Embedment of data in a video signal
First Claim
1. An apparatus for embedding data in a video signal having an active video portion comprising:
- means for generating a low level waveform representing a unique digital data word and 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, the low level waveform extending 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.
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Accused Products
Abstract
Data is embedded in a video signal by adding a low level wavefrom to the video signal, the low level wave form having a level below the noise level of the video signal and corresponding to the data. To detect the 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 a 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 location 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.
394 Citations
22 Claims
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1. An apparatus for embedding data in a video signal having an active video portion comprising:
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means for generating a low level waveform representing a unique digital data word and 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, the low level waveform extending 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. - View Dependent Claims (2)
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3. An apparatus for detecting data embedded in a video signal comprising:
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means for correlating the video signal with a low level waveform corresponding to a unique data word to be detected to produce a correlation coefficient; and means for outputting the unique data word when the correlation coefficient is high. - View Dependent Claims (4, 5)
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6. A system for transmitting data within a video signal having an active video portion comprising:
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means for unobtrusively embedding in the active video portion a low level waveform corresponding to a unique data word, the low level waveform having a level below the noise level of the video signal and extending 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; and means for detecting the low level waveform within the active video portion to recover the unique data word. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of embedding data in a video signal having an active video portion comprising the steps of:
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generating a low level waveform representing a unique digital data word and 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, the low level waveform extending 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 a observer. - View Dependent Claims (13)
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14. A method of detecting data embedded in a video signal comprising the steps of:
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correlating the video signal with a low level waveform corresponding to a unique data word to be detected to produce a correlation coefficient; and outputting the unique data word when the correlation coefficient is high. - View Dependent Claims (15, 16)
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17. A method of transmitting data within an active portion of a video signal comprising the steps of:
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unobtrusively embedding in the active portion a low level waveform corresponding to a unique data word, the low level waveform having a level below the noise level of the video signal and extending 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; and detecting the low level waveform within the active portion to recover the unique data word. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification