Digital halftoning
Data hiding watermarking for halftone images
IEEE Transactions on Image Processing
Hybrid pixel-based data hiding and block-based watermarking for error-diffused halftone images
IEEE Transactions on Circuits and Systems for Video Technology
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This letter presents an improved visible watermarking scheme for halftone images. It incorporates watermark embedding into ordered dither halftoning by threshold modulation. The input images include a continuous-tone host image (e.g. an 8-bit gray level image) and a binary watermark image, and the output is a halftone image with a visible watermark. Our method is content adaptive because it takes local intensity information of the host image into account. Experimental results demonstrate effectiveness of the proposed technique. It can be used in practical applications for halftone images, such as commercial advertisement, content annotation, copyright announcement, etc.