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Authentication and recovery of an image by sharing and lattice-embedding

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Fig. 1 Diagram of our lattice embedding.
Fig. 3 Robustness test of the proposed method. (a) to (d) our four watermarked images “Lena,” “Pep-
Table 1 PSNR quality of watermarked image and attack-tolerance (for various quantization step value M )
Fig. 5 Collage attack: (a) first watermarked image “Boat;” (b) second watermarked image “House,” (c)
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