Abstract
The joint photographic experts group (JPEG) is the most popular image format in our daily life, and it is widely used by digital cameras and other photographic capture devices. Recently, reversible data hiding (RDH) for JPEG images has become an active research area in the field of data hiding. In this paper, a new two-dimensional coefficient-histogram based RDH scheme for JPEG image is proposed. First, a two-dimensional quantized discrete cosine transform (DCT) coefficient-histogram is generated. Then, data are embedded according to a specifically designed coefficient-pair-mapping (CPM). Here, by the proposed approach, compared with the one-dimensional histogram-based RDH for JPEG images, the increased file size is minimized. Moreover, the selection strategy based on the optimal frequency band of the DCT coefficient-pairs is proposed, by which the distortion of the marked JPEG image is minimized. Compared to some state-of-the-art RDH methods for JPEG images, experimental results show the superiority of our methods both in image quality and increased file size.
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