Book Image

Visual Media Processing Using MATLAB Beginner's Guide

By : George Siogkas
Book Image

Visual Media Processing Using MATLAB Beginner's Guide

By: George Siogkas

Overview of this book

Whether you want to enhance your holiday photographs or make a professional banner image for your website, you need a software tool that offers you quick and easy ways to accomplish it. All-in-one tools tend to be rare, and Matlab is one of the best available.This book is a practical guide full of step-by-step examples and exercises that will enable you to use Matlab as a powerful, complete, and versatile alternative to traditional image and video processing software.You will start off by learning the very basics of grayscale image manipulation in Matlab to master how to analyze 3-dimensional images and videos using the same tool. The methods you learn here are explained and expanded upon so that you gradually reach a more advanced level in Matlab image and video processing. You will be guided through the steps of opening, transforming, and saving images, later to be mixed with advanced masking techniques both in grayscale and in color. More advanced examples of artistic image processing are also provided, like creating panoramic photographs or HDR images. The second part of the book covers video processing techniques and guides you through the processes of creating time-lapse videos from still images, and acquiring, filtering, and saving videos in Matlab. You will learn how to use many useful functions and tools that transform Matlab from a scientific software to a powerful and complete solution for your everyday image and video processing needs.
Table of Contents (18 chapters)
Visual Media Processing Using MATLAB Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Applying geometric transformations


By now you have already mastered how to open an image and display it as it is using the Command Window. Now, it is time to learn how to apply basic geometric transformations to an image and display them along with the original. Geometric transformations are probably the most common functionalities of every image editor, no matter how basic it is. They do not generally alter the content of an image, but actually change the grid of pixels so that processes, such as image rotation or mirroring are achieved. Cropping and resizing of images are also two basic geometric transformations. In this section, we will see how all these transformations can be achieved in MATLAB.

Performing image rotation

For image rotation, you can use the function imrotate. Again, you will be working in the Command Window, where you will have to type the functions to perform the transformations. Only this time, we will use a few more lines of code, to display the results in a single window.