怎样用matlab实现加入高斯噪声、椒盐噪声、脉冲噪声和乘性噪声，然后采取合适的滤波器进行去噪处理~~~~

可以使用下面这个函数添加噪声
imnoise
滤波的方法请查看参考资料

J = IMNOISE(I,TYPE,...) Add noise of a given TYPE to the intensity image
I. TYPE is a string that can have one of these values:

'gaussian' Gaussian white noise with constant
mean and variance

'localvar' Zero-mean Gaussian white noise
with an intensity-dependent variance

'poisson' Poisson noise

'salt & pepper' "On and Off" pixels

'speckle' Multiplicative noise

Depending on TYPE, you can specify additional parameters to IMNOISE. All
numerical parameters are normalized; they correspond to operations with
images with intensities ranging from 0 to 1.

更详细的可以查看帮助

祝你学习愉快！

椒盐？校验？