①线性灰度变换（函数形式）
② 编程计算图像的直方图，并与函数imhist比较
③ 执行直方图均衡化和规定化histeq
④ 给图像添加噪声
⑤ 执行均值滤波、高斯滤波和中值滤波
⑥ 执行拉普拉斯滤波
⑦ 执行低通滤波和高通滤波(Linear gray scale transformation (function form)
The histogram of the image is calculated and compared with the function imhist
Performing histogram equalization and normalized histeq
Add noise to the image
Performing mean filter, Gauss filter and median filter
Execution of Laplasse filter
Performing low pass filtering and high pass filtering)