图象处理大作业
王婷
180210305
二、实验工具：matlab2019b，pycharm-opencv
三、实验过程及结论
1. 图象的输入、显示与输出
%% read,display & write into image
img = imread('lena.tiff');
img_write = img-100;
montage({img,img_write},'size',[1 2]);
imwrite(img_write,'imgwrite.tiff')
图表 1 要求一：图象显示
2. 生成噪声：0 均值，3-5 个档次的方差
%% generate noise--gauss white noise
%%服从正态分布的一种白噪声
img = imread('lena.tiff');
noise1 = 2*randn(size(img));%var = 4
noise2 = 4*randn(size(img));%var = 16
noise3 = 7*randn(size(img));%var = 49
noise4 = 10*randn(size(img));%var = 100
var(noise1(:))
var(noise2(:))
var(noise3(:))
var(noise4(:))
montage({noise1,noise2,noise3,noise4},'size',[1 4])
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