Computer vision is a rapidly expanding area and it is becoming progressively easier for developers to make use of this field due to the ready availability of high quality libraries (such as opencv 2). this text is intended to facilitate the practical use of computer vision with the goal being to bridge the gap between the theory and the practical implementation of computer vision. the book will explain how to use the relevant opencv library routines and will be accompanied by a full working program including the code snippets from the text. this textbook is a heavily illustrated, practical introduction to an exciting field, the applications of which are becoming almost ubiquitous. we are now surrounded by cameras, for example cameras on computers cameras built into our mobile phones/ cameras in games consoles; cameras imaging difficult modalities (such as ultrasound, x-ray, mri) in hospitals, and surveillance cameras.