Opencv of the ROI & image mixing routines, using C++, can be run directly use.

OpenCVdemo2\OpenCVdemo2\dota_logo.jpg
...........\...........\dota_pa.jpg
...........\...........\main.cpp
...........\...........\mogu.jpg
...........\...........\OpenCVdemo2.vcxproj
...........\...........\OpenCVdemo2.vcxproj.filters
...........\...........\OpenCVdemo2.vcxproj.user
...........\...........\rain.jpg
...........\OpenCVdemo2.sln
...........\OpenCVdemo2.suo
...........\Release\dota_logo.jpg
...........\.......\dota_pa.jpg
...........\.......\mogu.jpg
...........\.......\OpenCVdemo2 by浅墨.exe
...........\.......\opencv_core248.dll
...........\.......\opencv_highgui248.dll
...........\.......\opencv_imgproc248.dll
...........\.......\rain.jpg
...........\OpenCVdemo2
...........\Release
OpenCVdemo2

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