This book discusses the use of image based neural networks for detecting and locating faces in colour images with complex backgrounds. This book is intended to act as an introduction to the area of face detection and as useful information about the best techniques used to develop a system that can duplicate human vision and how systems in general are implemented at present to find a face in an image. We believe that undergraduate University students seeking to work on a similar project for coursework or perhaps a final year dissertation may find this book useful. An image based neural network technique along with relevant code is presented in this book to demonstrate the implementation of a face detection algorithm. This face detection algorithm employs a normalisation routine to be used on training and test images and a bootstrapping algorithm to aid in the machine learning process.