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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)

1.applylut

在二进制图像中利用lookup 表进行边沿操作。

语法:

A = applylut(BW,lut) 

举例

lut = makelut('sum(x(:)) == 4',2); 

BW1 = imread('text.tif'); 

BW2 = applylut(BW1,lut); 

imshow(BW1) 

figure, imshow(BW2)

相关命令: makelut

2.bestblk

功能:确定进行块操作的块大小。

语法:

siz = bestblk([m n],k) 

[mb,nb] = bestblk([m n],k) 

举例

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:

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

I = imread('alumgrns.tif');

I2 = blkproc(I,[8 8],'std2(x)*ones(size(x))');

imshow(I)

figure, imshow(I2,[]);

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:

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:

total = bwarea(BW)

举例

BW = imread('circles.tif');
imshow(BW);

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:

eul = bweuler(BW,n) 

举例

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:

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

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)

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:

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:

BW2 = bwmorph(BW1,operation) 
BW2 = bwmorph(BW1,operation,n) 

举例

BW1 = imread('circles.tif');
imshow(BW1);

BW2 = bwmorph(BW1,'remove'); 
BW3 = bwmorph(BW1,'skel',Inf); 
imshow(BW2)
figure, imshow(BW3)

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:

BW2 = bwperim(BW1,n)

举例

BW1 = imread('circbw.tif'); 

BW2 = bwperim(BW1,8); 

imshow(BW1)

figure, imshow(BW2)

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.

[2] 阮秋琦. 数字图像处理(MATLAB版)[M]. 北京:电子工业出版社, 2014.

[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.

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