Shape from Positional-Contrast - Characterising Sketches with Qualitative Line Arrangements

Acknowledgements

Preface

Contents

List of Figures

List of Tables

Part I Introduction

1 Sketches

1.1 Necessary versus accidental properties

1.2 Perceptually aided distinctions

1.3 Methodological notes

1.4 Overview

2 The imprecision of sketches

2.1 Characterising sketches

2.2 Imprecise spatial information

2.3 Object of research

Part II Theory

3 Qualitative line arrangements

3.1 Bipartite arrangements

3.2 Disconnected arrangements

4 Characterising polygons qualitatively

4.1 Local orientation

4.2 Global orientation

4.3 Combining local and global orientation

Part III Evaluation

5 Applying qualitative line arrangements

5.1 The Bamberger wax apples

5.2 Method

5.3 A retrieval experiment

6 Positional-contrast

6.1 Ease of sketching

6.2 Geometrical classi.cation

6.3 Applications beyond sketching

Part IV Appendices

Appendix A Bertuch-collection

Appendix B Queries and reference sets

Bibliography