An adaptive JPEG steganographic scheme based on the block entropy of DCT coefficients

作者：Wang Chang; Ni Jiangqun; Wang Chuntao; Zhang Ruiyu

来源：International Journal of Digital Crime and Forensics, 2012, 4(2): 13-27.

DOI：10.4018/jdcf.2012040102

• Block entropy
• Candidate solution
• Content-adaptive
• DCT coefficients
• Detectability
• Distortion effects
• Embedding capacity
• Embedding distortion
• JPEG
• Minimal distortion
• Rounding errors
• Steganalysis
• Steganographic schemes
• Steganographic system
• Trellis coding

Minimizing the embedding impactis a practically feasible philosophy in designing steganographic systems. The development of steganographic systems can be formulated as the construction of distortion profile reflecting the embedding impact and the design of syndrome coding based on a certain code. The authors devise a new distortion profile exploring both the block complexity and the distortion effect due to flipping and rounding errors, and incorporate it in the framework of syndrome trellis coding (STC) to propose a new JPEG steganographic scheme. The STC provides multiple candidate solutions to embed messages to a block of coefficients while the constructed content-adaptive distortion profile guides the determination of the best solution with minimal distortion effect. The total embedding distortion or impact would be significantly reduced and lead to the less detectability of steganalysis. Extensive experimental results demonstrate that the proposed JPEG steganographic scheme greatly increases the secure embedding capacity against steganalysis and shows significant superiority over some existing JPEG steganographic approaches.

• 出版日期2012
• 单位中山大学