| 摘要 |
An apparatus for embedding data in material information comprises an embedding processor operable to select at least one symbol of the material information for embedding a symbol of the data, to compare a value of the material symbol with an embedding scale divided into predetermined regions, each of the regions being associated with a value of the data symbol, and consequent upon the comparison to adjust the value of the material information symbol to fall within the nearest of the predetermined regions of the embedding scale associated with the value of the data symbol to be embedded, wherein at least one adjacent region of the embedding scale is associated with the same value of the data symbol to be embedded. Hence, there is an increased likelihood of correctly recovering embedded data, or conversely reducing an amount by which the material symbols must be changed whilst providing an improved immunity to noise. |
