Control of Color Imaging Systems Analysis and Design

A Complete One-Stop Resource While digital color is now the technology of choice for printers, the knowledge required to address the quality and productivity issues of these devices is scattered across several technologies, as is its supporting literature. Bringing together information from diverse fields, Control of Color Imaging Systems: Analysis and Design is the first book to provide comprehensive coverage of the fundamentals and algorithms of the numerous disciplines associated with digital color printing in a single resource. The authors review the history of digital printing systems, explore its current status, and explain fundamental concepts, including: digital image formation, sampling, quantization, image coding, spot color calibration, and one- and multi-dimensional tone control of color management systems — including process physics and controls. A Complete Self-Tutorial With Over 150 Design Examples and 120 Exercise Problems Based on the authors’ three decades of hands-on technical and teaching experience, the text provides engineers and technicians with an end-to-end understanding of the color printing process, and helps them build a foundation drawn from the diverse disciplines needed to manage and control digital production printers. The control theory and methods presented in this book are state-of-the art for color printing systems; however, coverage of theoretical concepts and mathematics are kept to the basics, as the book is designed to teach hand’s on skills that will allow practitioners to gain an immediate understanding of quality and productivity concerns. The understanding provided will help practitioners build the technical skills needed to help pioneer the next generation of ideas, algorithms, and methods that will further expand the frontier of this rapidly evolving technology.

Preface Acknowledgments An Overview of Digital Printing Systems Introduction Printing and Publishing System Digital Front End Digital Print Engine (Electrophotographic) Evolution of Controls Technology for Digital Printers—Color Controls View Prepress-Based Processing DFE-Based Processing Print Engine-Based Processing References Fundamentals of Digital Image Processing Introduction Digital Image Formation and Systems Optical and Modulation Transfer Functions Image Sampling and Quantization Image Transform Image Filtering Image Resizing Image Enhancement Image Restoration Image Halftoning Problems References Mathematical Foundations Introduction General Continuous-Time System Description Laplace Transform General Linear Discrete-Time Systems z-Transform Discrete-Time Fourier Transform Two-Dimensional z-Transform Two-Dimensional Discrete-Space Fourier Transform Eigenvalues and Eigenvectors Singular Value Decomposition Matrix Polynomials and Functions of Square Matrices Fundamentals of Matrix Calculus Problems References State-Variable Representation Introduction Concept of States State-Space Representation of Continuous-Time Systems State-Space Representation of General Continuous LTI Systems Solution of LTI Continuous-Time State Equations State-Space Representation of Discrete-Time Systems State-Space Representation of Discrete-Time LTI Systems Solution of LTI Discrete-Time State Equations Controllability of LTI Systems Observability of LTI Systems Problems References Closed-Loop System Analysis and Design Introduction State Feedback LQR Design State Estimators (Observers) Design Combined State Estimation and Control Problems References Interpolation of Multidimensional Functions Introduction Interpolation of Uniformly Spaced Lookup Tables Nonuniformly Spaced Lookup Tables Lookup Table Inverse Compression of Lookup Tables Smoothing Algorithm for Multidimensional Functions Problems References Three-Dimensional Control of Color Management Systems Introduction Image Path Architecture Profiling—A Complex System Problem Characterization of Color Systems GCR Selection and Inversion Gamut-Mapping Methods Evaluation of Profiles An Example Showing How to Build Multidimensional LUT Problems References One-Dimensional, Two-Dimensional, and Spot-Color Management and Control Methods Introduction Principles of Color Management One-Dimensional Gray-Balance Calibration Two-Dimensional Calibration One-Dimensional and Two-Dimensional Printer Calibration Using Printer Models One-Dimensional and Two-Dimensional Printer Calibration with State-Feedback Methods Spot-Color Control Problems References Internal Process Controls Introduction Process Control Models—A General Control View Time Hierarchical Process Control Loops Level 1 Electrostatic Control System State Space to Transfer Function Conversions Level 2 Developability Controller Steady-State Error Design of the Gain Matrix Level 3 Control Loops Dead Beat Response TC Control Loop Process Controls Under Limited Actuation Optimal Controls for Selective States Optimal Measurements Problems References Printing System Models Introduction Process Models Modulation Transfer Functions Tone Reproduction Curve Image Simulation with Fusing and Color Models Virtual Printer Color Gamut Virtual Printer Model Tuning to an Experimental Printer Problems References Appendices (A-C) Index