Nowadays, halftone images appear routinely in books, magazines, printer outputs, and fax documents. It is desirable to embed data in halftone images for copyright protection and content authentication. This paper proposes a novel watermarking scheme for halftone image authentication, exploiting image hash as a fragile watermark. After pixel blocking and ordering, a lookup table is constructed a...

In industrial pattern reproduction, clustered-dot screens are usually created to transform continuous tone image into halftone image for batch printing. But the algorithms generating clustered-dot screens are usually difficult to process large image because they are very slowly and need lot of memory. In addition, the generated halftone image often have periodic patterns, leading to poor tone r...

Improved gray-scale (IGS) quantization is a known method for re-quantizing digital gray-scale images for data compression while producing halftones by adding a level of randomness to improve visual quality of the resultant images. In this paper, first, analyzing the IGS quantizing operations reveals the capability of conserving a DC signal level of a source image through the quantization. Then,...

Printing material and prints undergo changes during ageing which can be recognized in deterioration in the physical, chemical and optical properties. The aim of this work is to determine the optical changes of the prints caused by ageing of the printing material and of the prints obtained by the application of the indirect electrophotography. The change of the screen elements in lighter halfton...

The stochastic screen has traditionally been used to preserve images with fine features as well as to reduce printing Moiré of images that contain input periodic structures. However, the stochastic screen also has experienced more difficulty in maintaining color stability in long press runs. Kodak, using its multilevel printing architecture, has created a new stochastic screening technology, wi...

We propose a framework for printing high chroma and bright colors which are beyond both the display sRGB and the classical cmyk print gamuts. These colors are printed with a combination of classical cmyk inks and the two additional daylight fluorescent magenta and yellow inks. The goal is to enhance image parts by printing them with high chroma and bright colors. We first select the image parts...

For many years, researchers have investigated information science, such as image analysis (Besag, 1974, Winkler, 1995, Cressie, 1993). Especially, image restoration has been studied as a fundamental problem in information science. In a recent development of this field, theoretical physicists have applied statistical mechanics to information based on analogy between statistical mechanics and Bay...

n v u a i g c m bstract. The Yule–Nielsen modified spectral Neugebauer model YNSN) enhanced for accounting for ink spreading in the different nk superposition conditions provides accurate spectral predictions, ut requires one to measure the reflectances of special halftone alibration patches in order to compute the ink spreading curves apping nominal ink surface coverage to effective ink surfac...

Neugebauer modeling plays an important role in obtaining end-to-end device characterization profiles for halftone color printer calibration. This paper proposes total least square (TLS) regression methods to estimate the parameters of various Neugebauer models. Compared to the traditional least squares (LS) based methods, the TLS approach is physically more appropriate for the printer modeling ...