Authentication watermark is a hidden data inserted into an image that can be used to detect any accidental or malicious alteration in the image. In the literature, there are many authentication-watermarking techniques for continuous-tone images. However, quite a small number of secure authentication watermarking techniques are available for binary/halftone images. This paper proposes a simple s...

A mathematical model which provides the relationship between the dot areas of a combination of halftone patterns and the color produced by such multi-colored halftone patterns is disclosed. Such a model has application in calibration of digital color systems, digital picture exchange, and the simulation of “spot color” using process color techniques. The new model is an extension of the Spectra...

Different inks may have different mechanical and/or optical properties. Existing Yule-Nielsen modified Neugebauer spectral prediction models assume however that the inks forming a color halftone behave similarly, i.e. that a single n-factor can model the lateral propagation of light within the paper as well as non-uniformities of the ink dot thickness profiles. However, if the inks have very di...

1. Gel’fand, S., Pinsker, M.: Coding for channel with random parameters. Problems of Control and Information Theory 9 (1980) 19–31 2. Eggers, J., Su, J., Girod, B.: A blind watermarking scheme based on structured codebooks. In: Secure Images and Image Authentication, IEE Colloquium, London, UK (2000) 4/1–4/6 Conclusions and Future Work • Halftone quantization: it exploits the fact that there ex...

Digital halftoning provides a mechanism for rendering continuous-tone images on devices such as printers. With electrophotography, the deposition of toner within the area of a given printer addressable pixel is strongly influenced by the halftone values of the immediately neighboring pixels. To account for these effects, it is necessary to embed a printer model in the halftoning algorithm. In o...

We extend a previously proposed spectral reflectance and transmittance prediction model for recto-verso prints to the case of multi-ink halftones. The model takes into account the multiple reflections and the lateral propagation of light within the paper substrate (optical dot gain) as well as the spreading of the inks according to their superposition conditions (mechanical dot gain). The model...