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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Industry/Domain: Health care
Category: Optometry
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Related terms

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.

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(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, ...

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

spatial-frequency filtering

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

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The number of items occurring in a given category.

ophthalmoscope

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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 ...