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