In this paper, we propose a novel data-hiding scheme for halftone images. Some data-hiding schemes for halftone images require referring to the original image or cover image. Then, if we have the half-tone image only, these schemes will not be able to work at all. Therefore, we propose a novel data-hiding scheme to improve them. In our new scheme, we directly embed secret bits into a halftone image, and, there-fore, the characteristics that make up halftone images are considered and made use of. The new scheme is built upon block-based hiding, where one secret is embedded into one block by parity check. In addition, two selection policies are proposed to improve the hiding effect. From the experiment results, we learn that our new scheme, compared with other data-hiding schemes, can provide an impressive secret message capacity while preserving acceptable visual quality. On the other hand, our scheme can also satisfy the three basic requirements a data-hiding scheme should respond to: invisibility, capacity, and data security.
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