Two-dimensional Fourier transformation utility

Version 1.0.2 (56,8 KB) von Masayuki Tanaka
It provides some utility functions for the two-dimensional Fourier transform.
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Aktualisiert 29. Apr 2023

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It provides some utility functions for the two-dimensional Fourier transform.
run demo_fourier2.m
Textbooks usually show the Fourier spectrum which the DC component is located at the center of the graph. However, matlab function of fft2 provides the Fourier transform whose DC component is top-left. It is not convenient for us. Then, it provides simple warp function to generate a texbook like Fourier spectrum.
Fourier transform implicitly assumes an input image is cyclic.
This implicit assumption produces an artifact in the Fourier domain because the border of an image usually has strong edges.
In order to reduce this artifact, the window is usually applied to the image before the Fourier transformation.
But, if we want to operate in the Fourier domain, the window is not suitable. Then, it also provides the padding function for the Fourier transform.
demo_fourier2 : sample program
fourier2, ifourier2 : wrap functions of fft2 and ifft2
FourierSpectrum2: warp function to estimate Fourier spectrum
fbourder2, ifboruder2: padding functions for Fourier transform
fblackman2: window function
demo_fourier2 : sample program
fourier2, ifourier2 : wrap functions of fft2 and ifft2
FourierSpectrum2: warp function to estimate Fourier spectrum
fbourder2, ifboruder2: padding functions for Fourier transform
fblackman2: window function

Zitieren als

Masayuki Tanaka (2024). Two-dimensional Fourier transformation utility (https://www.mathworks.com/matlabcentral/fileexchange/128754-two-dimensional-fourier-transformation-utility), MATLAB Central File Exchange. Abgerufen .

Kompatibilität der MATLAB-Version
Erstellt mit R2023a
Kompatibel mit allen Versionen
Plattform-Kompatibilität
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Version Veröffentlicht Versionshinweise
1.0.2

Updated description
1.0.1

Updated description
1.0.0