Introduction

In the previous lesson, we introduced some of the core computational tools you will need on this course. In this lesson, we are going to start using those tools to understand the principles behind image processing. We will discuss two general classes of image processing in the form of spatial transformations and image filtering. Both of these types of processing involve the manipulation of voxel values, but generally they have different aims. Spatial transformations work to move the brain around in different spaces, whereas filtering involves changing the signal that underlies an image. Alongside these main topics, this lesson will introduce some key concepts that we will see in many different contexts throughout this course such as interpolation and convolution.

Contents

• What is Image Processing?
• Voxel-space and World-space
• Rigid-body Transformations
• Transforming Images
• Interpolation
• Image Filtering
• Summary

About the Author

Dr Martyn McFarquhar | PhD FHEA

Lecturer in Neuroimaging

4.31 Booth Street East Building | Division of Psychology, Communication and Human Neuroscience | School of Health Sciences | The University of Manchester M13 9PL

t: +44 (0)161 275 2688 | e: martyn.mcfarquhar@manchester.ac.uk