谁帮我看看 这个指纹特征提取是根据什么方法提取的
%获取特征向量function = feature_extract( flitered_image )
global img image center_x center_y band_num band_width wedge_num hole_radius gabor_num sector_length sector_num sector_index
length=sector_length;
s_num=sector_num+2;
s_size=length*length;
mean_s=zeros(s_num,1);
var_s=zeros(s_num,1);
num_s=zeros(s_num,1);
N=zeros(sector_length);
%获取特征向量
for ( i=1:1:s_size)
s_index=sector_index(i);
s_index=s_index+1;
mean_s(s_index)= mean_s(s_index)+flitered_image(i);
num_s(s_index)=num_s(s_index)+1;
end
for (i=1:1:s_num)
mean_s(i)=mean_s(i)/num_s(i);
end
for ( i=1:1:s_size)
s_index=sector_index(i);
s_index=s_index+1;
var_s(s_index)= var_s(s_index) + (flitered_image(i)- mean_s(s_index))^2;
end
for (i=1:1:s_num)
var_s(i)= var_s(i) / num_s(i);
end
for (i=1:1:s_size)
s_index=sector_index(i);
s_index=s_index+1;
N(i)=var_s(s_index);
end
vector_tmp=zeros(s_num,1);
for ( i=1:1:s_size)
s_index=sector_index(i);
s_index=s_index+1;
vector_tmp(s_index)= vector_tmp(s_index) + abs(flitered_image(i)- mean_s(s_index));
end
for (i=1:1:s_num)
vector_tmp(i)=vector_tmp(i)/num_s(i);
end
vector=vector_tmp;
最好 可以帮我每个注释下 帮助我理解下 谢谢！！！！！！！！
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