Howtosignalprocessing
The SI unit of spatial frequency is cycles per meter (m). In image-processing applications, spatial frequency is often expressed in units of cycles per millimeter (mm) or equivalently line pairs per mm.
- How do you calculate spatial frequency?
- What is an example of spatial frequency?
- What is spatial frequency in radiography?
- What is CPD spatial frequency?
How do you calculate spatial frequency?
Trigonometric functions and waves
As spatial frequency = k/2π, this gives 1/2π wavelengths per metre and the wavelength λ = 2π/k = 2π/1 = 2π m.
What is an example of spatial frequency?
Spatial frequency describes the periodic distributions of light and dark in an image. High spatial frequencies correspond to features such as sharp edges and fine details, whereas low spatial frequencies correspond to features such as global shape.
What is spatial frequency in radiography?
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.
What is CPD spatial frequency?
the number of repeating elements in a pattern per unit distance. In a simple pattern of alternating black and white vertical bars (an example of a square-wave grating), the spatial frequency is the number of pairs of black and white bars per degree of visual angle, usually expressed as cycles per degree (cpd).
