MATLAB图像处理命令集汇

geronimo123 · 发表于 2021-7-19 14:50

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1.applylut
功能:
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:
MATLAB高级应用——图形及影像处理 320
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);
附录 MATLAB图像处理命令 321
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
MATLAB高级应用——图形及影像处理 322
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

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:
附录 MATLAB图像处理命令 323
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

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');
MATLAB高级应用——图形及影像处理 324
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)
附录 MATLAB图像处理命令 325
相关命令:
bwarea, bweuler, bwfill

11.bwselect
功能:
在二进制图像中选择对象.
语法:
BW2 = bwselect(BW1,c,r,n)
BW2 = bwselect(BW1,n)
[BW2,idx] = bwselect(...)
举例
BW1 = imread('text.tif');
c = [16 90 144];
r = [85 197 247];
BW2 = bwselect(BW1,c,r,4);
imshow(BW1)
figure, imshow(BW2)
相关命令:
bwfill, bwlabel, impixel, roipoly, roifill

12.cmpermute
MATLAB高级应用——图形及影像处理 326
功能:
调整颜色映像表中的颜色.
语法:
[Y,newmap] = cmpermute(X,map)
[Y,newmap] = cmpermute(X,map,index)
举例
To order a colormap by luminance, use:
ntsc = rgb2ntsc(map);
[dum,index] = sort(ntsc(:,1));
[Y,newmap] = cmpermute(X,map,index);
相关命令:
randperm

13.cmunique
功能:
查找颜色映像表中特定的颜色及相应的图像.
语法:
[Y,newmap] = cmunique(X,map)
[Y,newmap] = cmunique(RGB)
[Y,newmap] = cmunique(I)
相关命令:
gray2ind, rgb2ind

14.col2im
功能:
将矩阵的列重新组织到块中.
语法:
A = col2im(B,[m n],[mm nn],block_type)
A = col2im(B,[m n],[mm nn])
相关命令:
blkproc, colfilt, im2col, nlfilter

15.colfilt
功能:
利用列相关函数进行边沿操作.
语法:
B = colfilt(A,[m n],block_type,fun)
B = colfilt(A,[m n],block_type,fun,P1,P2,...)
B = colfilt(A,[m n],[mblock nblock],block_type,fun,...)
B = colfilt(A,'indexed',...)
附录 MATLAB图像处理命令 327
相关命令:
blkproc, col2im, im2col, nlfilter

16.colorbar
功能:
显示颜色条.
语法:
colorbar('vert')
colorbar('horiz')
colorbar(h)
colorbar
h = colorbar(...)
举例
I = imread('blood1.tif');
h = fspecial('log');
I2 = filter2(h,I);
imshow(I2,[]), colormap(jet(64)), colorbar

17.conv2
功能:
进行二维卷积操作.
语法:
C = conv2(A,B)
C = conv2(hcol,hrow,A)
C = conv2(...,shape)
举例
A = magic(5)
A =
17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
MATLAB高级应用——图形及影像处理 328
10 12 19 21 3
11 18 25 2 9
B = [1 2 1;0 2 0;3 1 3]
B =
1 2 1
0 2 0
3 1 3
C = conv2(A,B)
C =
17 58 66 34 32 38 15
23 85 88 35 67 76 16
55 149 117 163 159 135 67
79 78 160 161 187 129 51
23 82 153 199 205 108 75
30 68 135 168 91 84 9
33 65 126 85 104 15 27
相关命令:
filter2

18.convmtx2
功能:
计算二维卷积矩阵.
语法:
T = convmtx2(H,m,n)
T = convmtx2(H,[m n])
相关命令:
conv2

19.convn
功能: 计算n维卷积.
语法:
C = convn(A,B)
C = convn(A,B,shape)
相关命令:
conv2

20.corr2
功能:
计算两个矩阵的二维相关系数.
附录 MATLAB图像处理命令 329
语法:
r = corr2(A,B)
相关命令:
std2

21.dct2
功能:
进行二维离散余弦变换.
语法:
B = dct2(A)
B = dct2(A,m,n)
B = dct2(A,[m n])
举例
RGB = imread('autumn.tif');
I = rgb2gray(RGB);
J = dct2(I);
imshow(log(abs(J)),[]), colormap(jet(64)), colorbar
J(abs(J) < 10) = 0;
K = idct2(J)/255;
imshow(K)
相关命令:
fft2, idct2, ifft2

nevadaooo · 发表于 2021-7-19 15:41

很实用的说

modengxian111 · 发表于 2021-7-19 17:04

收了收了

modengxian111 · 发表于 2021-7-19 17:06

还有示例，不错不错

DOUDOU斗 · 发表于 2021-7-19 17:16

很有用的内容，谢谢楼主分享

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MATLAB图像处理命令集汇

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