Mach bands - definition of Mach bands by The Free Dictionary
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Mach bands (mäk)
Illusory bands of intensified lightness and darkness perceived adjacent to the borders of light and dark in a visual image, caused by image processing in the retina and optic nerve.
[After Ernst Machwho discovered them.]
References in periodicals archive
Observational astronomy is rife with examples of these "Mach bands
," notably the "Terby White Spot," a spurious bright feature often seen bordering the intensely black shadow cast by Saturn's globe across the planet's rings (S&T: May 2014, p.
He also became interested in optical illusions, which led to his identification of what came to be called Mach bands
. The story is told in a conversational tone with occasional philosophical asides from the authors.
represent a special form of brightness contrast occurring at borders of adjacent visual stimuli differing in luminance (reviewed in Fiorentini, 1972).