比较实用的5个matlab代码：图像反转，灰度线性变换，非线性变换，直方图均衡化， 线性平滑滤波器-More practical 5 matlab code: Image is reversed, gray linear transformation, a nonlinear transformation, histogram equalization, linear smoothing filter

用 Matlab 程序实现图像求反： 程序实现线性灰度变换的图像增强： -use Matlab Matlab Program to achieve image negated: Procedures for linear gray transform image enhancement