When viewing complex images, discomfort was best predicted from how contrast energy was distributed across spatial frequencies. Images rated as uncomfortable to view ded to have greater amplitude close to 3 cycles/degree; within their radially averaged Fourier amplitude spectra, relative to elsewhere in the spectrum. Luminance gratings with spatial frequencies of 3 cycles/degree are those most likely to elicit epileptiform activity, migraine, discomfort, and visuo-perceptual distortions (Wilkins et al., 1984). We conclude that uncomfortable images contain greater relative contrast energy at those spatial frequencies to which the visual system is generally most sensitive.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:496251 |
| Date | January 2008 |
| Creators | Fernandez, D. A. W. |
| Publisher | University of Essex |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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