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Amplitude spectra of natural images
Author(s) -
Tolhurst D. J.,
Tadmor Y.,
Chao Tang
Publication year - 1992
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1992.tb00296.x
Subject(s) - amplitude , spectral line , logarithm , curvature , line (geometry) , optics , range (aeronautics) , mathematics , physics , geometry , mathematical analysis , materials science , astronomy , composite material
Several studies have suggested that the amplitude spectra of photographs of natural scenes are remarkably similar and have the form:This is, of course, a straight line with slope of −1.0 when plotted on double logarithmic coordinates. We have examined the amplitude spectra of 135 digitized photographs of natural scenes and have Found that relatively few images conform exactly to the suggestion. About 25% of the images in our sample have spectra which show significant curvature when plotted on log log coordinates. The best‐fitting regression lines have slopes that range from −0.8 to −1.5: the average slope is −1.2, rather sleeper than previously suggested.