Matlab 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Matlab
标 题: Gabor小波算法(1)
发信站: BBS 哈工大紫丁香站 (Tue Jul 13 13:58:21 2004)
%%%%%%%VERSION 1
%The Gabor filter is basically a Gaussian (with variances sx and sy along
% x and y-axes respectively)
%modulated by a complex sinusoid (with centre frequencies U and V along
% x and y-axes respectively)
%described by the following equation
%%
% 1 -1 x ^ y ^
%%% G(x,y) = ---------- * exp ([----{(----) 2+(----) 2}+2*pi*i*(Ux+Vy)])
% 2*pi*sx*sy 2 sx sy
%% Describtion :
%% I : Input image
%% Sx & Sy : Variances along x and y-axes respectively
%% U & V : Centre frequencies along x and y-axes respectively
%% G : The output filter as described above
%% G : The output filter as described above
%% gabout : The output filtered image
%% Author : Ahmad poursaberi e-mail : a.poursaberi@ece.ut.ac.ir
%% Faulty of Engineering, Electrical&Computer Department,Tehran
%% University,Iran,June 2004
function [G,gabout] = gaborfilter(I,Sx,Sy,U,V);
if isa(I,'double')~=1
I = double(I);
end
for x = -fix(Sx):fix(Sx)
for y = -fix(Sy):fix(Sy)
G(fix(Sx)+x+1,fix(Sy)+y+1) = (1/(2*pi*Sx*Sy))*exp(-.5*((x/Sx)^2+...
(y/Sy)^2)+2*pi*i*(U*x+V*y));
end
end
Imgabout = conv2(I,double(imag(G)),'same');
Regabout = conv2(I,double(real(G)),'same');
for x = -fix(Sx):fix(Sx)
for y = -fix(Sy):fix(Sy)
G(fix(Sx)+x+1,fix(Sy)+y+1) = (1/(2*pi*Sx*Sy))*exp(-.5*((x/Sx)^2+...
(y/Sy)^2)+2*pi*i*(U*x+V*y));
end
end
Imgabout = conv2(I,double(imag(G)),'same');
Regabout = conv2(I,double(real(G)),'same');
gabout = uint8(sqrt(Imgabout.*Imgabout + Regabout.*Regabout));
--
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※ 修改:·zjliu 于 Jul 13 14:05:14 修改本文·[FROM: 202.118.229.*]
※ 来源:·哈工大紫丁香 http://bbs.hit.edu.cn·[FROM: 202.118.229.*]
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