图像添加Beta分布噪声

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Beta分布函数：

clc,clear,close allwarning offfeature jit offim = imread('coloredChips.png');Z1 = imnoise_Beta(size(im,1),size(im,2),5,2);Z1 = im2uint8(Z1);   % 类型转换figure('color',[1,1,1]),im(:,:,1) = im(:,:,1) + Z1;  % Rim(:,:,2) = im(:,:,2) + Z1;  % Gim(:,:,3) = im(:,:,3) + Z1;  % Bsubplot(121); imshow(im);title('加Beta分布噪声图像')subplot(122); imhist(Z1); title('加Beta分布噪声图像直方图')

function R = imnoise_Beta(M, N, a,b)% input:%       Beta分布，噪声的类型；%       M,N：输出噪声图像矩阵的大小%       a,b：各种噪声的分布参数% output:%       R: 输出的噪声图像矩阵，数据类型为double型% 设定默认值if nargin < 4   a = 1;b = 1;end   % 产生Beta分布噪声   for i=1:M       for j=1:N           x=rand;           R(i,j) = gam(a+b)./(gam(a).*gam(b)) .* (1-x).^(b-1).*x.^(a-1);       end   endendfunction T = gam(z)umax= 10;T=0;for i =0:1:umax    T =T + i^(z-1)*exp(-i);endend

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