Frequential-based data modifying method and device
AssigneeKoninklijke Philips Electronics N.V.
InventorYann Le Maguet
Life of this patent
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Abstract
A method of modifying data in an encoded data signal 128 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 129. In particular, this model can be used for the insertion of an additional data signal 130 into a compressed video data signal 128. The proposed arrangements/diagrams according to the method are based on a transcoder arrangement including at least partial decoding and partial re-encoding. This method leads to a cost-effective solution compared with the prior art comprising a minimum number of functional DCT/IDCT sub-steps, taking advantage of simplifications and combinations between different sub-steps.
Claims4
A method of modifying data in an encoded data signal comprising:
- a) a decoding step for decoding said encoded data signal and providing a decoded data signal,
- b) a re-encoding step performed on a modified data signal,
- c) a step for providing a pixel-based residual signal, which results from a difference between a predicted signal of an additional data signal and said additional data signal,
- characterized in that the method further comprises:
- d) a conversion step for providing a frequential residual signal resulting from a frequential conversion of said pixel-based residual signal,
- e) a sub-step for adding said frequential residual signal to said decoded data signal, so as to provide said modified data signal.
A transcoding device for adding data to an encoded data signal, comprising:
- a) decoding means for decoding said encoded data signal and providing a decoded data signal,
- b) re-encoding means for re-encoding a modified data signal,
- c) means for providing a pixel-based residual signal, which results from the difference between a predicted signal of an additional data signal and said additional data signal,
- characterized in that the device further comprises:
- d) conversion means for providing a frequential residual signal resulting from a frequential conversion of said pixel-based residual signal,
- e) means for adding said frequential residual signal to said decoded data signal, so as to provide said modified data signal.
Dependencies are inferred from the claim text.