video signal with the low level waveform; and means for integrating the resulting product from the multiplying means over a specified period of time to produce the correlation coefficient.
Claim 8
Dependent Claim
56 words
An apparatus as recited in claim 4 wherein the outputting means comprises: means for comparing the correlation coefficient with a threshold value so that when the correlation coefficient exceeds the threshold value the data corresponding to the low level waveform is detected; and means for converting the output of the comparing means to the detected data.
Claim 9
Independent Claim
64 words
A system for transmitting data within a video signal having an active video portion comprising: means for unobtrusively embedding in the active video portion a low level waveform corresponding to the data, the low level waveform having a level below the noise level of the video signal; and means for detecting the low level waveform within the active video portion to recover the data.
Claim 10
Independent Claim
64 words
A system for transmitting data within a video signal having an active video portion comprising: means for unobtrusively embedding in the active video portion a low level waveform corresponding to the data, the low level waveform having a level below the noise level of the video signal; and means for detecting the low level waveform within the active video portion to recover the data.
Claim 11
Dependent Claim
36 words
A system as recited in claim 7 wherein the embedding means comprises: means for generating the low level waveform; and means for combining the low level waveform with the active video portion in an unobtrusive manner.
Claim 12
Dependent Claim
50 words
A system as recited in claim 8 wherein the generating means comprises: means for storing the low level waveform; and means for addressing the storing means so that the low level waveform is read out from the storing means for input to the combining means during the active video portion.
Claim 13
Dependent Claim
58 words
A system as recited in claim 8 wherein the low level waveform extends over a plurality of video lines of the video signal in such a manner that it does not occur at or near the same position of a video frame for many video frames to avoid a fixed-pattern anomaly that may be detected by an observer.
Claim 14
Dependent Claim
48 words
A system as recited in claim 7 wherein the detecting means comprises: means for correlating the video signal with the low level waveform corresponding to the data to be detected to produce a correlation coefficient; and means for outputting the detected data when the correlation coefficient is high.
Claim 15
Dependent Claim
45 words
A system as recited in claim 11 wherein the correlating means comprises: means for multiplying the video signal with the low level waveform; and means for integrating the resulting product from the multiplying means over a specified period of time to produce the correlation coefficient.
Claim 16
Dependent Claim
56 words
A system as recited in claim 11 wherein the outputting means comprises: means for comparing the correlation coefficient with a threshold value so that when the correlation coefficient exceeds the threshold value the data corresponding to the low level waveform is detected; and means for converting the output of the comparing means to the detected data.
Claim 17
Independent Claim
49 words
A method of embedding data in a video signal having an active video portion comprising the steps of: generating a low level waveform having a level below the noise level of the video signal; and combining the low level waveform with the active video portion in an unobtrusive manner.
Claim 18
Independent Claim
49 words
A method of embedding data in a video signal having an active video portion comprising the steps of: generating a low level waveform having a level below the noise level of the video signal; and combining the low level waveform with the active video portion in an unobtrusive manner.
Claim 19
Dependent Claim
47 words
A method as recited in claim 14 where the generating step comprises the steps of: storing the low level waveform; and addressing the stored low level waveform so that the low level waveform is read out for input to the combining step during the active video portion.
Claim 20
Dependent Claim
58 words
A method as recited in claim 14 wherein the low level waveform extends over a plurality of video lines of the video signal in such a manner that it does not occur at or near the same position of a video frame for many video frames to avoid a fixed-pattern anomaly that may be detected by an observer.
Claim 21
Independent Claim
46 words
A method of detecting data embedded in a video signal comprising the steps of: correlating the video signal with a low level waveform corresponding to the data to be detected to produce a correlation coefficient; and outputting the detected data when the correlation coefficient is high.
Claim 22
Independent Claim
46 words
A method of detecting data embedded in a video signal comprising the steps of: correlating the video signal with a low level waveform corresponding to the data to be detected to produce a correlation coefficient; and outputting the detected data when the correlation coefficient is high.
Claim 23
Dependent Claim
44 words
A method as recited in claim 17 wherein the correlating step comprises the steps of: multiplying the video signal with the low level waveform; and integrating the resulting product from the multiplying step over a specified period of time to produce the correlation coefficient.
Claim 24
Dependent Claim
55 words
A method as recited in claim 17 wherein the outputting step comprises the steps of: comparing the correlation coefficient with a threshold value so that when the correlation coefficient exceeds the threshold value the data corresponding to the low level waveform is detected; and converting the output of the comparing step to the detected data.
Claim 25
Independent Claim
57 words
A method of transmitting data within an active portion of a video signal comprising the steps of: unobtrusively embedding in the active portion a low level waveform corresponding to the data and having a level below the noise level of the video signal; and detecting the low level waveform within the active portion to recover the data.
Claim 26
Independent Claim
57 words
A method of transmitting data within an active portion of a video signal comprising the steps of: unobtrusively embedding in the active portion a low level waveform corresponding to the data and having a level below the noise level of the video signal; and detecting the low level waveform within the active portion to recover the data.
Claim 27
Dependent Claim
34 words
A method as recited in claim 20 wherein the embedding step comprises the steps of: generating the low level waveform; and combining the low level waveform with the active portion in an unobtrusive manner.
Claim 28
Dependent Claim
46 words
A method as recited in claim 21 wherein the generating step comprises the steps of: storing the low level waveform; and addressing the stored low level waveform so that the low level waveform is read out for input to the combining step during the active portion.
Claim 29
Dependent Claim
61 words
A method as recited in claim 21 wherein the low level waveform extends over a plurality of video lines of the video signal in such a manner that it does not occur at or near the same position of a video frame for many video frames to avoid a fixed-pattern anomaly that is detectable by an observer in the television picture.
Claim 30
Dependent Claim
47 words
A method as recited in claim 20 wherein the detecting step comprises the steps of: correlating the video signal with the low level waveform corresponding to the data to be detected to produce a correlation coefficient; and outputting the detected data when the correlation coefficient is high.
Claim 31
Dependent Claim
44 words
A method as recited in claim 24 wherein the correlating step comprises the steps of: multiplying the video signal with the low level waveform; and integrating the resulting product from the multiplying step over a specified period of time to produce the correlation coefficient.
Claim 32
Dependent Claim
55 words
A method as recited in claim 24 wherein the outputting step comprises the steps of: comparing the correlation coefficient with a threshold value so that when the correlation coefficient exceeds the threshold value the data corresponding to the low level waveform is detected; and converting the output of the comparing means to the detected data.
References Cited (Backward Citations)
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