The Halftone Image Watermarking Algorithm Based on Error Diffusion

Halftone image watermarking is an important direction of research and application in the field of information hiding now. This paper proposed a halftone image watermarking algorithm based on error diffusion. It is an effective measure to copyright protection of printed matter, source authentication and prevented forgery etc. This algorithm embedded watermarking image information as an error signal into the pixels adjacent to this location by error diffusion algorithm. Information embedding was completed synchronously with halftone. So watermarking extraction is simple and fast. Experiments show that this algorithm can embed a binary watermarking image into the halftone image with the same size. This algorithm has a good performance in resistance to a variety of attacks (such as noise jamming, fouling, and rotation etc.).So it has certain practical value.