This book contains: Chapter 1 Introduction; Chapter 2 Visual feature extraction and discription, this chapter provides a deep overview of the basic feature extraction and description methods in the literature; Chapter 3 Machine lerning approaches for visual information retrieval. Chapter 4 Spatial and multi-resolution context in visual indexing; Chapter 5 Issues in visual information retrieval. This chapter is dedicated to these scalability issues. The nature of the problems both for content-based retrieval and for mining are described; Chapter 6 Evaluation of visual information indexing and retrieval. The chapter gives an overview of the major evaluation campaigns and benchmarks for visual indexing and retrieval tasks. //ir