[Retracted] Cryptospace Invertible Steganography with Conditional Generative Adversarial Networks

Figure 15

Examples of RSI maps by spatial, spectral, and structural analyses with respect to different block sizes. Regular, singular, and indeterminate blocks are coloured in black, white, and grey, respectively. (a) Spatial₂. (b) Spatial₄. (c) Spatial₈. (d) Spatial₁₆. (e) Spatial₃₂. (f) Spectral₂. (g) Spectral₄. (h) Spectral₈. (i) Spectral₁₆. (j) Spectral₃₂. (k) Structural₂. (l) Structural₄. (m) Structural₈. (n) Structural₁₆. (o) Structural₃₂.

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