图像的各向异性扩散——启发性方法

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clear all;close all;clc;k=15;           %导热系数,控制平滑lambda=0.15;    %控制平滑N=20;           %迭代次数img=double(imread('lena.jpg'));imshow(img,[]);[m n]=size(img);imgn=zeros(m,n);for i=1:N    for p=2:m-1        for q=2:n-1            %当前像素的散度，对四个方向分别求偏导，局部不同方向上的变化量，            %如果变化较多，就证明是边界，想方法保留边界            NI=img(p-1,q)-img(p,q);            SI=img(p+1,q)-img(p,q);            EI=img(p,q-1)-img(p,q);            WI=img(p,q+1)-img(p,q);                        %四个方向上的导热系数，该方向变化越大，求得的值越小，从而达到保留边界的目的            cN=exp(-NI^2/(k*k));            cS=exp(-SI^2/(k*k));            cE=exp(-EI^2/(k*k));            cW=exp(-WI^2/(k*k));                        imgn(p,q)=img(p,q)+lambda*(cN*NI+cS*SI+cE*EI+cW*WI);  %扩散后的新值              end    end        img=imgn;       %整个图像扩散完毕，用已扩散图像的重新扩散。endfigure;imshow(imgn,[]);clear all;close all;clc;k=15;        </span><br /><hr><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.2.1/css/bootstrap.min.css" integrity="sha512-siwe/oXMhSjGCwLn+scraPOWrJxHlUgMBMZXdPe2Tnk3I0x3ESCoLz7WZ5NTH6SZrywMY+PB1cjyqJ5jAluCOg==" crossorigin="anonymous" referrerpolicy="no-referrer" />
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