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Image Spectrum Explorer |
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The spectral information of an image, or its spatial frequencies, can be explored in this application.
This demonstration has two windows: one to display the image, and the other to present spectral and pixel information about the image. The larger colorful plot on the left is the two-dimensional Fourier transform of the entire image. The two plots below this show the spectra in the horizontal and vertical directions from the cross-hairs on the image in the window on the right. One can choose to either display the spectrum or the pixel values at the position of the cross-hairs.
The two-dimensional Fourier transform is a difficult thing to describe. The center of the plot represents the lowest frequency possible. As one moves further from the center, the frequency increases. The angular position of a component roughly corresponds to the angular spectral component in the image. In this particular image there is a lot of energy in the angles shown in the two-dimensional Fourier transform. The tilt of the cameraman's body and tripod create these frequencies.
Produced by Bob L. Sturm and Dr. Jerry Gibson.
Release date: February 2, 2004
Copyright 2003 University of California, Santa Barbara