next up previous
Next: Fourier Theory Up: Fourier Methods Previous: Fourier Methods

What do frequencies mean in an image?

If an image has large values at high frequency components then the data is changing rapidly on a short distance scale. e.g. a page of text

If the image has large low frequency components then the large scale features of the picture are more important. e.g. a single fairly simple object which occupies most of the image.

tex2html_wrap_inline2984 David Marshall 1994-1997