Matlab 实现图像分割

2023-03-09
山东
本文字数：1654 字
阅读完需：约 5 分钟

文章和代码以及样例图片等相关资源，已经归档至【Github 仓库：digital-image-processing-matlab】或者公众号【AIShareLab】回复 数字图像处理 也可获取。

目的

掌握线检测
边缘检测
使用梯度的分水岭分割
控制标记符的分水岭分割

内容

线检测

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%function B=pixeldup(A, m, n)

if nargin<2;    error('At least two inputs are required');endif nargin==2;    n=m;endu=1:size(A,1);m=round(m);u=u(ones(1,m), :);u=u(:);


v = 1:size(A,1);n=round(n);v=v(ones(1,n), :);v=v(:);B=A(u,v);%%%%%%%%%%%%%%%%%%%%%%%%%%%%clear allclcf=imread('D:\pic\DIP3E_CH10\Fig1005(a)(wirebond_mask).tif');figure,imshow(f);
w=[2 -1 -1;-1 2 -1;-1 -1 2];g=imfilter(double(f),w);figure,imshow(g,[])%fig 2
gtop=g(1:120,1:120);gtop=pixeldup(gtop, 4);figure,imshow(gtop,[])%fig 3
gbot=g(end-119:end,end-119:end);gbot=pixeldup(gbot,4);figure,imshow(gbot,[])%fig 4
g=abs(g);figure,imshow(g,[])%fig 5
T=max(g(:));g=g>=T;figure,imshow(g)%fig 6%%%%%%%%%%%%%%%%%%%%%%%%

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边缘检测

%%%%%%%%%%%%%%%%%%%%%%%%%%%clear allclcf=imread('D:\pic\DIP3E_CH10\Fig1016(a)(building_original).tif');figure,imshow(f);[gv,t]=edge(f,'sobel','vertical');figure,imshow(gv);t
gv=edge(f,'sobel',0.15,'vertical');figure,imshow(gv);gboth=edge(f,'sobel',0.15);figure,imshow(gboth);w45=[-2 -1 0;-1 0 1;0 1 2]g45=imfilter(double(f),w45,'replicate');T=0.3*max(abs(g45(:)));g45=g45>=T;figure,imshow(g45);%%%%%%%%%%%%%%%%%%%%%%%%%Sobel，LoG 和Canny 边缘检测器的比较
clear allclcf=imread('D:\pic\DIP3E_CH10\Fig1016(a)(building_original).tif');figure,imshow(f);
[g_sobel_default,ts]=edge(f,'sobel');figure,imshow(g_sobel_default);[g_log_default,tlog]=edge(f,'log');figure,imshow(g_log_default);[g_canny_default,tc]=edge(f,'canny');figure,imshow(g_canny_default);
[g_sobel_best,ts]=edge(f,'sobel',0.05);figure,imshow(g_sobel_best);[g_log_best,tlog]=edge(f,'log',0.003,2.25);figure,imshow(g_log_best);[g_canny_best,tc]=edge(f,'canny',[0.04 0.10],1.5);figure,imshow(g_canny_best);

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使用梯度的分水岭分割

clear allclcf=imread('D:\pic\DIP3E_CH10\Fig1057(a)(small_blobs-original).tif');figure,imshow(f);
h=fspecial('sobel');fd=double(f);g=sqrt(imfilter(fd,h,'replicate').^2+...    imfilter(fd,h','replicate').^2);figure,imshow(g);
L=watershed(g);figure,imshow(L);wr=L==0;
g2=imclose(imopen(g,ones(3,3)),ones(3,3));figure,imshow(g2);L2=watershed(g2);figure,imshow(L2);wr2=L2==0;f2=f;f2(wr2)=255;figure,imshow(f2);

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控制标记符的分水岭分割

%%%%%%%%%%%%%%%%理解每幅图像的含义%%%%%%%%%%%clear allclcf=imread('D:\pic\DIP3E_CH10\Fig1057(a)(small_blobs-original).tif');figure,imshow(f);
h=fspecial('sobel');fd=double(f);g=sqrt(imfilter(fd,h,'replicate').^2+...imfilter(fd,h','replicate').^2);L=watershed(g);wr=L==0;
rm=imregionalmin(g);figure,imshow(rm);im=imextendedmin(f,2);figure,imshow(im);fim=f;fim(im)=175;figure,imshow(fim);
Lim=watershed(bwdist(im));figure,imshow(Lim);em=Lim==0;
g2=imimposemin(g,im|em);figure,imshow(g2);
L2=watershed(g2);figure,imshow(L2);f2=f;f2(L2==0)=255;figure,imshow(f2);