Qt 5 and OpenCV 4 Computer Vision Projects电子书

Title Page

Copyright and Credits

Qt 5 and OpenCV 4 Computer Vision Projects

Dedication

About Packt

Why subscribe?

Contributors

About the author

About the reviewer

Packt is searching for authors like you

Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

Download the color images

Code in Action

Conventions used

Get in touch

Reviews

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

The Exit action

Opening an image

Zooming in and out

Saving a copy

Navigating in the folder

Responding to hotkeys

Summary

Questions

Editing Images Like a Pro

Technical requirements

The ImageEditor application

Blurring images using OpenCV

Adding the blur action

Building and installing OpenCV from the source

Blurring images

QPixmap, QImage, and Mat

QPixmap

QImage

Mat

Adding features using Qt's plugin mechanism

The plugin interface

Eroding images with ErodePlugin

Loading the plugin into our application

Editing images like a pro

Sharpening images

Cartoon effect

Rotating images

Affine transformation

Summary

Questions

Home Security Applications

Technical requirements

The Gazer application

Starting the project and setting up the UI

Accessing cameras

Listing cameras with Qt

Capturing and playing

Threading and the performance of real-time video processing

Capturing and playing with Qt

Calculating the FPS

Saving videos

Motion analysis with OpenCV

Motion detection with OpenCV

Sending notifications to our mobile phone

Summary

Questions

Fun with Faces

Technical requirements

The Facetious application

From Gazer to Facetious

Taking photos

Detecting faces using cascade classifiers

Detecting facial landmarks

Applying masks to faces

Loading images with the Qt resource system

Drawing masks on the faces

Selecting masks on the UI

Summary

Questions

Optical Character Recognition

Technical requirements

Creating Literacy

Designing the UI

Setting up the UI

OCR with Tesseract

Building Tesseract from the source

Recognizing characters in Literacy

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

The no-entry traffic sign

The faces of Boston Bulls

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

Measuring the distance between cars in a bird's eye view

Measuring the distance between a car and the camera in the eye-level view

Switching between view modes

Summary

Questions

Using OpenGL for the High-Speed Filtering of Images

Technical requirements

Hello OpenGL

OpenGL in Qt

Filtering images with OpenGL

Drawing images with OpenGL

Filtering images in the fragment shader

Saving the filtered images

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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