In this paper; we propose new data hiding method for image half toning. The proposed method can data hiding is achieved in the half toning process. Comparing with the other data hiding method for binary images, the proposed method can hide larger amount of data. For data hiding, we propose the block error diffusion method to hide multilevel data in image blocks. The binary image that is obtained by the proposed method can contain two through eight level data in each image blocks. In the experiments, we compare the proposed method and the conventional data hiding half toning from the relationship between the amount of the embedded data and the quality of halftone images.
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