Add 09

Author: timerring

07_matlab_implements_image_compression.md

@@ -9,7 +9,6 @@
     - [离散余弦变换（DCT）图像压缩](#离散余弦变换dct图像压缩)
     - [利用离散余弦变换进行JPEG 图像压缩](#利用离散余弦变换进行jpeg-图像压缩)
 
-
 # Matlab实现图像压缩
 
 ## 目的

09_matlab_implements_image_segmentation.md

@@ -0,0 +1,196 @@
+- [Matlab实现图像分割](#matlab实现图像分割)
+  - [目的](#目的)
+  - [内容](#内容)
+    - [线检测](#线检测)
+    - [边缘检测](#边缘检测)
+    - [使用梯度的分水岭分割](#使用梯度的分水岭分割)
+    - [控制标记符的分水岭分割](#控制标记符的分水岭分割)
+
+
+# Matlab实现图像分割
+
+## 目的
+
+1. 掌握线检测
+
+2. 边缘检测
+
+3. 使用梯度的分水岭分割
+
+4. 控制标记符的分水岭分割
+
+## 内容
+
+### 线检测
+
+```matlab
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+function B=pixeldup(A, m, n)
+
+
+if nargin<2;
+    error('At least two inputs are required');
+end
+if nargin==2;
+    n=m;
+end
+u=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 all
+clc
+f=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
+%%%%%%%%%%%%%%%%%%%%%%%%
+```
+
+### 边缘检测
+
+```matlab
+%%%%%%%%%%%%%%%%%%%%%%%%%%%
+clear all
+clc
+f=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 all
+clc
+f=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);
+```
+
+### 使用梯度的分水岭分割
+
+```matlab
+clear all
+clc
+f=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);
+```
+
+### 控制标记符的分水岭分割
+
+```matlab
+%%%%%%%%%%%%%%%%理解每幅图像的含义%%%%%%%%%%%
+clear all
+clc
+f=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);
+```
+
+参考文献：
+
+[1] [Rafael C. Gonzalez, Richard E. Woods, and Steven L. Eddins. 2003. Digital Image Processing Using MATLAB. Prentice-Hall, Inc., USA.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_Using_Matlab.pdf)
+
+[2] [阮秋琦. 数字图像处理（MATLAB版）[M]. 北京：电子工业出版社, 2014.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_(MATLAB_version).pdf)
+
+[3] [冈萨雷斯. 数字图像处理（第三版）[M]. 北京：电子工业出版社, 2011.](https://github.com/timerring/digital-image-processing-matlab/blob/main/reference/Digital_Image_Processing_(Third_Edition).pdf)
+
+
+
+[返回首页](https://github.com/timerring/digital-image-processing-matlab)