彩色图像处理
............\ex_12_1.m
............\ex_12_2.m
............\ex_12_3.m
............\ex_12_4.m
............\ex_12_5.m
............\ex_12_6.m
............\用到的图像
............\..........\autumn.tif
............\..........\board.tif
............\..........\coins.png
............\..........\peppers.png
............\..........\trees.tif