计算单通道图像直方图
....................\Debug
....................\.....\rotate.bsc
....................\.....\rotate.exe
....................\.....\rotate.ilk
....................\.....\rotate.obj
....................\.....\rotate.pch
....................\.....\rotate.pdb
....................\.....\rotate.sbr
....................\.....\vc60.idb
....................\.....\vc60.pdb
....................\lena.jpg
....................\Makefile
....................\rotate.cpp
....................\rotate.dsp
....................\rotate.dsw
....................\rotate.ncb
....................\rotate.opt
....................\rotate.plg