As we saw in the previous chapters, users are required to have at least Qt version 5 installed and have basic knowledge of C++ and Qt programming. Also, the latest version of OpenCV, 4.0, should be correctly installed. Additionally, besides the core and imgproc modules, the video and videoio modules of OpenCV will also be used in this chapter. If you have been through the previous chapters, then these requirements will have already been met.
We will use some pretrained machine learning models provided by OpenCV to detect faces and facial landmarks, so it is better if you have some basic knowledge of machine learning technology. Some of these machine learning models are from the extra modules of the OpenCV library, so the extra modules of OpenCV must also be installed along with the core modules. If you are not sure about this, don't worry, we will install...
