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US 5,901,178 AGranted
Post-compression hidden data transport for video
AssigneeSolana Technology Development Corporation
InventorsChong U. Lee, Kamran Moallemi, Jurg Hinderling
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AssigneeSolana Technology Development Corporation
InventorsChong U. Lee, Kamran Moallemi, Jurg Hinderling
Estimating the term…
Auxiliary data is carried substantially imperceptibly with video transform data in combined transform samples according to a visibility threshold. The auxiliary data provides a capability for a copy protect scheme or verification of television viewing activity. The video transform samples are extracted from a compressed packetized data stream and normalized if required. The auxiliary data modulates data carrier sequences such as pseudo-noise (PN) spread spectrum signals in different spatial frequencies to provide auxiliary data subband samples, which are in turn combined with the video transform samples in one or more spatial frequencies to provide combined subband samples. The auxiliary data subband samples may be also spectrally shaped according to the video transform samples to improve concealment. The combined transform samples are then multiplexed into the packetized data stream. Full decompression of the video transform samples is not required. In a decoder, the combined transform samples are demodulated to recover the auxiliary data signal.
A method for providing auxiliary data subband samples in a compressed digital video data stream, comprising the steps of:
A method for recovering auxiliary data subband samples representative of an auxiliary data signal from a compressed digital video data stream, said auxiliary data subband samples being provided by modulating a first data carrier sequence by said auxiliary data signal, said auxiliary data subband samples being carried with video transform samples in combined transform samples in said data stream, comprising the steps of:
An encoder for providing auxiliary data subband samples in a compressed digital video data stream, comprising:
A decoder for recovering auxiliary data subband samples representative of an auxiliary data signal from a compressed digital video data stream, said auxiliary data subband samples being provided by modulating a first data carrier sequence by said auxiliary data signal, said auxiliary data subband samples being carried with video transform samples in combined transform samples in said compressed digital data stream, comprising:
A compressed digital data storage media, comprising:
Dependencies are inferred from the claim text.