Abstract
On the basis of analysis of steganographic system as a communications system with additional information, data transmission algorithms with modulation of the quantization index allowing for elimination of the hampering effect of a signal-carrier have been investigated. It was shown that the choice of quantization step enables us to effectively solve the trade-off task of building a stegosystem: distortions-rate-robustness, while the normalization of quantization step to the root-mean-squre value of signal-carrier in the coder and decoder eliminates the influence of constant multiplicative interference in the channel. Analitical relationships were obtained for the error probability in a channel with additive white noise. Recommendations regarding the selection of transformants of discrete cosine transform (DCT) for imformation embedding into static pictures subjected to the standardized procedure of JPEG DCT compression were given.
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