Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
View Patent ↗Disclosed herein are methods and systems for encoding digital watermarks into content signals. Also disclosed are systems and methods for detecting and/or verifying digital watermarks in content signals. According to one embodiment, a system for encoding of digital watermark information includes: a window identifier for identifying a sample window in the signal; an interval calculator for determining a quantization interval of the sample window; and a sampler for normalizing the sample window to provide normalized samples. According to another embodiment, a system for pre-analyzing a digital signal for encoding at least one digital watermark using a digital filter is disclosed. According to another embodiment, a method for pre-analyzing a digital signal for encoding digital watermarks comprises: (1) providing a digital signal; (2) providing a digital filter to be applied to the digital signal; and (3) identifying an area of the digital signal that will be affected by the digital filter based on at least one measurable difference between the digital signal and a counterpart of the digital signal selected from the group consisting of the digital signal as transmitted, the digital signal as stored in a medium, and the digital signal as played backed. According to another embodiment, a method for encoding a watermark in a content signal includes the steps of (1) splitting a watermark bit stream; and (2) encoding at least half of the watermark bit stream in the content signal using inverted instances of the watermark bit stream. Other methods and systems for encoding/decoding digital watermarks are also disclosed.
1. A system for encoding a watermark in a digital signal, comprising:
a generator for generating a plurality of watermark pseudo-random key bits wherein the generator is selected from the group consisting of a non-linear generator and a chaotic generator; and
an encoder for encoding the watermark in the digital signal using the watermark pseudo-random key bits and characteristics of the digital signal.
2. A system for encoding a watermark in a digital signal, comprising:
a mapper for mapping pseudo-random key and processing state information to effect an encode/decode map using a generator wherein the generator is selected from the group consisting of a non-linear generator and a chaotic generator; and
an encoder for encoding the watermark in the digital signal using the encode/decode map and characteristics of the digital signal.
3. A system for encoding a watermark in a digital signal, comprising:
a generator for generating a plurality of key bits;
an identifier for identifying candidate bits in the digital signal; and
an encoder for encoding the watermark in the identified candidate bits using key bits wherein the candidate bits are masked.