External Labeling: Fundamental Concepts and Algorithmic Techniques
- Length: 130 pages
- Edition: 1
- Language: English
- Publisher: Morgan & Claypool
- Publication Date: 2021-07-22
- ISBN-10: 1636392040
- ISBN-13: 9781636392042
- Sales Rank: #0 (See Top 100 Books)
This book focuses on techniques for automating the procedure of creating external labelings, also known as callout labelings. In this labeling type, the features within an illustration are connected by thin leader lines (called leaders) with their labels, which are placed in the empty space surrounding the image.
In general, textual labels describing graphical features in maps, technical illustrations (such as assembly instructions or cutaway illustrations), or anatomy drawings are an important aspect of visualization that convey information on the objects of the visualization and help the reader understand what is being displayed.
Most labeling techniques can be classified into two main categories depending on the distance of the labels to their associated features. Internal labels are placed inside or in the direct neighborhood of features, while external labels, which form the topic of this book, are placed in the margins outside the illustration, where they do not occlude the illustration itself. Both approaches form well-studied topics in diverse areas of computer science with several important milestones.
The goal of this book is twofold. The first is to serve as an entry point for the interested reader who wants to get familiar with the basic concepts of external labeling, as it introduces a unified and extensible taxonomy of labeling models suitable for a wide range of applications. The second is to serve as a point of reference for more experienced people in the field, as it brings forth a comprehensive overview of a wide range of approaches to produce external labelings that are efficient either in terms of different algorithmic optimization criteria or in terms of their usability in specific application domains. The book mostly concentrates on algorithmic aspects of external labeling, but it also presents various visual aspects that affect the aesthetic quality and usability of external labeling.
Preface Acknowledgments Figure Credits Introduction External Labeling in Applications Book Structure How to Read This Book A Unified Taxonomy Terminology and Concepts Distinctive Features Admissible Positions of Labels Leader Type Static or Dynamic Labeling Optimization Problem Visual Aspects of External Labeling Style Placement Empirical Studies Labeling Techniques Non-Exact Algorithms Greedy Algorithms Force-Based Algorithms Miscellaneous Techniques Exact Algorithms Dynamic Programming Weighted Matching Scheduling Plane Sweep Mathematical Programming Complexity Results Guidelines External Labelings with Straight-Line Leaders Overview Detailed Discussion Contour Labeling Free Label Placement Non-Strict External Labeling Guidelines External Labelings with Polyline Leaders Overview Detailed Discussion po-Leaders opo-Leaders do- and pd-Leaders Other Polyline Leaders Curved Leaders Guidelines Conclusions and Outlook Bibliography Authors' Biographies Index Blank Page
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