The purpose of this book is to provide an overview of basic image fusion techniques and an introduction to image fusion applications in variant fields. It is anticipated that this book will be useful for research scientists to capture recent developments and to spark new ideas in image fusion domain. This book emphasizes both basic concepts and advanced applications of image fusion. There are 12 chapters in this book. The first chapter gives a survey of image fusion techniques. A wavelet-based image fusion is then introduced in Chapter 2. The color image fusions are presented in next two chapters. A 3D fusion is proposed in Chapter 5. The following chapters are the exhibitions of application-orientated image fusions, which cover the areas of medical applications, remote sensing and GIS, material analysis, face detection, and plant water stress analysis. The editor would like to sincerely acknowledge the contributions from all chapter authors and their positive interactions to continuously improve the quality of this book. Special thanks are given to Davor Vidic and other InTech staff for their editorial assistance in publishing this book.Chapter 1 Survey of Multispectral Image Fusion Techniques in Remote Sensing Applications Chapter 2 Image Fusion Based on Integer Lifting Wavelet Transform Chapter 3 An Exploration of Color Fusion with Multispectral Images for Night Vision Enhancement Chapter 4 Image Fusion Based on Color Transfer Technique Chapter 5 3D Fusion of Stereo and Spectral Series Acquired with Camera Arrays Chapter 6 Medical Image Fusion Schemes Using Contourlet Transform and PCA Bases Chapter 7 Detecting Coronary Layers in IVUS Pictures Using Image Fusion Approach Chapter 8 Fusion of Multisource Images for Update of Urban GIS Chapter 9 Image Fusion for Remote Sensing Applications Chapter 10 Multitechnique Fusion of Imaging Data for Heterogeneous Materials Chapter 11 A Directional-Edge-Based Face Detection Algorithm Adapted to the VLSI Image Recognition System Chapter 12 Automatic Optical and Infrared Image Registration for Plant Water Stress Sensing