difference of gaussian and otsu algorithm in c/c

sobel+entropy+quality
.....................\Image_demo
.....................\..........\Histogram.txt
.....................\..........\Histogramofedge.txt
.....................\..........\Histoplot.txt
.....................\..........\Makefile
.....................\..........\Makefile~
.....................\..........\Readme.txt
.....................\..........\image_demo
.....................\..........\input_images
.....................\..........\............\Im1.jpg
.....................\..........\............\Im2.jpg
.....................\..........\............\Im3.jpg
.....................\..........\............\Image1.jpg
.....................\..........\............\Image2.jpg
.....................\..........\............\Image3.jpg
.....................\..........\............\Image4.jpg
.....................\..........\............\Karen.jpg
.....................\..........\............\building.jpg
.....................\..........\............\colours.png
.....................\..........\............\gear.jpg
.....................\..........\............\harewood.jpg
.....................\..........\............\lena.jpg
.....................\..........\............\lena.png
.....................\..........\............\lena_std.tif
.....................\..........\............\lenabw.jpg
.....................\..........\............\lenabw.png
.....................\..........\............\map.jpg
.....................\..........\............\map_field.jpg
.....................\..........\............\nett.jpeg
.....................\..........\............\other.jpeg
.....................\..........\............\test.jpg
.....................\..........\............\veggie1.jpg
.....................\..........\linear_stretching
.....................\..........\log.txt
.....................\..........\main.cpp
.....................\..........\main.cpp~
.....................\..........\main.o
.....................\..........\main2.cpp
.....................\..........\monaco.ttf
.....................\..........\sdl
.....................\..........\...\Makefile
.....................\..........\...\Makefile~
.....................\..........\...\main.cpp
.....................\..........\...\main.cpp~
.....................\..........\...\main.o
.....................\..........\...\sdl
.....................\..........\...\sdl.a
.....................\..........\...\sdl.cpp
.....................\..........\...\sdl.cpp~
.....................\..........\...\sdl.h
.....................\..........\...\sdl.h~
.....................\..........\...\sdl.o
.....................\..........\shrink_avrg.cpp

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