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This error tell you that Windows can find the DLL (here libopencv_highgui300.dll), but there is some functions missing in this DLL (transform_reset()). So I think the DLL was build with a different version of OpenCV than cpp_exemple_convexhull.exe. Maybe you unchecked "build example" in CMake? I suggest you to delete the folder C:/Qt/OPENCV_BUILD/install, rebuild the solution, and try again...
