Seance1.m 1.79 KB
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%%
clear all;
I = imread('Amosite5.jpg');
figure(1)
imagesc(I)
colormap(gray)
colorbar
img_fft = fftshift(fft2(I));
figure(2)
imagesc(20*log10(abs(img_fft)))
%%
clear all;
load('angiocor.mat');
figure(1)
imagesc(angiocor)
colormap(gray)
colorbar
img_fft = fftshift(fft2(angiocor));
figure(2)
imagesc(20*log10(abs(img_fft)))
%%
clear all;

load('barbara.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar
figure(2)
img_fft = fftshift(fft2(X));
imagesc(20*log10(abs(img_fft)))

%%
clear all;

load('cuir.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar
figure(2)
img_fft = fftshift(fft2(X));
imagesc(20*log10(abs(img_fft)))

%%
clear all;

load('empreinte_roi.mat');
figure(1)
imagesc(image)
colormap(gray)
colorbar
img_fft = fftshift(fft2(image));
figure(2)
imagesc(20*log10(abs(img_fft)))

Z = 20*log10(abs(fft2(image)));
[M,I] = max(Z(:));
[I_row, I_col] = ind2sub(size(Z),I);
N = size(Z);
vu1 = (I_col - 1)/N(1);
vu2 = (I_row - 1)/N(1);
rho = sqrt(vu1*vu1 + vu2*vu2);
phi = atan(vu2/vu1);

% 
x = [-N/2:1:N/2];
y = transpose([-N/2:1:N/2]);

H = exp(-x*x+y*y)

%%
clear all;
load('head.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar

img_fft = fftshift(fft2(X));
figure(2)
imagesc(20*log10(abs(img_fft)))

%%
clear all;
load('lena512.mat');
figure(1)
imagesc(lena512)
colormap(gray)
colorbar
img_fft = fftshift(fft2(lena512));
figure(2)
imagesc(20*log10(abs(img_fft)))

%%
clear all;
load('poupee.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar
figure(2)
img_fft = fftshift(fft2(X));
imagesc(20*log10(abs(img_fft)))

%%
clear all;
load('tartan.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar
figure(2)
img_fft = fftshift(fft2(X));
imagesc(20*log10(abs(img_fft)))

%%
clear all;
load('tyre.mat');
figure(1)
imagesc(X)
colormap(gray)
colorbar
figure(2)
img_fft = fftshift(fft2(X));
imagesc(20*log10(abs(img_fft)))