中值和均值滤波---matlab实现（Median and mean filter ---matlab implementation）.doc
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中值和均值滤波---matlab实现（Median and mean filter ---matlab implementation）
%x is the image that needs filtering, and N is the template size (that is, n * n)
Function d=avg_filter (x, n)
A (1:n, 1:n) =1;%a, that is, n * n template, the element is 1
[height, width]=size (x);% input image is hightxwidth, and hightn, widthn
X1=double (x);
X2=x1;
For i=1:hight-n+1
For j=1:width-n+1
C=x1 (i:i+ (n-1), j:j+ (n-1)),.*a;%, take out X1 from J (I), start n row, n column element, and template multiply
S=sum (sum (c));% the sum of the elements in the C matrix
X2 (i+ (n-1), /2, j+ (n-1), /2) =s/ (n*n);% will assign the mean of the elements after the template operation to the central location of the template
End
End
Not assigned elements from% of original value
D=uint8 (x2);
Self compiled median filter function. X is the image that needs filtering, and N is the template size (that is, n * n)
Function d=mid_filter (x, n)
[height, width]=size (x);% input images are p * q, and pn, qn
X1=double (x);
X2=x1;
For i=1:height-n+1
For j=1:height-n+1
C=x1 (i:i+ (n-1), j:j+ (n-1));% out X1 from J (I); n row n column element, that is template (n * n)
E=c (1::);% is the first row of the C matrix
For u=2:n
E=[e, C (U::));% turns the C matrix into a row matrix
End
Mm=median (E);%mm is the median
X2 (i+ (n-1), /2, j+ (n-1) /2) =mm;%, the median of the template elements assigned to the center of the template
End
End
Not assigned elements from% of original value
D=uint8 (x2);
% of the Gauss filter function, S is the need to filter the image, n is the mean, and K is the variance
Function, d=gaussfilt (k, N, s)
Img = double (s);
N1=floor ((n+1) /2)% computed image center
For i=1:n
For j=1:n
B (I, J) =exp (- (i-n1) ^2+ (j-n1) ^2) / (4*k)) / (4*pi*k);
End
End
% generates Gauss sequence B.
Img1=conv2 (Img, B,same);% Gauss convolution is performed with the generated Gauss sequence convolution
D=uint8 (Img1);
(5) MATLAB code of median filtering
Global ImagenUmbral% defines a global variable, ImagenUmbral
Global J%
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