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Peak-Shaped-Based Steganographic Technique for JPEG Images

Author(s): Rossi Lorenzo | Garzia Fabio | Cusani Roberto

Journal: EURASIP Journal on Information Security
ISSN 1687-4161

Volume: 2009;
Issue: 1;
Start page: 382310;
Date: 2009;
Original page

A novel model-based steganographic technique for JPEG images is proposed where the model, derived from heuristic assumptions about the shape of the DCT frequency histograms, is dependent on a stegokey. The secret message is embedded in DCT domain through an accurate selection of the potentially modifiable coefficients, taking into account their visual and statistical relevancy. A novel block measure, named discrepancy, is introduced in order to select suitable areas for embedding. The visual impact of the steganographic technique is evaluated through PSNR measures. State-of-the-art steganalytical test is also performed to offer a comparison with the original model-based techniques.
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