JPEG Steganography and Synchronization of DCT Coefficients for a Given Development Pipeline - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2020

JPEG Steganography and Synchronization of DCT Coefficients for a Given Development Pipeline

Résumé

This paper proposes to use the statistical analysis of the correlation between DCT coefficients to design a new synchronization strategy that can be used for cost-based steganographic schemes in the JPEG domain. First, an analysis is performed on the covariance matrix of DCT coefficients of neighboring blocks after a development pipeline similar to the one used to generate BossBase, and applied on a photonic noise. This analysis exhibits (i) a decomposition into 8 disjoint sets of uncorrelated coefficients (4 sets per block used by 2 disjoint lattices) and (ii) the fact that each DCT coefficient is correlated with 38 other coefficients belonging either to the same block or to connected blocks. Using the uncorrelated groups, an embedding scheme can be designed using only 8 disjoint lattices. The proposed embedding scheme relies on ingredients. Firstly, we convert the empirical costs associated to one each coefficient into a Gaussian distribution whose variance is directly computed from the embedding costs. Secondly we derive conditional Gaussian distributions from a multivariate distribution considering only the correlated coefficients which have been already modified by the embedding scheme. This covariance matrix takes into account both the correlations exhibited by the analysis of the covariance matrix and the variance derived from the costs. This synchronization scheme enables to obtain a gain of $P_E$ of at least $7\%$ at $QF95$ for an embedding rate close to 0.3 bnzac coefficient using DCTR feature sets for both UERD and JUniward.
Fichier principal
Vignette du fichier
IH-woCopy.pdf (1.32 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02553023 , version 1 (24-04-2020)
hal-02553023 , version 2 (22-09-2020)

Identifiants

Citer

Théo Taburet, Patrick Bas, Wadih Sawaya, Rémi Cogranne. JPEG Steganography and Synchronization of DCT Coefficients for a Given Development Pipeline. ACM Workshop on Information Hiding and Multimedia Security, Jun 2020, Denver, United States. ⟨10.1145/3369412.3395074⟩. ⟨hal-02553023v2⟩
132 Consultations
161 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More