Color quick response (QR) code is an important direction for the future development of QR code, which has become a research hotspot due to additional functional characteristics its colors as wide application technology. The existing color solved problem information storage capacity, but it requires enormous hardware and software support system, making how achieve direct readability urgent issue...

We propose a new spectral prediction model as well as new approaches for modeling ink spreading which occurs when printing ink layer superpositions. The spectral prediction model enhances the classical ClapperYule model by taking into account the fact that proportionally more incident light through a given colorant surface is reflected back onto the same colorant surface than onto other coloran...

A low computational complexity noise-balanced error diffusion (NBEDF) technique is proposed for embedding watermark into error-diffused images. The visual decoding pattern can be perceived when two or more similar NBEDF images are overlaid each other, even in a high activity region. Furthermore, with the modified improved version of NBEDF, the two halftone images can be made from two total diff...

We propose a spectral prediction model for predicting the reflectance and transmittance of recto-verso halftone prints. A recto-verso halftone print is modeled as a diffusing substrate surrounded by two inked interfaces in contact with air (or with another medium). The interaction of light with the print comprises three components: (a) the attenuation of the incident light penetrating the print...

Spectral prediction models for halftone prints generally assume homogeneously thick and sharply edged ink dots, i.e., bilevel halftones. In real prints, the ink thickness often decreases at the boundaries of the ink dots, thereby forming continuous-level halftones. The present study aims at verifying to what extent the classical Clapper-Yule and Yule-Nielsen models are able to predict the refle...

A digital halftone of blue noise characteristics is preferred as dots in the halftone of a constant input should be isotropically and homogeneously distributed. In practice, the placement of dots is constrained by a sampling grid and hence aliasing happens when the input gray level is in the middle range. To solve this problem, Lau et al. suggested replacing isolated dots by dot clusters to mai...

“ b h o f t M d c 0 o t t p t d t d bstract. The Yule–Nielsen modified spectral Neugebauer model YNSN) enhanced for accounting for ink spreading in the different nk superposition conditions requires a spectrophotometer to meaure the reflectances of halftone calibration patches in order to comute the ink spreading curves mapping nominal ink surface coverge to effective ink surface coverage. Inst...

A spectral-based six-color printer model was derived in determining the six color separations for an input spectral image that yields the least metameric reproduction relative to the original. Confined by the ink-trapping limitation, the six-color halftone printer modeling effort is a union of ten four-color halftone printer modeling efforts in addition to a four-ink selector. The four-ink sele...

We propose an extension of the cellular Yule-Nielsen spectral Neugebauer model accounting for ink spreading of each ink within each subdomain. Characterization of the ink spreading within a given subdomain is performed by fitting the mid-range weights of subdomain node reflectances with the goal of minimizing the sum of square differences between predicted and measured mid-range reflectances. W...