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Author: timerring

11_common_image_processing_commands_in_Matlab_(1).md

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+- [Matlab常用图像处理命令108例（一）](#matlab常用图像处理命令108例一)
+  - [1.applylut](#1applylut)
+  - [2.bestblk](#2bestblk)
+  - [3.blkproc](#3blkproc)
+  - [4.brighten](#4brighten)
+  - [5.bwarea](#5bwarea)
+  - [6.bweuler](#6bweuler)
+  - [7.bwfill](#7bwfill)
+  - [8.bwlabel](#8bwlabel)
+  - [9.bwmorph](#9bwmorph)
+  - [10.bwperim](#10bwperim)
+
+
+# Matlab常用图像处理命令108例（一）
+
+## 1.applylut
+
+在二进制图像中利用lookup 表进行边沿操作。 
+
+语法： 
+
+```matlab
+A = applylut(BW,lut) 
+```
+
+举例
+
+```matlab
+lut = makelut('sum(x(:)) == 4',2); 
+
+BW1 = imread('text.tif'); 
+
+BW2 = applylut(BW1,lut); 
+
+imshow(BW1) 
+
+figure, imshow(BW2)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-08-57-55-1678496273.png)
+
+相关命令： makelut
+
+## 2.bestblk
+
+功能：确定进行块操作的块大小。 
+
+语法：
+
+```matlab
+siz = bestblk([m n],k) 
+
+[mb,nb] = bestblk([m n],k) 
+```
+
+举例 
+
+```matlab
+siz = bestblk([640 800],72) 
+
+siz = 64 50 
+```
+
+相关命令： Blkproc
+
+## 3.blkproc
+
+功能：实现图像的显式块操作。 
+
+语法： 
+
+```matlab
+B = blkproc(A,[m n],fun) 
+
+B = blkproc(A,[m n],fun,P1,P2,...)
+
+B = blkproc(A,[m n],[mborder nborder],fun,...)
+
+B = blkproc(A,'indexed',...)
+```
+
+举例
+
+```matlab
+I = imread('alumgrns.tif');
+
+I2 = blkproc(I,[8 8],'std2(x)*ones(size(x))');
+
+imshow(I)
+
+figure, imshow(I2,[]);
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-00-58-1678496456.png)
+
+相关命令：
+
+colfilt, nlfilter,inline
+
+## 4.brighten
+
+功能：增加或降低颜色映像表的亮度。
+
+语法：
+
+```matlab
+brighten(beta)
+newmap = brighten(beta)
+newmap = brighten(map,beta)
+brighten(fig,beta)
+```
+
+相关命令：
+
+imadjust, rgbplot
+
+## 5.bwarea
+
+功能：计算二进制图像对象的面积。
+
+语法：
+
+```matlab
+total = bwarea(BW)
+```
+
+举例
+
+```matlab
+BW = imread('circles.tif');
+imshow(BW);
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-02-37-1678496556.png)
+
+```matlab
+bwarea(BW) 
+
+ans = 
+
+15799 
+```
+
+相关命令： bweuler, bwperim
+
+## 6.bweuler
+
+功能：计算二进制图像的欧拉数。 
+
+语法： 
+
+```matlab
+eul = bweuler(BW,n) 
+```
+
+举例 
+
+```matlab
+BW = imread('circles.tif'); 
+
+imshow(BW); 
+
+bweuler(BW) 
+
+ans = –2 
+```
+
+相关命令： bwmorph, bwperim
+
+## 7.bwfill
+
+功能：填充二进制图像的背景色。
+
+语法：
+
+```matlab
+BW2
+= bwfill(BW1,c,r,n) BW2 =
+bwfill(BW1,n) [BW2,idx] = bwfill(...)
+
+BW2
+= bwfill(x,y,BW1,xi,yi,n) [x,y,BW2,idx,xi,yi]
+= bwfill(...) BW2 =
+bwfill(BW1,'holes',n) [BW2,idx] = bwfill(BW1,'holes',n)
+```
+
+举例
+
+```matlab
+BW1 =[1 0 0 0 0 0 0 0
+
+1 1 1 1 1 0 0 0
+
+1 0 0 0 1 0 1 0
+
+1 0 0 0 1 1 1 0
+
+1 1 1 1 0 1 1 1
+
+1 0 0 1 1 0 1 0
+
+1 0 0 0 1 0 1 0
+
+1 0 0 0 1 1 1 0]
+
+BW2 = bwfill(BW1,3,3,8) 
+
+BW2 =
+
+1 0 0 0 0 0 0 0
+
+1 1 1 1 1 0 0 0
+
+1 1 1 1 1 0 1 0
+
+1 1 1 1 1 1 1 0
+
+1 1 1 1 0 1 1 1
+
+1 0 0 1 1 0 1 0
+
+1 0 0 0 1 0 1 0
+
+1 0 0 0 1 1 1 0
+
+I = imread('blood1.tif'); BW3
+= ~im2bw(I);
+
+BW4
+= bwfill(BW3,'holes'); imshow(BW3)
+
+figure, imshow(BW4)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-06-43-2023-03-11-09-06-33-image.png)
+
+相关命令： 
+bwselect, roifill
+
+## 8.bwlabel
+
+功能：标注二进制图像中已连接的部分。
+
+语法： 
+
+```matlab
+L = bwlabel(BW,n) [L,num] = bwlabel(BW,n) 举例 
+BW = [1 1 1 0 0 0 0 0
+1 1 1 0 1 1 0 0
+1 1 1 0 1 1 0 0
+1 1 1 0 0 0 1 0
+1 1 1 0 0 0 1 0
+1 1 1 0 0 0 1 0
+1 1 1 0 0 1 1 0
+1 1 1 0 0 0 0 0]
+L = bwlabel(BW,4) L =
+1 1 1 0 0 0 0 0
+1 1 1 0 2 2 0 0
+1 1 1 0 2 2 0 0
+1 1 1 0 0 0 3 0
+1 1 1 0 0 0 3 0
+
+1 1 1 0 0 0 3 0
+1 1 1 0 0 3 3 0
+1 1 1 0 0 0 0 0
+[r,c] = find(L==2); rc = [r c]
+rc = 2 5
+3 5
+2 6
+3 6
+```
+
+相关命令： 
+bweuler, bwselect
+
+## 9.bwmorph
+
+功能：提取二进制图像的轮廓。
+
+语法： 
+
+```matlab
+BW2 = bwmorph(BW1,operation) 
+BW2 = bwmorph(BW1,operation,n) 
+```
+
+举例 
+
+```matlab
+BW1 = imread('circles.tif');
+imshow(BW1);
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-08-59-1678496938.png)
+
+```matlab
+BW2 = bwmorph(BW1,'remove'); 
+BW3 = bwmorph(BW1,'skel',Inf); 
+imshow(BW2)
+figure, imshow(BW3)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-09-26-1678496964.png)
+
+相关命令： 
+
+bweuler, bwperim, dilate, erode
+
+## 10.bwperim
+
+功能：计算二进制图像中对象的周长。
+
+语法： 
+
+```matlab
+BW2 = bwperim(BW1,n)
+```
+
+举例 
+
+```matlab
+BW1 = imread('circbw.tif'); 
+
+BW2 = bwperim(BW1,8); 
+
+imshow(BW1)
+
+figure, imshow(BW2)
+```
+
+![](https://raw.githubusercontent.com/timerring/scratchpad2023/main/2023/03/11-09-10-53-1678497051.png)
+
+相关命令： 
+
+bwarea, bweuler, bwfill
+
+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)