Spatial frequency

Spatial frequency

In optics and other fields, a measure of how often a repeating structure (such as a vertical line or bar) appears within a given unit of distance.

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Part of Speech: noun
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Industry/Domain: Health care
Category: Optometry
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spatial frequency

Physics; Color science

A measure of how rapidly a property changes in space. A commonly used form of visual stimulus consists of vertical bars where the lightness varies according to a sinusoidal ...

spatial frequency

Health care; Optometry

In optics and other fields, a measure of how often a repeating structure (such as a vertical line or bar) appears within a given unit of distance.

spatial frequency

Earth science; Mapping science

(1) The number of times a design is repeated over a given distance. (2) The number of times a design is repeated per unit distance in a specified direction. In both definitions, ...

spatial frequency

Materials science; Material physics

Also known as the wave number, it is 2π/λ, where λ is the wavelength.

spatial-frequency filtering

Earth science; Remote sensing

The analysis of the spatial variations in DN of an image and the separation or suppression of selected frequency ranges.

frequency

Natural environment; Coral reefs

The number of items occurring in a given category.

ophthalmoscope

Eyewear; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

pantoscopic angle

Eyewear; Optometry

1. Angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in the primary position, usually taken to be the horizontal. 2. Angle ...

optical material

Eyewear; Optometry

Transparent material capable of being manufactured into optical components.

optical radiation hazard

Eyewear; Optometry

Possibility of damage to the retina by optical radiation.

optical centre

Eyewear; Optometry

For practical purposes, the intersection of the optical axis with the front surface a lens.

ophthalmoscope

Optometry; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

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