Advice to create GUI for OpenCV app

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Qt is a good choice if you don't want to use c#.It is an open source project, support multiple major platforms--windows, mac, linux, ios, android, blackberry and so on.

There are many versions of Qt on the download page, I would explain the windows versions at here.

There are three compilers prebuild binaries of Qt

• mingw
• vc2010
• vc2012

vc2012 and vc2010 support openGL and angle, angle is an open source project to map OpenGL ES 2.0 API calls to DirectX 9 API.openGL is needed by QtQuick2(another way to describe gui);If you prefer the openGL version, you may need to upgrade your graphic cards driver for better openGL support, else the gui describe by QtQuick2 may not function properly, besides, some graphics cards do not have decent openGL support, if you want to make sure your gui could port to most of the desktops, don't use QtQuick2.

The other point you need to know is how to convert the QImage(one of the image container provided by Qt) and cv::Mat properly.

conversion between QImage and cv::Mat

angle or opengl

QtQuick

Look at the answer posted here: "http://answers.opencv.org/question/22564/how-to-do-opencv-in-windows-application/#22579" it gives an example for combining winforms and OpenCV.

Another option is to use Qt. However, you first need to build OpenCV with Qt support. This requires 3 steps: 1. build Qt from source. 2. configure OpenCV with QT support (see the answer given here for these 2 steps: http://answers.opencv.org/question/22816/how-to-set-the-path-to-qt5-in-cmake/#22817), and 3. build OpenCV (this is pretty standard, just build the solution generated with Cmake (see step 2)).

A nice step-by-step tutorial for creating a GUI application using OpenCV with Qt support is given here: http://www.youtube.com/watch?v=0ONxIy8itRA