Embedment of data in a video signal

Details Embedment of data in a video signal Embedment of data in a video signal

1988-09-23

1990-11-06

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358146, H04N 708

Patent

active

049690418

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.

REFERENCES:
patent: 3838444 (1974-09-01), Loughlin et al.
patent: 3984624 (1976-10-01), Waggener
Tech. Hochschule Aachen; "Additive Binary Data Transmission in Video Signals"; by Szepanski, NTG-Fachber (Germany), vol. 74, 1980, pp. 343-351.

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