Book Image

Computer Vision with OpenCV 3 and Qt5

By : Amin Ahmadi Tazehkandi
4 (1)
Book Image

Computer Vision with OpenCV 3 and Qt5

4 (1)
By: Amin Ahmadi Tazehkandi

Overview of this book

Developers have been using OpenCV library to develop computer vision applications for a long time. However, they now need a more effective tool to get the job done and in a much better and modern way. Qt is one of the major frameworks available for this task at the moment. This book will teach you to develop applications with the combination of OpenCV 3 and Qt5, and how to create cross-platform computer vision applications. We’ll begin by introducing Qt, its IDE, and its SDK. Next you’ll learn how to use the OpenCV API to integrate both tools, and see how to configure Qt to use OpenCV. You’ll go on to build a full-fledged computer vision application throughout the book. Later, you’ll create a stunning UI application using the Qt widgets technology, where you’ll display the images after they are processed in an efficient way. At the end of the book, you’ll learn how to convert OpenCV Mat to Qt QImage. You’ll also see how to efficiently process images to filter them, transform them, detect or track objects as well as analyze video. You’ll become better at developing OpenCV applications.
Table of Contents (19 chapters)
Title Page
Dedication
Packt Upsell
Foreword
Contributors
Preface

Chapter 7. Features and Descriptors

In Chapter 6, Image Processing in OpenCV, we learned about image processing mostly in terms of the image content and pixels. We learned how to filter them, transform them, or play around with the pixel values in one way or another. Even to match a template, we simply used the raw pixel contents to get a result and find out if an object exists in part of an image or not. However, we still haven't learned about the algorithms that allow us to differentiate between objects of a different kind, not just based on their raw pixels, but also the collective meaning of an image based on its specific features. It is almost a trivial task for a human being to identify and recognize different types of faces, cars, written words, and almost any visible and visual object, given that they are not extremely similar. For us human beings, this happens in most cases without us even thinking about it. We can differentiate even between very similar faces, based on small and...