Why compile OpenCV with QT?

Question

I am using Qt and OpenCV in a new project, I am going to compile OpenCV to work with MinGW.

The thought came up that I could compile OpenCV libraries with Qt support, but I really don't understand why I would like to do this. If I do not compile Qs-enabled libs, I can still route cv::matin QImageusing a method like this .

So what am I missing? What value is provided when compiling Qt with OpenCV?

I searched online and pages such as this , this and this (from the search “why compile OpenCV with Qt”) will show only how to compile with Qt, and not why.

Answer 1

LE: misunderstood the question

The WITH_QT parameter is used by the highgui module to create windows using qt, so converting QImage to cv :: Mat and vice versa will work regardless of how the WITH_QT option is set.

First, some clarifications: you are not compiling OpenCV with Qt, Qt is not a compiler, so you cannot compile anything with it. Qt is a C ++ library (it is called frameworkbecause it imposes some some rules on the source code of your application, but basically it is a C ++ library, like OpenCV).

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