Modern Digital Halftoning, Second Edition (Signal Processing by Daniel L. Lau

By Daniel L. Lau

The past due Nineteen Eighties, innovative advances in electronic halftoning enabled inkjet printers to accomplish a lot better photo constancy. The fast fee of development has led to a number of breakthroughs scattered in the course of the literature, rendering outdated applied sciences out of date and renewing the necessity for a centralized resource at the present cutting-edge. solely revised and up-to-date, Modern electronic Halftoning, moment Edition presents an built-in and updated remedy of stochastic halftoning and electronic printing.

Using full-color illustrations to reinforce the textual content, this version contains new issues in addition to up to date versions, algorithms, and strategies used to build and enhance the standard of green-noise, blue-noise, and multitone photos. Following a assessment of assorted halftoning recommendations, this variation now covers amplitude modulated dither arrays, adapting to human visible types, direct binary seek, and dealing with stochastic moiré difficulties. It additionally offers a brand new bankruptcy on lenticular printing, a method for printing colour holographic pictures. An accompanying CD-ROM includes MATLAB® software program records and illustrated examples utilising algorithms, information, and different key innovations from the e-book.

Documenting the advance of electronic printing because the first edition, glossy electronic Halftoning, moment Edition deals a well-rounded and actual standpoint at the technological functions of electronic printing and offers all of the precious instruments for carrying on with examine within the field.

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Example text

13 (right) is the equivalent binary dither pattern for an inverse screen frequency twice that of Fig. 13 (left), where the larger component cells create a less visible beat pattern having a smaller amplitude. 5. 14: Ordering between sub-cells used to generate a 3 × 3 supercell. conglomerates of halftone sub-cells with consecutive threshold levels assigned across these sub-cells in a periodic or psuedo-random fashion. Specifically, the traditional technique of assigning a cost measure to each pixel inside a sub-cell is performed as it would be performed for a halftone cell in the prior technique in order to determine the order to which thresholds will be assigned in increasing order.

45 pixels. 1. 3: The (left) sample patterns and the (right) corresponding reduced second moment measures for completely random, hard core, and clustering point processes. © 2008 by Taylor & Francis Group, LLC 44 CHAPTER 3. 4: The (left) annular rings with center radius r and radial width Δr used to extract the pair correlation R(r) from the reduced second moment measure K[n; m] and (right) the pixels, shown crosshatched, of K[n; m] that form the annular ring for r = 3 14 pixels and Δr = 12 pixels.

Is a sample of Φ and will be written as φ = {xi ∈ 2 : i = 1, . . , N }. Furthermore, φ(B) is a scalar quantity defined as the number of xi s in the subset B of 39 © 2008 by Taylor & Francis Group, LLC 40 CHAPTER 3. 1: Diagram illustrating the point process Φ, a sample φ of the process, and the scalar quantity φ(B) as a function of the subset B of 2 . 2 . 1 illustrates these concepts of a point process. 1) where dVx is the infinitesimally small volume around x. In terms of a discrete dither pattern, Φ represents a stochastic halftoning process with Ig representing the binary dither pattern after applying Φ to a discrete-space monochrome image of constant gray-level g.

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