Howtosignalprocessing
- What is the formula of spatial frequency?
- What is the spatial frequency of an image?
- How is spatial frequency expressed in digital imaging?
What is the formula of spatial frequency?
As spatial frequency = k/2π, this gives 1/2π wavelengths per metre and the wavelength λ = 2π/k = 2π/1 = 2π m.
What is the spatial frequency of an image?
"Spatial frequency" refers to the number of pairs of bars imaged within a given distance on the retina. One-third of a millimeter is a convenient unit of retinal distance because an image this size is said to subtend one degree of visual angle on the retina.
How is spatial frequency expressed in digital imaging?
Spatial frequency is generally expressed as cycles, or line pairs, per millimeter (lp/mm) in analog environments, but for digital systems, cycles per pixel (c/p) is more appropriate where sensor sizes vary from one detector to another.
