By calculating the area and perimeter of the image, and the image contrast, we can identify the meaning of image. Such as, enter a image like letter A, you can identify the letter A by comparison.

demo\demo.exe
....\learning\Debug\A.bmp
....\........\.....\B.bmp
....\........\.....\C.bmp
....\........\.....\D.bmp
....\........\.....\E.bmp
....\........\.....\F.bmp
....\........\.....\G.bmp
....\........\.....\GQ
....\........\.....\H.bmp
....\........\.....\I.bmp
....\........\.....\in.dat
....\........\.....\in.dat~
....\........\.....\J.bmp
....\........\.....\K.bmp
....\........\.....\L.bmp
....\........\.....\learning
....\........\.....\M.bmp
....\........\.....\main.o
....\........\.....\Makefile
....\........\.....\N.bmp
....\........\.....\O.bmp
....\........\.....\P.bmp
....\........\.....\Q.bmp
....\........\.....\R.bmp
....\........\.....\S.bmp
....\........\.....\T.bmp
....\........\.....\U.bmp
....\........\.....\V.bmp
....\........\.....\W.bmp
....\........\.....\X.bmp
....\........\.....\Y.bmp
....\........\.....\Z.bmp
....\........\Learning\learning.pro
....\........\........\learning.pro.user
....\........\........\main.cpp
....\........\Release\A.bmp
....\........\.......\GQ
....\........\.......\in.dat
....\........\.......\learning
....\........\.......\main.o
....\........\.......\Makefile
....\opencv_core231.dll
....\opencv_highgui231.dll
....\recognise\Debug\12345.bmp
....\.........\.....\B.bmp
....\.........\.....\C.bmp
....\.........\.....\D.bmp
....\.........\.....\E.bmp
....\.........\.....\F.bmp
....\.........\.....\G.bmp
....\.........\.....\H.bmp
....\.........\.....\I.bmp
....\.........\.....\in.dat
....\.........\.....\J.bmp
....\.........\.....\K.bmp
....\.........\.....\L.bmp
....\.........\.....\M.bmp
....\.........\.....\main.o
....\.........\.....\Makefile
....\.........\.....\N.bmp
....\.........\.....\O.bmp
....\.........\.....\P.bmp
....\.........\.....\Q.bmp
....\.........\.....\R.bmp
....\.........\.....\recognise
....\.........\.....\S.bmp
....\.........\.....\T.bmp
....\.........\.....\U.bmp
....\.........\.....\V.bmp
....\.........\.....\W.bmp
....\.........\.....\X.bmp
....\.........\.....\Y.bmp
....\.........\.....\Z.bmp
....\.........\recognise\main.cpp
....\.........\.........\recognise.pro
....\.........\.........\recognise.pro.user
....\.........\Release\in.dat
....\.........\.......\main.o
....\.........\.......\Makefile
....\.........\.......\recognise
....\learning\Debug
....\........\Learning
....\........\Release
....\recognise\Debug
....\.........\recognise
....\.........\Release
....\learning
....\recognise
demo

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