加椒盐噪声，二维高斯低通滤波器，计算二维线性滤波-Add salt and pepper noise, Gaussian low-pass filter to calculate two-dimensional linear filtering

matlab code for decision based median filter.it can be used for salt and pepper noise reduction . in this the pixel values are processed based on a decision mechanism

中值滤波，去噪 实验原理：中值滤波器是将领域内像素灰度的中值代替该像素的值,对处理脉冲噪声(椒盐噪声)非常有效。为了对一幅图像上的某个点进行中值滤波处理，必须先将掩模内欲求的像素及其领域的像素值排序，确定出中值，主要功能是使拥有不同灰度的点看起来更接近于它的邻近值。-Median filtering and denoising Test principle: median filter is to field pixel gray value instead of the pixel v

he MATLAB function is prepared to achieve function, median filtering, median filtering can reserve the image detail, and good salt pepper noise removal.

In this project, Brain tumor in MRI is detected using image segmentation techniques. There are number of image segmentation techniques available but watershed segmentation is considered to be best among all. First of all prep-processing is to be done