Algorithm

Chaotic

Digital watermarking

Materials science

Computer security

Circulant matrix

Computer science

Integer (computer science)

Watermark

Embedding

Matrix (chemical analysis)

Discrete cosine transform

Singular value decomposition

Mathematics

Image (mathematics)

Domain (mathematical analysis)

Block (permutation group theory)

Mathematical analysis

Artificial intelligence

Composite material

Combinatorics

Programming language

Arithmetic

Journal of Visual Communication and Image Representation

In this paper, a robust watermarking technique is proposed using integer discrete cosine transform, non-linear chaotic map and dynamic stochastic resonance (DSR). Firstly, the host image is transformed into integer DCT domain where the coefficients are partitioned into non-over-lapping blocks. A circulant matrix is then constructed from the selected blocks. Block selection is done using a non-linear chaotic map. This circulant matrix is used for embedding the watermark by computing the singular values. The extraction of the watermark is done by producing the dynamic stochastic resonance (DSR) phenomena and casting a verification step. This verification step essentially solves the false positive detection problem that arises in SVD based watermarking. The experimental results demonstrate that the proposed scheme is imperceptible and robust against a variety of intentional or unintentional attacks.

A new robust watermarking system in integer DCT domain