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三帧差法
........\1.avi
........\bkgrd.c
........\bkgrd.dsp
........\bkgrd.dsw
........\bkgrd.ncb
........\bkgrd.opt
........\bkgrd.plg
........\Debug
........\.....\bkgrd.exe
........\.....\bkgrd.ilk
........\.....\bkgrd.obj
........\.....\bkgrd.pch
........\.....\bkgrd.pdb
........\.....\ex01.obj
........\.....\lkdemo.obj
........\.....\vc60.idb
........\.....\vc60.pdb
........\Makefile