Technical requirements

Users are required to have the ImageViewer application, which we built in the previous chapter, running correctly. Our development in this chapter will be based on that application.

Also, some basic knowledge of OpenCV is required as a prerequisite. We will be using the latest version of OpenCV, that is, version 4.0, which was released in December 2018, when this book was being written. Since the new version is not yet included in the software repositories of many operator systems, such as Debian, Ubuntu, or Fedora, we will build it from the source. Please don't worry about this—we will cover the installation instructions briefly, later in this chapter.

All of the code for this chapter can be found in this book's GitHub repository at https://github.com/PacktPublishing/Qt-5-and-OpenCV-4-Computer-Vision-Projects/tree/master/Chapter-02.

Check out the following video to see the code in action: http://bit.ly/2FhYLro