Embedder for embedding a watermark into an information representation, detector for detecting a watermark in an information representation, method and computer program

摘要

An embedder for embedding a watermark to be embedded into an input information representation comprises an embedding parameter determiner that is implemented to apply a derivation function once or several times to an initial value to obtain an embedding parameter for embedding the watermark into the input information representation. Further, the embedder comprises a watermark adder that is implemented to provide the input information representation with the watermark using the embedding parameter. The embedder is implemented to select how many times the derivation function is to be applied to the initial value.

主权项

1. An embedder for embedding a watermark to be embedded into an input information representation, comprising:
an embedding parameter determiner that is implemented to apply a derivation function to an initial value, once or several times, to acquire an embedding parameter for embedding the watermark to be embedded into the input information representation; and a watermark adder that is implemented to provide the input information representation with the watermark to be embedded using the embedding parameter, wherein the embedder is implemented to select how many times the derivation function is to be applied to the initial value to acquire the embedding parameter; wherein the embedding parameter determiner is implemented to receive an index parameter and to determine, depending on the index parameter, how many times the derivation function is to be applied to the predetermined initial value to acquire the embedding parameter; and wherein the embedder comprises a watermark information detector that is implemented to detect watermark information already comprised in the input information representation, to acquire information on a number of watermarks already comprised in the input information representation, and wherein the watermark information detector is implemented to provide one or several index parameters for the embedding parameter determiner, based on the information on the number of watermarks already comprised in the input information representation; wherein the embedder is implemented using a hardware apparatus, or using a computer, or using a combination of a hardware apparatus and a computer.