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Visual Media Processing Using MATLAB Beginner's Guide

Visual Media Processing Using MATLAB Beginner's Guide

By : George Siogkas
4.5 (2)
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Visual Media Processing Using MATLAB Beginner's Guide

Visual Media Processing Using MATLAB Beginner's Guide

4.5 (2)
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 (13 chapters)
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12
Index

The basics of convolution


The process described previously was performed in overlapping neighborhoods of the image, but no use of a kernel was mentioned. So, what is this all about? And how does the convolution fit in this framework? Well, the truth is that the process described previously is actually describing the essence of convolution, which is passing a kernel over all possible equally sized neighborhoods of the image and using it to modify the value of the central pixel. The only problem in our case is that we did not use a specific kernel in the process described. Or did we? Let's try to find out using MATLAB code to perform two-dimensional convolution.

The 3x3 neighborhood we used for the described process can be replaced by a 3x3 kernel, as long as the final result remains the same. The kernel that accomplishes this effect is a 3x3 matrix with all pixels set to 1/9. Convolving this kernel with the original image produces the same result as the aforementioned example. To demonstrate...

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Visual Media Processing Using MATLAB Beginner's Guide
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