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A Secret-Sharing-Based Method for Authentication of Grayscale Document Images via the Use of the PNG Image with a Data Repair Capability

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Academic year: 2022

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Fig. 1. A binary-like grayscale document image with two major gray values.
Fig. 2. Illustration of creation of a PNG image from a grayscale document image  and an additional alpha channel plane
Fig. 4 Authentication process including verification and self-repairing of a stego-image in PNG format
Fig. 5. Illustration of embedding six shares created for a block  two shares  embedded  at  the  current  block  and  the  other  four  in  four  randomly-selected  pixels outside the block, with each selected pixel not being the first two ones in  any bl
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