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Packey BIRMIINGHAM- MUMBAI Computer vision with OpenCv 3 and Qt5 Copyright C 2018 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 Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing or its dealers and distributors, will be held liable for any damages caused or alleged to have been caused directly or indirectly by this book Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information Commissioning editor: Aaron lazar cquisition Editor: Parth Kothari Content Development Editor: Lawrence Veigas Technical Editor: Supriya thabe Copy Editor Zainab bootwala Project Coordinator: Prajakta Naik Proofreader Safis Editing Indexers: Rekha nair Graphics: Jason monteiro Production Coordinator: Nilesh Mohite First published: January 2018 Production reference: 1291217 Published by Packt Publishing Ltd Livery Place 35 Livery Street Birminghan B3 2PB. UK ISBN978-1-78847-239 This book is dedicated to the open source communities and you, the bright minded developers, working hard to build a better world forall ofus Mapt mapt. 10 Mapt is an online digital library that gives you full access to over 5,000 books and videos as well as industry leading tools to help you plan your personal development and advance your career. For more information, please visit our website Why subscribe? Spend less time learning and more time coding with practical eBooks and videos rom over 4,000 industry professionals Improve your learning with Skill Plans built espccially for you Get a free e Book or video every month Mapt is fully searchable Copy and paste, print, and bookmark content PacktPub. com Did you know that Packt offers e Book versions of every book published, with PdF and epubfilesavailableYoucanupgradetotheeBookversionatwww.Packtpub.comandasa print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@packtpub com for more details Atwww.packtPub.comyoucanalsoreadacollectionoffrectcchnicalarticlessignupfora range of free newsletters, and receive exclusive discounts and offers on Packt books and eBooks Foreword Around 20 years ago, when I was graduating from university, development of large and complex applications that included a graphical user interface was a time-consuming and difficult task. The APIs and tools that existed at that time to create those applications were difficult to use and understand. Creating applications for multiple platforms required writing a large part of it several times It was at that time that I discovered Qt, a framework that fixcd both of these problems. It came with an casy-to-use, intuitive API and worked across all major desktop opcrating systems. Suddenly, programming these applications went from being hard work to something I really enjoyed. I wasnt limited to one operating system anymore could have my application running on multiple operating systems with a simple recompile Since then, many things have improved for application developers. Frameworks have put a lot more effort into having easy-to-use APIs. The operating system landscape has changed, and having APls that are available cross-platform is more important than ever OpenCV has, over the last few years, evolved into the leading API for computer vision. It contains a large set of functionalities and algorithms that can be used for things such as face recognition, tracking camera or eye movements, track markers for augmented reality, and much more Qt has also, over the same period, turned into one of the leading cross-platform frameworks for application development. Its comprehensive feature set contains most of the functionality you will need to develop a complex graphical application Making Qt the best technology to create cross-platform applications has becn my mission for the last 17 ycars. One of the goals has always been to make it easy to combine Qt with other technologics. This book gives you a great example on how this can be done Both Qt and OpenCV feature cross-platform C++ APls, making it straightforward to use them together. By combining them, you will have a powerful set of tools at hand, making it easy to create applications that combine computer vision with a graphical user interface I hope that this book will help you on your way to becoming an expert in both Qt and Openc v Lars knoll Qt Chief Maintainer and CTO at The Qt Company Contributors

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