US 8,620,018 B2 · Electronic watermark embedding method, device, and program, and electronic watermark detecting method, device, and program

Abstract

A digital watermark embedding apparatus for embedding embedding information into an input signal having dimensions equal to or greater than N(N is an integer equal to or greater than 2). The apparatus generates an embedding sequence based on the embedding information, generates an N−1-dimensional pattern based on the embedding sequence, generates an N-dimensional embedding pattern by modulating a periodic signal according to a value on the N−1-dimensional pattern, and superimposes the embedding pattern in the input signal and outputs it. A digital watermark detection apparatus measures a component of a predetermined periodic signal in a direction of a dimension of the input signal to obtain an N−1-dimensional pattern, obtains a detection sequence from values of the N−1 dimensional pattern, and detects the embedded digital watermark based on a size of correlation value between the detection sequence and an embedding sequence.

Claims24

Dependent claims

A digital watermark detecting method for detecting a digital watermark that is embedded beforehand into an input signal having dimensions equal to or greater than N (N is an integer equal to or greater than 2) such that it is imperceptible to human senses in a digital watermark detection apparatus including demodulation means, detection sequence extraction means, correlation value calculation means, and storage means, the method comprising:

measuring, at the demodulation means, a component of a predetermined periodic signal in a direction of a dimension in the input signal to obtain a N−1-dimensional pattern;
obtaining, at the detection sequence extraction means, a detection sequence from values of the N−1-dimensional pattern and storing the detection sequence in the storage means;
and
detecting, at the correlation value calculation means, the embedded digital watermark based on a size of a correlation value between the detection sequence stored in the storage means and an embedding sequence.

1 more element

Dependencies are inferred from the claim text.

Electronic watermark embedding method, device, and program, and electronic watermark detecting method, device, and program

Life of this patent

Electronic watermark embedding method, device, and program, and electronic watermark detecting method, device, and program

Life of this patent

Abstract

Claims24