利用函数imnoise2处理噪声污染和spfilt处理滤波器

f=imread('0505.tif');
subplot(3,2,1),imshow(f)

[M,N]=size(f);%M和N分别显示图像f的行数和列数
 R=imnoise2('salt & pepper',M,N,0.1,0);%概率为0.1的胡椒污染图像
 c=find(R==0);%寻找R=0,并赋值为255
 gp=f;
 gp(c)=255;
 subplot(3,2,2),imshow(gp)
 
 R=imnoise2('salt & pepper',M,N,0,0.1);%盐粒污染图像
 c=find(R==1);%寻找R=1,并赋值为255
 gs=f;
 gs(c)=255;
 subplot(3,2,3),imshow(gs)
 
 fp=spfilt(gp,'amean',3,3);%使用算术平均滤波器得到的图像
 subplot(3,2,4),imshow(fp)
 
 fpmax=spfilt(gp,'max',3,3);%使用最大滤波器得到的图像
 subplot(3,2,5),imshow(fpmax)
 
 fpmin=spfilt(gs,'min',3,3);%使用最小滤波器得到的图像
 subplot(3,2,6),imshow(fpmin)
function R = imnoise2(type, varargin) %IMNOISE2 Generates an array of random numbers with specified PDF. % R = IMNOISE2(TYPE, M, N, A, B) generates an array, R, of size % M-by-N, whose elements are random numbers of the specified TYPE % with parameters A and B. If only TYPE is included in the % input argument list, a single random number of the specified % TYPE and default parameters shown below is generated. If only % TYPE, M, and N are provided, the default parameters shown below % are used. If M = N = 1, IMNOISE2 generates a single random % number of the specified TYPE and parameters A and B. % % Valid values for TYPE and parameters A and B are: % % 'uniform' Uniform random numbers in the interval (A, B). % The default values are (0, 1). % 'gaussian' Gaussian random numbers with mean A and standard % deviation B. The default values are A = 0, B = 1. % 'salt & pepper' Salt and pepper numbers of amplitude 0 with % probability Pa = A, and amplitude 1 with % probability Pb = B. The default values are Pa = % Pb = A = B = 0.05. Note that the noise has % values 0 (with probability Pa = A) and 1 (with % probability Pb = B), so scaling is necessary if % values other than 0 and 1 are required. The noise % matrix R is assigned three values. If R(x, y) = % 0, the noise at (x, y) is pepper (black). If % R(x, y) = 1, the noise at (x, y) is salt % (white). If R(x, y) = 0.5, there is no noise % assigned to coordinates (x, y). % 'lognormal' Lognormal numbers with offset A and shape % parameter B. The defaults are A = 1 and B = % 0.25. % 'rayleigh' Rayleigh noise with parameters A and B. The % default values are A = 0 and B = 1. % 'exponent
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