Matlab|Matlab 的fspecial函数用法
转自：http://blog.sina.com.cn/s/blog_6056e8800100hter.html
【Matlab|Matlab 的fspecial函数用法】
fspecial
函数用于建立预定义的滤波算子，其语法格式为：
h = fspecial(type)
h = fspecial(type
，
para)
其中
type
指定算子的类型，
para
指定相应的参数；
type
的类型有：
1
、
'average'
averaging filter
为均值滤波，参数为
hsize
代表模板尺寸，默认值为【
3
，
3
】。
H = FSPECIAL('average',HSIZE) returns an averaging filter H of size
HSIZE. HSIZE can be a vector specifying the number of rows and columns in
H or a scalar, in which case H is a square matrix.
The default HSIZE is [3 3].
2
、
'disk'
circular averaging filter
为圆形区域均值滤波，参数为
radius
代表区域半径，默认值为
5.
H = FSPECIAL('disk',RADIUS) returns a circular averaging filter
(pillbox) within the square matrix of side 2*RADIUS+1.
The default RADIUS is 5.
3
、
'gaussian'
Gaussian lowpass filter
为高斯低通滤波，有两个参数，
hsize
表示模板尺寸，默认值为【
3 3
】，
sigma
为滤波器的标准值，单位为像素，默认值为
0.5.
H = FSPECIAL('gaussian',HSIZE,SIGMA) returns a rotationally
symmetric Gaussian lowpass filter
of size HSIZE with standard
deviation SIGMA (positive). HSIZE can be a vector specifying the
number of rows and columns in H or a scalar, in which case H is a
square matrix.
The default HSIZE is [3 3], the default SIGMA is 0.5.
4
、
'laplacian' filter approximating the 2-D Laplacian operator
为拉普拉斯算子，参数
alpha
用于控制算子形状，取值范围为【
0
，
1
】，默认值为
0.2.
H = FSPECIAL('laplacian',ALPHA) returns a 3-by-3 filter
approximating the shape of the two-dimensional Laplacian
operator. The parameter ALPHA controls the shape of the
Laplacian and must be in the range 0.0 to 1.0.
The default ALPHA is 0.2.
5
、
'log'
Laplacian of Gaussian filter
为拉普拉斯高斯算子，有两个参数，
hsize
表示模板尺寸，默认值为【
3 3
】，
sigma
为滤波器的标准差，单位为像素，默认值为
0.5.
H = FSPECIAL('log',HSIZE,SIGMA) returns a rotationally symmetric
Laplacian of Gaussian filter of size HSIZE with standard deviation
SIGMA (positive). HSIZE can be a vector specifying the number of rows
and columns in H or a scalar, in which case H is a square matrix.
The default HSIZE is [5 5], the default SIGMA is 0.5.
6
、
'motion'
motion filter
为运动模糊算子，有两个参数，表示摄像物体逆时针方向以
theta
角度运动了
len
个像素，
len
的默认值为
9
，
theta
的默认值为
0
；
H = FSPECIAL('motion',LEN,THETA) returns a filter to approximate, once
convolved with an image, the linear motion of a camera by LEN pixels,
with an angle of THETA degrees in a counter-clockwise direction. The
filter becomes a vector for horizontal and vertical motions.
The
default LEN is 9, the default THETA is 0, which corresponds to a
horizontal motion of 9 pixels.
7
、
'prewitt'
Prewitt horizontal edge-emphasizing filter
用于边缘增强，大小为【
3 3
】，无参数
H = FSPECIAL('prewitt') returns 3-by-3 filter that emphasizes
horizontal edges by approximating a vertical gradient. If you need to
emphasize vertical edges, transpose the filter H: H'.
[1 1 1;
0 0 0;
-1 -1 -1].
8
、
'sobel'
Sobel horizontal edge-emphasizing filter
用于边缘提取，无参数
H = FSPECIAL('sobel') returns 3-by-3 filter that emphasizes
horizontal edges utilizing the smoothing effect by approximating a
vertical gradient. If you need to emphasize vertical edges, transpose
the filter H: H'.
[1 2 1;
0 0 0;
-1 -2 -1].
9
、
'unsharp'
unsharp contrast enhancement filter
为对比度增强滤波器。参数
alpha
用于控制滤波器的形状，范围为【
0
，
1
】，默认值为
0.2.
H = FSPECIAL('unsharp',ALPHA) returns a 3-by-3 unsharp contrast
enhancement filter. FSPECIAL creates the unsharp filter from the
negative of the Laplacian filter with parameter ALPHA. ALPHA controls
the shape of the Laplacian and must be in the range 0.0 to 1.0.
The default ALPHA is 0.2.
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