frequency space
A real space image of an object, which is in the spatial domain, can be subjected to a Fourier transform to yield its frequency domain representation, where the signal at each point corresponds to a spatial frequency present in the image. This frequency space image can also be converted back to a spatial domain image using a Fourier transform.
Synonyms: Fourier space, reciprocal space, spatial frequency domain, frequency domain
See also: Fourier optics, Fourier transform, image space, spatial frequency
