Spatial frequency domain

1. What is spatial frequency domain?
2. What is the spatial domain?
3. What is an example of spatial frequency?
4. What is spatial frequency in radiography?

What is spatial frequency domain?

Spatial frequency domain imaging is a technique to separate the effects of scattering and absorption, and consequently, to approximately quantify a set of chromophores. The technique works by shining different patterns light on the tissue, recording a video of the remitted light, and processing the movie acquired.

What is the spatial domain?

The spatial domain is the normal image space, in which a change in position in I directly projects to a change in position in S. Distances in I (in pixels) correspond to real distances (e.g. in meters) in S.

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.