MATLAB Image Processing _ Fourier transformation, matlab Fu Li

MATLAB Image Processing _ Fourier transformation, matlab Fu Li

Use relevant functions such as fft in matlab.

The Code is as follows:

Clear‑clc‑img‑imread('test.jpg '); img = rgb2gray (img); f = fft2 (img); % Fourier transform f = fftshift (f); % symmetric image r = real (f ); % calculate the real part I = imag (f) of the image in the frequency domain; % calculate the virtual part margin = log (abs (f) of the image in the frequency domain; % the image amplitude spectrum, add log to facilitate the display of phase = log (angle (f) * 180/pi); % image phase spectrum l = log (f); subplot (, 1), imshow (img ), title ('source image'); subplot (2,2, 2), imshow (l, []), title ('spectral '); subplot (2,2, 3 ), imshow (margin, []), title ('amplitude spectral '); subplot (, 4), imshow (phase, []), title ('Phase spectral ');