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均值滤波,加权滤波,中值滤波的MATLAB实例,用于图象及信号的处理

picture=imread('Fig3.15(a)2.jpg');
[r,c]=size(picture);
%picture1=picture+1;
A=zeros(1,256);
for i=1:r
    for j=1:c
        a=picture(i,j);
        if(a>256)
            a=256;
            A(1,a)=A(1,a)+1;
        elseif(a==0)
            a=1;
           A(1,a)=A(1,a)+1;
        else
           A(1,a)=A(1,a)+1;  
        end
     end
end
subplot(1,2,1)
x=1:1:256;
y=A(1,x)/(r*c);
stem(x,y,'.');
subplot(1,2,2)
[y,x]=imhist(picture);
y=y/(r*c);
stem(x,y,'.');