Author: Wayne Rasband (wsr at nih.gov)
Dates: 2000/06/12: first version
2001/06/27: display amplitude if alt key down
Limitations:The images or selection must be square and the width and height must be a power of 2 (256x256, 512x512, etc). RGB color images are not supported.
Source: FFT_.java
Installation: This plugin is built into ImageJ 1.30 and later.
Description: Calculates forward and inverse Fourier transforms. Uses a real, 2D Fast Hartley Transform (FHT) routine contributed by Arlo Reeves, the author of ImageFFT. The frequency domain image is displayed as an 8-bit log scaled power spectrum with the 32-bit FHT as an image property. Editing, filtering, crosscorrelation and autocorrelation capabilities will be added in a future version.

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