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A fundamental concept in visual science that quantifies the amount of detail present in a stimulus. It is defined as the number of cycles of a repeating pattern (like a sine wave grating) that occur per degree of visual angle (or arc minute).
read more about spatial frequency ...High spatial frequencies correspond to fine details (many cycles per degree), such as sharp edges or thin lines. Low spatial frequencies correspond to gross features or overall form (few cycles per degree), such as large blurred objects.
Spatial frequency is a critical variable used to measure the CSF, which plots the minimum contrast required to detect a pattern at various frequencies.
The CSF provides a more comprehensive measure of visual function than standard visual acuity, which only measures the highest frequency the eye can resolve.
Measured in cycles per degree (cpd). The highest spatial frequency humans can resolve is typically around 60 cpd.
Yes. The visual angle (and thus cpd) changes depending on how far away the stimulus is from the eye.
The human visual system is most sensitive (requires the least contrast) to frequencies around 2 to 4 cycles per degree.