| http://www.w3.org/ns/prov#value | - A system (1) according to claim 36, wherein the means for moving the region of spatial frequencies comprising DC to a second part of the Fourier or Fresnel plane comprises the phase mask (4, 23, 43) in which the function of an optical component, such as a grating, a prism, etc, with an appropriate carrier frequency, has been encoded.
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