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Computer Vision with OpenCV 3 and Qt5

You're reading from   Computer Vision with OpenCV 3 and Qt5 Build visually appealing, multithreaded, cross-platform computer vision applications

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Product type Paperback
Published in Jan 2018
Publisher Packt
ISBN-13 9781788472395
Length 486 pages
Edition 1st Edition
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Author (1):
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Amin Ahmadi Tazehkandi Amin Ahmadi Tazehkandi
Author Profile Icon Amin Ahmadi Tazehkandi
Amin Ahmadi Tazehkandi
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Table of Contents (14) Chapters Close

Preface 1. Introduction to OpenCV and Qt 2. Creating Our First Qt and OpenCV Project FREE CHAPTER 3. Creating a Comprehensive Qt+OpenCV Project 4. Mat and QImage 5. The Graphics View Framework 6. Image Processing in OpenCV 7. Features and Descriptors 8. Multithreading 9. Video Analysis 10. Debugging and Testing 11. Linking and Deployment 12. Qt Quick Applications 13. Other Books You May Enjoy

The Items, QGraphicsItem

This is the base class of all items drawn on the scene. It contains various methods and properties to deal with drawing each item, collision detection (with other items), handling mouse clicks and other events, and much more. Even though you can subclass it and create your own graphical items, Qt provides a set of subclasses too, which can be used for most (if not all) of the daily graphical tasks. Here are those subclasses, some of which we already used in the previous examples, directly or indirectly:

  • QGraphicsEllipseItem
  • QGraphicsLineItem
  • QGraphicsPathItem
  • QGraphicsPixmapItem
  • QGraphicsPolygonItem
  • QGraphicsRectItem
  • QGraphicsSimpleTextItem
  • QGraphicsTextItem

As it was previously mentioned, QGraphicsItem provides numerous functions and properties to deal with the problems and tasks in a graphical application. In this section, we'll go through some...

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