This paper presents a new scheme for hiding two halftone secret images into two meaningful shares created from halftone cover images. Meaningful shares are more desirable than noiselike meaningless shares in Visual Secret Sharing because they look natural and do not attract eavesdroppers’ attention. Previous works in the field focus on either increasing number of secrets or creating meaningful ...

The objective of this work is to predict the deviations between spectral measurements obtained by different devices for halftone prints. To describe the physics, the transport theory is considered, and to accurately solve the governing equations for arbitrary phase functions, a stochastic Monte Carlo method is employed. Recently, a stencil approach was developed, which allows to speed up such M...

A technique for watermarking duplex printed pages is presented. The technique produces visible watermark patterns like conventional watermarks embedded in paper fabric. Watermark information is embedded in halftones used to print images on either side. The watermark pattern is imperceptible when images printed on either side are viewed independently but becomes visible when the sheet of paper i...

Reflectance models of halftone images, such as the Murray-Davis equation for monochrome and the Neugebauer equations for color, generally are not satisfactory predictors of average reflectance or tristimulus values (TSVs), even when used with the Yule-Nielsen nfactor. CIE colorimetric measurements of halftone dots and the paper between the dots for cyan, magenta, and yellow wax thermal transfer...

When processing document images, an important step is classifying the zones they contain into meaningful categories such as text, halftone pictures, line drawings, and mathematical formulae. A character recognition system, for example, may confine its attention to zones that are classified as text, while in an image compressor may employ specialized techniques and models for zones such as halft...

In our previous work, we have demonstrated techniques to embed and extract extrinsic signatures from halftone images and text documents. Well developed embedding algorithms should increase the payload capacity while enhance the reliability of detection. In this study, we will develop a printer model that will be used to optimize the embedding algorithm for capacity and detection reliability. Th...

A new blind inverse halftoning algorithm based on a nonlinear ltering technique of low computational complexity and low memory requirement is proposed in this research. It is called blind since we do not require the knowledge of the halftone kernel. The proposed scheme performs nonlinear ltering in conjunction with edge enhancement to improve the quality of an inverse halftoned image. Distinct ...