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)

Filtering images with OpenGL

So far, we have learned how to draw a simple triangle in OpenGL. In this section, we will learn how to draw images and filter them with OpenGL.

We will do this work in a copy of the QtGL project, that is, a new project named GLFilter. The creation of the project simply involves straightforward copying and a little bit of renaming, just as we did in the previous chapters. I won't repeat it again here, so please copy it by yourself.

Drawing images with OpenGL

In order to draw an image on the OpenGL viewport, we should introduce another concept of OpenGL—the texture. A texture in OpenGL is usually a 2D image, and it is generally used to add visual detail to an object, which is mainly a...