Shaowei Weng1, 2, *, Yiyun Liu1, Yunqing Shi3, Bo Ou4, Chunyu Zhang5, Cuiping Wang6
CMC-Computers, Materials & Continua, Vol.62, No.1, pp. 157-177, 2020, DOI:10.32604/cmc.2020.05681
Abstract This paper proposes a two-step general framework for reversible data hiding
(RDH) schemes with controllable contrast enhancement. The first step aims at preserving
visual perception as much as possible on the basis of achieving high embedding capacity
(EC), while the second step is used for increasing image contrast. In the second step, some
peak-pairs are utilized so that the histogram of pixel values is modified to perform
histogram equalization (HE), which would lead to the image contrast enhancement.
However, for HE, the utilization of some peak-pairs easily leads to over-enhanced image
contrast when a large number of bits are embedded.… More >
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