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Table Of Contents

Qt 5 and OpenCV 4 Computer Vision Projects

By : Zhuo Qingliang

5 (1)

Buy this Book

Qt 5 and OpenCV 4 Computer Vision Projects

5 (1)

By: Zhuo Qingliang

Buy this Book

Overview of this book

OpenCV and Qt have proven to be a winning combination for developing cross-platform computer vision applications. By leveraging their power, you can create robust applications with both an intuitive graphical user interface (GUI) and high-performance capabilities. This book will help you learn through a variety of real-world projects on image processing, face and text recognition, object detection, and high-performance computing. You’ll be able to progressively build on your skills by working on projects of increasing complexity. You’ll begin by creating an image viewer application, building a user interface from scratch by adding menus, performing actions based on key-presses, and applying other functions. As you progress, the book will guide you through using OpenCV image processing and modification functions to edit an image with filters and transformation features. In addition to this, you’ll explore the complex motion analysis and facial landmark detection algorithms, which you can use to build security and face detection applications. Finally, you’ll learn to use pretrained deep learning models in OpenCV and GPUs to filter images quickly. By the end of this book, you will have learned how to effectively develop full-fledged computer vision applications with OpenCV and Qt.

Preface

Who this book is for

What this book covers

To get the most out of this book

Get in touch

Free Chapter

Building an Image Viewer

Technical requirements

Designing the user interface

Starting the project from scratch

Setting up the full user interface

Implementing the functions for the actions

Summary

Questions

Editing Images Like a Pro

Technical requirements

The ImageEditor application

Blurring images using OpenCV

Adding features using Qt's plugin mechanism

Editing images like a pro

Summary

Questions

Home Security Applications

Technical requirements

The Gazer application

Accessing cameras

Saving videos

Motion analysis with OpenCV

Summary

Questions

Fun with Faces

Technical requirements

The Facetious application

Detecting faces using cascade classifiers

Detecting facial landmarks

Applying masks to faces

Summary

Questions

Optical Character Recognition

Technical requirements

Creating Literacy

OCR with Tesseract

Detecting text areas with OpenCV

Recognizing characters on the screen

Summary

Questions

Object Detection in Real Time

Technical requirements

Detecting objects using OpenCV

Detecting objects using a cascade classifier

Training a cascade classifier

Detecting objects using deep learning models

About real time

Summary

Questions

Real-Time Car Detection and Distance Measurement

Technical requirements

Car detection in real time

Distance measurement

Measuring the distance between cars or between the car and the camera

Summary

Questions

Using OpenGL for the High-Speed Filtering of Images

Technical requirements

Hello OpenGL

OpenGL in Qt

Filtering images with OpenGL

Using OpenGL with OpenCV

Summary

Further reading

Assessments

Chapter 1, Building an Image Viewer

Chapter 2, Editing Images Like a Pro

Chapter 3, Home Security Applications

Chapter 4, Fun with Faces

Chapter 5, Optical Character Recognition

Chapter 6, Object Detection in Real Time

Chapter 7, Real-Time Car Detection and Distance Measurement

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There is a lot more to OpenGL than what we have covered in this chapter. Since we mainly focused on image processing in this book, we only showed how to use it to filter images. If you are interested in OpenGL, you can find more resources on its official website at https://www.opengl.org. There are also a number of awesome tutorials on the internet, for example, https://learnopengl.com and https://open.gl/.

If you are not so interested in OpenGL, which is mainly for 2D and 3D graphics development, but are interested in heterogeneous computing, then you can refer to OpenCL or CUDA. OpenCL is very similar to OpenGL; it is a specification maintained by the Khronos group. Additionally, the next generations of OpenGL and OpenCL are now consolidated into one specification named Vulkan, so Vulkan is also a good option to choose. CUDA is a proprietary solution for heterogeneous...

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