[MATLAB图像处理] 求助！为什么下面运行结果不是数组啊？

[kanjipeng]

>> a=[1 1 0 0 0
1 1 0 0 0
0 0 0 1 1
0 0 0 1 1];
b=bwlabel(a,4);
regionprops(b)

ans =

2x1 struct array with fields:
Area
Centroid
BoundingBox

>>

[ChinaSun888]

作者: kanjipeng

>> a=[1 1 0 0 0
1 1 0 0 0
0 0 0 1 1
0 0 0 1 1];
b=bwlabel(a,4);
regionprops(b)

ans =

2x1 struct array with fields:
Area
Centroid
BoundingBox

>>

regionprops(b)生成的是一个结构数组
如果写成
>> f=regionprops(b)
f =
4x1 struct array with fields:
Area
Centroid
BoundingBox

>> f.Area
ans =
2
ans =
2
ans =
2
ans =
2
>> f.Centroid
ans =
1.5000 1.0000
ans =
6.5000 1.0000
ans =
14.5000 1.0000
ans =
19.5000 1.0000