Book Image

Qt 5 and OpenCV 4 Computer Vision Projects

By : Zhuo Qingliang
4 (1)
Book Image

Qt 5 and OpenCV 4 Computer Vision Projects

4 (1)
By: Zhuo Qingliang

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.
Table of Contents (11 chapters)

Blurring images using OpenCV

In the preceding section, we set up our editor application. In this section, we will add a simple feature of image editing—an action (both on the menu and the toolbar) to blur the image.

We will do this in two steps:

  1. First, we will set up the UI and add the action, and then connect the action to a dummy slot.
  2. Then, we will rewrite the dummy slot to blur the image, which will get the OpenCV library involved.

Adding the blur action

Most of the actions we will add in this chapter will be used to edit an image, so we should categorize them in a new menu and toolbar. First, we will declare three members, that is, the edit menu, the edit toolbar, and the blur action, in the private section of...