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Qt 5 and OpenCV 4 Computer Vision Projects

You're reading from   Qt 5 and OpenCV 4 Computer Vision Projects Get up to speed with cross-platform computer vision app development by building seven practical projects

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Product type Paperback
Published in Jun 2019
Publisher Packt
ISBN-13 9781789532586
Length 348 pages
Edition 1st Edition
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Author (1):
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Zhuo Qingliang Zhuo Qingliang
Author Profile Icon Zhuo Qingliang
Zhuo Qingliang
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Table of Contents (11) Chapters Close

Preface 1. Building an Image Viewer FREE CHAPTER 2. Editing Images Like a Pro 3. Home Security Applications 4. Fun with Faces 5. Optical Character Recognition 6. Object Detection in Real Time 7. Real-Time Car Detection and Distance Measurement 8. Using OpenGL for the High-Speed Filtering of Images 9. Assessments 10. Other Books You May Enjoy

Chapter 2, Editing Images Like a Pro

  1. How would we know whether an OpenCV function supports in-place operations?

As we mentioned in the chapter, we can refer to the official document pertaining to the function. If the document stipulates that it supports in-place operations, then it does, otherwise, it doesn't.

  1. How can a hotkey be added to each action we added as a plugin?

We can add a new method to the plugin interface class that returns a QList<QKeySequence> instance and implement it in the concrete plugin class. When we load the plugin, we call that method to get the shortcut key sequence and set it as the hotkey of the action for that plugin.

  1. How can a new action be added to discard all the changes in the current image in our application?

First of all, add a class field of the QPixmap type to the MainWindow class. Before editing the current image, we save a...

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