Hiding a Secret Pattern into Color Halftone Images

摘要

This paper proposes an effective color halftone image visual cryptography method to embed a binary secret pattern into dot diffused color halftone images, Data Hiding by Dual Color Conjugate Dot Diffusion (DCCDD). DCCDD considers inter-channel correlation in order to restrict the embedding distortions between different channels within an acceptable range. Compared to the previous method, the proposed method can hide a secret pattern into two halftone color images which come from different original multitone images. The experimental results show that DCCDD can embed a binary secret pattern into two color halftone images which can be generated from identical or different original multitone color images. When the two halftone images are overlaid, the secret pattern will be revealed.