Android Application Programming with OpenCV

Table of Contents

Android Application Programming with OpenCV

Credits

About the Author

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. Setting Up OpenCV

System requirements

Setting up a development environment

Getting a ready-made development environment – Tegra Android Development Pack (TAPD)

Assembling a development environment piece-by-piece

Getting the prebuilt OpenCV4Android

Building OpenCV4Android from source

Building the OpenCV samples with Eclipse

Finding documentation and help

Summary

2. Working with Camera Frames

Designing our app – Second Sight

Creating the Eclipse project

Enabling camera and disk access in the manifest

Creating menu and string resources

Previewing and saving photos in CameraActivity

Deleting, editing, and sharing photos in LabActivity

Summary

3. Applying Image Effects

Adding files to the project

Defining the Filter interface

Mixing color channels

Making subtle color shifts with curves

Processing a neighborhood of pixels with convolution filters

Adding the filters to CameraActivity

Summary

4. Recognizing and Tracking Images

Adding files to the project

Understanding image tracking

Writing an image tracking filter

Adding the tracker filters to CameraActivity

Summary

5. Combining Image Tracking with 3D Rendering

Adding files to the project

Defining the ARFilter interface

Building projection matrices in CameraProjectionAdapter

Modifying ImageDetectionFilter for 3D tracking

Rendering the cube in ARCubeRenderer

Adding 3D tracking and rendering to CameraActivity

Learning more about 3D graphics on Android

Summary

Index

Android Application Programming with OpenCV

Android Application Programming with OpenCV

Copyright © 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

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First published: September 2013

Production Reference: 1180913

Published by Packt Publishing Ltd.

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Birmingham B3 2PB, UK.

ISBN 978-1-84969-520-6

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Cover Image by Ankita Jha (<[email protected]>)

Credits

Author

Joseph Howse

Reviewers

Karan Kedar Balkar

Rohit Bhat

Viral Parekh

Acquisition Editors

Nikhil Karkal

Kartikey Pandey

Commissioning Editor

Harsha Bharwani

Technical Editors

Jinesh Kampani

Manal Pednekar

Project Coordinator

Amigya Khurana

Proofreader

Amy Guest

Indexer

Rekha Nair

Graphics

Ronak Dhruv

Production Coordinator

Conidon Miranda

Cover Work

Conidon Miranda

About the Author

Joseph Howse might be at home right now, sitting on a sofa and writing a book, or he might have dashed away with a suitcase full of books, cameras, and computers. He is equipped to see the world or at least to do his work in computer vision.

He is a software developer at Ad-Dispatch (Canada), where he makes augmented reality games for iOS and Android. Thanks to computer vision, the games can make use of real-world props such as a child's drawings, toys, or blanket-forts.

He also provides training and consulting services. He is currently consulting at Market Beat (El Salvador) on an embedded systems project that uses OpenCV for face recognition.

He holds three masters degrees in Computer Science, International Development Studies, and Business Administration (Dalhousie University, Canada). His research has been published by ISMAR (International Symposium on Mixed and Augmented Realities), and he would love to meet you there if you go.

Android Application Programming with OpenCV is Joe's second book with Packt. His first book, OpenCV Computer Vision with Python, includes an introduction to face tracking and depth cameras (for example, Kinect) on Windows, Mac, and Linux.

Joe likes cats, kittens, oceans, and seas. Felines and saline water sustain him. He lives with his multi-species family in Halifax, on Canada's Atlantic coast.

I am able to write—and to enjoy writing—because I am constantly encouraged by the memory of Sam and by the companionship of Mom, Dad, and the cats. They are my fundamentals.

I am indebted to my editors and reviewers for guiding this book to completion. Their professionalism, courtesy, good judgment, and passion for books are much appreciated.

About the Reviewers

Karan Kedar Balkar has been working as an independent Android application developer since the past four years. Born and brought up in Mumbai, he holds a bachelor degree in Computer Engineering. He has written over 50 programming tutorials on his personal blog (http://karanbalkar.com), covering popular technologies and frameworks.

At present, he is working as a software engineer. He has been trained on various technologies including Java, Oracle, and .NET. Apart from being passionate about technology, he loves to write poems and travel to different places. He likes listening to music and enjoys playing the guitar.

Firstly, I would like to thank my parents for their constant support and encouragement. I would also like to thank my friends Srivatsan Iyer, Ajit Pillai, and Prasaanth Neelakandan for always inspiring and motivating me.

I would like to express my deepest gratitude to Packt Publishing for giving me a chance to be a part of the reviewing process.

Rohit Bhat is a Computer Science graduate from BITS Pilani, India, currently working as a Software Specialist in a leading Big Data Analytics firm. He has done projects in a variety of fields of technology encompassing Data Mining, Android Development, Open CV, Swarm Intelligence, Workflow Automation, and Video Conferencing platform. He loves to keep himself abreast of the latest technology and can always be found ready for a discussion on any topic under the sun. He is also interested in reading, startup, economics, and current affairs. He likes to write and is a freelance blogger in his spare time.

He is currently writing a book for Packt on Bonita Open Solution, a technology which he has used extensively for Workflow Automation and Business Process Modeling.

Viral Parekh is a young graduate of Computer Science. He is a skilled mobile application developer. He has a grip on the various open source libraries such as OpenCV, OpenNI (Open Natural Interaction), FFmpeg, and video4linux. He is keen to work in the field of Human computer Interaction and Augmented reality.

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Preface

This book will show you how to use OpenCV's Java bindings in an Android app that displays a camera feed, saves and shares photos, manipulates colors and edges, and tracks real-world objects in 2D or 3D. Integration with OpenGL is also introduced so that you can start building augmented reality (AR) apps that superimpose virtual 3D scenes on tracked objects in