Print-Scan Resilient Text Image Watermarking Based on Stroke Direction Modulation for Chinese Document Authentication

Print-scan resilient watermarking has emerged as an attractive way for document security. This paper proposes an stroke direction modulation technique for watermarking in Chinese text images. The watermark produced by the idea offers robustness to print-photocopy-scan, yet provides relatively high embedding capacity without losing the transparency. During the embedding phase, the angle of rotatable strokes are quantized to embed the bits. This requires several stages of preprocessing, including stroke generation, junction searching, rotatable stroke decision and character partition. Moreover, shuffling is applied to equalize the uneven embedding capacity. For the data detection, denoising and deskewing mechanisms are used to compensate for the distortions induced by hardcopy. Experimental results show that our technique attains high detection accuracy against distortions resulting from print-scan operations, good quality photocopies and benign attacks in accord with the future goal of soft authentication

Parametric classification in domains of characters, numerals, punctuation, typefaces and image qualities

This thesis contributes to the Optical Font Recognition problem (OFR), by developing a classifier system to differentiate ten typefaces using a single English character ‘e’. First, features which need to be used in the classifier system are carefully selected after a thorough typographical study of global font features and previous related experiments. These features have been modeled by multivariate normal laws in order to use parameter estimation in learning. Then, the classifier system is built up on six independent schemes, each performing typeface classification using a different method. The results have shown a remarkable performance in the field of font recognition. Finally, the classifiers have been implemented on Lowercase characters, Uppercase characters, Digits, Punctuation and also on Degraded Images

The Economy Of Typography (the Arrangement or Mode of Operation of Typography)

The thesis will show that the current research into legibility and readability regarding certain aspects or characters of type is incomplete, and will demonstrate what further research is necessary to complete the analysis of these aspects or characters in the economy of typography in continuous text. Chapter 1 will show that the development of reading depends on the legibility of the typography and characters ‘recognizing patterns, planning strategy, and feeling’ in other words reading and writing are interdependent all depend in some part on the construction of the characters and their relationship to each other. It will also show that readable writing is desirable and important for the reader’s sake. Chapter 2 will deal with the practical presentation of the characters of what the reading public read, and the role played by legibility and readability of typography in conveying their message. Printers and designers will also have a working knowledge and experience of legibility and readability which is incorporated into typograhy presentations, and this also is taken into account in chapter 2. Chapter 3 reviews the criteria and methods used in typography readability and legibility research. The research will show that readability is the ease with which the eye can absorb the message and move along the line, and legibility is based on the ease with which one letter can be identified from another. Chapter 4 entitled Analysis and Recommendations concludes the thesis with a summary of chapters 1, 2 and 3 before presenting a comparative analysis of current research into legibility, with particular emphasis on misreading or misrecognition of characters, and provides illustrations of the conclusions reached by way of bar chart and tables. Appendix One of the thesis contains a comprehensive list of the research into legibility and readability. Appendix Two contains the graphics of Benjamin Sherbow showing typography layout supportive of type spacing matters discussed in chapter 2. The thesis has an extensive bibliography of the works referred to throughout the thesis

A critical analysis of local and global cultural factors in graphic wayfinding design: a case study of Beijing

The main intentions of this thesis are to analyse and explain changes in the function and graphic components of Beijing s wayfinding systems and to explain how the systems construct multiple cultural and political identities at different historical periods and in changing local/global contexts. In the thesis, the oversimplified one-way theory of the global-local dichotomy, in which the global power of the West is overwhelming and constantly dominant, and the local system of non-Western countries is passive and fragile, is challenged. Instead, this thesis seeks to examine the interactivity and correlation of the local and the global from two perspectives: mobility and reversibility. Looking at mobility is to consider the local and global and their nexus as different interconnections and networks that are constantly and unevenly changing. Reversibility, with which this thesis is most concerned, deals primarily with the reversible relationship of the local and global, namely, that either the local or the global can be dominant. This point is well illustrated by the evolution of Beijing s graphic wayfinding systems function and appearance. Beijing, as the capital of China, has undergone a radical transformation from the fall of the last Empire Qing (1912) to the establishment of the People s Republic of China (1949). The meaning of Beijing varies in accordance with the changes in its political and social structures. There have been five phases in Beijing s development: a well-planned imperial city; a capital city with a republican spirit; a totally industrialised but relatively isolated capital of a socialist country; an open and modernised Chinese-style socialist city; and a cosmopolitan city. In the course of this metamorphosis, what took place was a series of collisions, exchanges, fusions, and re-collisions between local power and global power. Along with the immense changes in Beijing, the role and appearance of the graphic wayfinding systems have also changed, especially those of road signs and doorplates, whose roles have been transformed from that of initial household register to orientation reference, to effective propaganda tool, and then on to the regeneration of a city. Finally, Beijing s graphic wayfinding design within its urban development has been reconfirmed as a useful instrument to support the new forms of visual narratives and consolidate the city brand of Beijing in the 21st century. This study probes into the political and cultural significances behind the changes of the graphic wayfinding systems of Beijing, as well as the interaction between the local and the global as reflected in the formation of these findings. The mutable and reversible relationship between the local and the global is illustrated and clarified through analysis and comparison of various functions and visual elements between Beijing s present graphic wayfinding systems and its early wayfinding signs, as well as decoding the different mainstream political or cultural ideologies that have deeply affected the function and design of Beijing graphic wayfinding systems at different periods

A Font Search Engine for Large Font Databases

A search engine for font recognition is presented and evaluated. The intended usage is the search in very large font databases. The input to the search engine is an image of a text line, and the output is the name of the font used when rendering the text. After pre-processing and segmentation of the input image, a local approach is used, where features are calculated for individual characters. The method is based on eigenimages calculated from edge filtered character images, which enables compact feature vectors that can be computed rapidly. In this study the database contains 2763 different fonts for the English alphabet. To resemble a real life situation, the proposed method is evaluated with printed and scanned text lines and character images. Our evaluation shows that for 99.1% of the queries, the correct font name can be found within the five best matches

Understanding the Problems of the Support of an Endangered Language in Typography: Proposal of a Typeface That Supports the Laz Language

This project addresses the diacritic-based literary problems of the endangered Laz language and has aimed to design a typeface that supports non-Unicode letters in Lazoglu alphabet. In the first part of this project, language erosion has been examined by taking into account the ‘The Atlas of the World’s Language in Danger’ document published by Unesco. On the following part, reference is made to the relation between language and writing, and the evolution of writing and typography. In the third step, history of the Latin-based Laz alphabets is examined from the Soviet era to the formation process of the present Lazoglu Alphabet. The misuse of non-Unicode letters in the Lazoglu alphabet by literate Lazes has been analyzed with utilizing handwriting samples, existed typefaces and printed matters. The design process of the Helimisi typeface is detailed from the early sketches until the digitization of the glyphs with the Glyphs software. Firstly the diacritic alternatives have been designed by taking into account that the form and position of diacritics affect legibility as much as the main form components of the typeface. The project was terminated by making kerning and spacing adjustments after the uppercases, lowercases, punctuation marks and numbers were designed