matlab 에서 Gabor 필터 구현

다음으로 이동:http://blog.csdn.net/abcjennifer/article/details/7360436 1.spatialgabor.m 설명 gabor 함수
% SPATIALGABOR - applies single oriented gabor filter to an image % % Usage: % [Eim, Oim, Aim] = spatialgabor(im, wavelength, angle, kx, ky, showfilter) % % Arguments: % im - Image to be processed. % wavelength - Wavelength in pixels of Gabor filter to construct % angle - Angle of filter in degrees. An angle of 0 gives a % filter that responds to vertical features. % kx, ky - Scale factors specifying the filter sigma relative % to the wavelength of the filter. This is done so % that the shapes of the filters are invariant to the % scale. kx controls the sigma in the x direction % which is along the filter, and hence controls the % bandwidth of the filter. ky controls the sigma % across the filter and hence controls the % orientational selectivity of the filter. A value of % 0.5 for both kx and ky is a good starting point. % showfilter - An optional flag 0/1. When set an image of the % even filter is displayed for inspection. % % Returns: % Eim - Result from filtering with the even (cosine) Gabor filter % Oim - Result from filtering with the odd (sine) Gabor filter % Aim - Amplitude image = sqrt(Eim.^2 + Oim.^2) %
% Peter Kovesi % School of Computer Science & Software Engineering % The University of Western Australia % pk at csse uwa edu au % http://www.csse.uwa.edu.au/~pk % % October 2006
function [Eim, Oim, Aim] = spatialgabor(im, wavelength, angle, kx, ky, showfilter)

 if nargin == 5
     showfilter = 0;
 end

 im = double(im);
 [rows, cols] = size(im);
 newim = zeros(rows,cols);

 % Construct even and odd Gabor filters
 sigmax = wavelength*kx;
 sigmay = wavelength*ky;

 sze = round(3*max(sigmax,sigmay));
 [x,y] = meshgrid(-sze:sze);
 evenFilter = exp(-(x.^2/sigmax^2 + y.^2/sigmay^2)/2)...
.*cos(2*pi*(1/wavelength)*x);

 oddFilter = exp(-(x.^2/sigmax^2 + y.^2/sigmay^2)/2)...
.*sin(2*pi*(1/wavelength)*x);    


 evenFilter = imrotate(evenFilter, angle, 'bilinear');
 oddFilter = imrotate(oddFilter, angle, 'bilinear');    


 % Do the filtering
 Eim = filter2(evenFilter,im); % Even filter result
 Oim = filter2(oddFilter,im);  % Odd filter result
 Aim = sqrt(Eim.^2 + Oim.^2);  % Amplitude 

 if showfilter % Display filter for inspection
     figure(1), imshow(evenFilter,[]); title('filter'); 
 end

2.main.m
ori=imread(‘D:\Images\New\Cars\image_0001.jpg’); grayimg=rgb2gray(ori); gim=im2double(grayimg);
[Eim,Oim,Aim]=spatialgabor(gim,3,90,0.5,0.5,1);%90-vertical===0-horizontal imshow(Aim);