Error-Diffused Image Security Improving Using Overall Minimal-Error Searching
This study presents a high capacity data hiding method for generating high quality watermarked halftone images. The embedded watermarks can be distributed into single or multiple halftone images with the proposed Overall Minimal-Error Searching (OMES). The proposed method modifies the halftone values at same position of all host images with the trained Substitution Table (S-Table). The S-Table makes the original combination of these halftone values as another meaningful combination for embedded watermark, which is the key part in determining the image quality. Hence, an optimization procedure is proposed to achieve the optimized S-Table. As demonstrated in the experimental results, the proposed approach provides good image quality and is able to guard against some frequent happened attacks in printing applications.
KeywordsDigital watermarking digital halftoning error diffusion iteration-based halftoning ordered dithering overall minimal-error searching
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