An adaptive embedding pattern plus a two-level predictor improves the PSNR of grayscale-invariant reversible data hiding by about 1 dB over Hou et al.'s method.
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Adaptive Embedding Pattern for Grayscale-Invariance Reversible Data Hiding
An adaptive embedding pattern plus a two-level predictor improves the PSNR of grayscale-invariant reversible data hiding by about 1 dB over Hou et al.'s method.