Watermark embedding
First Claim
1. A method of embedding a watermark in a media signal, comprising the step of adaptively controlling the embedding strength in dependence on an embedding parameter, characterized in that the method comprises the step of receiving said embedding parameter in the form of an auxiliary signal received along with the media signal.
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Accused Products
Abstract
Advanced watermark embedders use psycho visual/acoustic models to minimize perception of the embedded watermark in media contents. However, it is expensive to implement such advanced watermark embedders in consumer appliances (3) such as DVD recorders. In accordance with the invention, embedding strength parameters (JND) are calculated (13) off-line at a remote location (1) and transmitted along with the media contents to the consumer appliance (3). A relatively simple embedder (33) uses the received parameters to control the strength of the watermark (36) to be embedded. The parameters may be accommodated in the transmitted signal as payload of a fragile watermark or as user data in an encrypted MPEG stream.
38 Citations
9 Claims
- 1. A method of embedding a watermark in a media signal, comprising the step of adaptively controlling the embedding strength in dependence on an embedding parameter, characterized in that the method comprises the step of receiving said embedding parameter in the form of an auxiliary signal received along with the media signal.
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5. An arrangement for embedding a watermark in a media signal, comprising means for adaptively controlling the embedding strength in dependence on an embedding parameter, characterized in that the arrangement comprises means for deriving said embedding parameter from an auxiliary signal received along with the media signal.
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6. A method of transmitting a media signal from a remote location to a local station, characterized in that the method includes the steps of:
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computing at the remote location a watermark embedding parameter, said embedding parameter representing the strength with which a watermark is to be embedded in the media signal by the local station; and
transmitting said embedding parameter to the local station in the form of an auxiliary signal along with the media signal.
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7. An arrangement for transmitting a media signal from a remote location to a local station, characterized in that the arrangement comprises:
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means for computing at the remote location a watermark embedding parameter, said embedding parameter representing the strength with which a watermark is to be embedded in the media signal by the local station; and
means for transmitting said embedding parameter to the local station in the form of an auxiliary signal along with the media signal.
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8. A storage medium on which a media signal and an auxiliary signal are stored, characterized in that the stored auxiliary signal represents an embedding parameter for controlling the strength of embedding a watermark in the media signal during reproduction of the media signal.
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9. A media signal including an auxiliary signal representing an embedding parameter for controlling the strength of embedding a watermark in the media signal during reproduction of the media signal.
Specification