文档介绍：MATLAB图像处理函数汇总(一)
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('');
BW2 = applylut(BW1,lut);
imshow(BW1)
figure, imshow(BW2)
相关命令:
makelut
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
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('');
I2 = blkproc(I,[8 8],'std2(x)*ones(size(x))');
imshow(I)
figure, imshow(I2,[]);
相关命令:
colfilt, nlfilter,inline
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
功能: 计算二进制图像对象的面积.
语法:
total = bwarea(BW)
举例
BW = imread('');
imshow(BW);
附录 MATLAB图像处理命令 321
bwarea(BW)
ans =
15799
相关命令:
bweuler, bwperim
.
功能: 计算二进制图像的欧拉数.
语法:
eul = bweuler(BW,n)
举例
BW = imread('');
imshow(BW);
bweuler(BW)
ans =
-2
相关命令:
bwmorph, bwperim
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('');
BW3 = ~im2bw(I);
BW4 = bwfill(BW3,'holes');
imshow(BW3)
figure, imshow(BW4)
相关命令:
bwselect, roifill
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