Technique for transmitting digital data together with a video signal
First Claim
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1. Apparatus for transmitting digital data together with a sampled video signal comprising:
- means (109) for predicting the value of each of a first set of samples of said video signal based upon the value of other ones of said video signal samples;
means (110) for computing the prediction error between the value of each sample in said first set and the corresponding predicted value thereof;
means (111) for compressing said error to a range narrower than the range of said video signal;
means (112,
115) for superimposing a value indicative of said digital data on each of said compressed errors, whereby the composite value uniquely indicates the digital data; and
means (118) for time multiplexing said composite values with the values of said other ones of said video samples.
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Abstract
Supplementary digital data is encoded together with a video signal by predicting the intensity values of a first set of video samples, compressing the range of the prediction errors and superimposing a value indicative of the supplementary data on the compressed value. The samples in the first set may be selected in a regular sequence or asynchronously in accordance with a function of the video signal such as the slope in the area of the picture being processed; the composite values are time multiplexed with the remaining intensity values.
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Citations
15 Claims
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1. Apparatus for transmitting digital data together with a sampled video signal comprising:
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means (109) for predicting the value of each of a first set of samples of said video signal based upon the value of other ones of said video signal samples; means (110) for computing the prediction error between the value of each sample in said first set and the corresponding predicted value thereof; means (111) for compressing said error to a range narrower than the range of said video signal; means (112,
115) for superimposing a value indicative of said digital data on each of said compressed errors, whereby the composite value uniquely indicates the digital data; andmeans (118) for time multiplexing said composite values with the values of said other ones of said video samples. - View Dependent Claims (2, 3, 4, 5)
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6. A method of transmitting digital data together with a sampled video signal comprising the steps of:
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predicting the value of each of a first set of samples of said video signal based upon the value of other ones of said video signal samples; computing the prediction error between the value of each sample in said first set and the corresponding predicted value thereof; compressing said error to a range narrower than the range of said video signal; superimposing a value indicative of said digital data on each of said compressed errors, whereby the composite value uniquely indicates the digital data; and time multiplexing said composite values with the values of said other ones of said video samples. - View Dependent Claims (7, 8, 9, 10)
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11. Apparatus for encoding a supplementary data signal together with a video signal which represents the intensity values of a plurality of elements of a picture, comprising:
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means for forming predictions of the intensity values of a first series of picture elements based upon the intensity values of surrounding elements; means for determining the error between each of said intensity values in said first series and the corresponding prediction; means for compressing the error for each prediction in accordance with a predefined transformation characteristic; means for superimposing a value uniquely identifying a bit of said supplementary data on each compressed error; and means for multiplexing the superimposed values with the intensity values of remaining ones of said picture elements. - View Dependent Claims (12, 13, 14, 15)
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Specification