A Scheme of PVO with Median Preserving upon Reversible Data Hiding Using Adaptive Embedding Mechanisms
Hao-Yu Weng, Cheng-Ta Huang, Shiuh-Jeng Wang, Cheng-Hsing Yang, Chang-Po Chiang · 2024
This paper presents a novel reversible data hiding (RDH) technique based on pixel value ordering (PVO) and median preserving (MP) for improving image quality. In the proposed method, an adaptive block-wise embedding mechanism is applied. In PVO-based RDH, embedding data into a smooth block is always leading to a better image quality. For each block, the complexity is first calculated using surrounding blocks and then set a threshold in order to measure whether this block is a smooth or a complex block. The smooth blocks are embedded with secret data, and the complex blocks are skipped based on the threshold value. Therefore, this mechanism better exploits smooth blocks for data embedding, resulting in improved image quality. Experimental results demonstrate that the proposed method achieves a higher PSNR value than the previous approach.