I propose a model for predicting the total reflectance of color halftones printed on paper incorporating fluorescent brighteners. The total reflectance is modeled as the additive superposition of the relative fluorescent emission and the pure reflectance of the color print. The fluorescent emission prediction model accounts for both the attenuation of light by the halftone within the excitation...

Visual cryptography encodes a secret binary image (SI) into shares of random binary patterns. The decoding process of a visual cryptography scheme, which differs from traditional secret sharing, does not need any cryptographic algorithms like symmetric and asymmetric algorithms. Visual cryptography is based on the images and is obtained by sending pixel information and stacking of pixels for re...

This paper presents an approach for enhancing digital color images printed in halftoning. The method, which we call Selective Conditional Enhancement, has been applied with good results to enhance digital color images printed in halftone. Due to the repetitive nature of the process for image digitizing and the common structure of patterns used to create halftone in color images, it has been obs...

In this paper we have proposed digital watermarking scheme for halftone images based on visual cryptography scheme. The scheme does not embed the watermark directly on the halftone image instead watermark will be divided into the parts called as shares. The scheme not only protects the watermark but also provides an effective copyright protection scheme. At the time of watermark embedding verif...

With the advent of high resolution (1200+ dpi) desktop printers, the use of conventional 128 128 screens can produce a distinctive periodicity in the printed images. A new method for design of multiple 32 32 screens using Direct Binary Search and training is proposed. The screens are seamless with each other; and a small number of these screens are randomly tiled over the entire support of the ...

Color laser printers have fast printing speed and high resolution, and forgeries using color laser printers can cause significant harm to society. A source printer identification technique can be employed as a countermeasure to those forgeries. This paper presents a color laser printer identification method based on cascaded learning of deep neural networks. The refiner network is trained by ad...

In the security of digital contents, almost all previous works tried to attend either the copyright protection issue or the content authentication issue, however recently some proposals try to solve simultaneously both problems. In this paper, a multipurpose method that tries to solve both problems for color images, using two watermarking algorithms, is proposed. The first algorithm is based on...

The blue noise mask (BNM) is a halftone screen that produces unstructured, visually pleasing halftone images. Since it is a point process, halftoning using the BNM can be implemented considerably faster than error diffusion and other algorithms. However, in the construction of the original BNM, a number of constraints were used to llmit its characteristics in the spatial and frequency domains. ...