Improving Anticompression Robustness of JPEG Adaptive Steganography Based on Robustness Measurement and DCT Block Selection

Figure 12

Two cover examples, i.e., (a) No. 10 and (e) No. 6222 in BOSSBase and the corresponding modification position in spatial domain generated by J-UNIWARD, i.e., (b) and (f), GMAS, i.e., (c) and (g), and CBSRS, i.e., (d) and (h) for relative payload 0.3 bpnzAC with quality factor of 85 and STCs, respectively. In this subsection, the accuracy of the cover reconstruction is evaluated. For the cover images size , 4096 bit indicators are required to reconstruct the location of the cover element. To decrease the size of auxiliary information and increase the accuracy of the cover reconstruction, the indicators of each block are quantized in each units for the robustness distribution in natural images continuous with the image content. Meanwhile, (31, 15) RS codes are adopted with bit-interleaved coding to further reduce the extraction error rate. Thus, 2,170 bit auxiliary information is encoded with the chrominance channel of each cover image in the experiment.

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