I myself make a bmp file for 24-bit true color to 256 gray-scale and binary procedures and sobel algorithm can be used to identify object boundaries.

bmpstart v1
...........\bmpstart
...........\........\alloc.h
...........\........\bmp.h
...........\........\bmpmain.cpp
...........\........\bmpstart.vcproj
...........\........\bmpstart.vcproj.RICHARDLAB04.RichardLab.user
...........\........\Debug
...........\........\.....\bmpmain.obj
...........\........\.....\bmpstart.exe.intermediate.manifest
...........\........\.....\BuildLog.htm
...........\........\.....\mt.dep
...........\........\.....\vc80.idb
...........\........\.....\vc80.pdb
...........\bmpstart.ncb
...........\bmpstart.sln
...........\bmpstart.zip
...........\debug
...........\.....\bmpstart.exe
...........\.....\bmpstart.ilk
...........\.....\bmpstart.pdb
...........\v1.doc

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