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- W2022702382 abstract "Image discrimination modes are used to predict the visibility of the difference between two images. Using a four category rating scale method, Rohaly et al. (SPIE Vol. 2411) and Ahumada & Beard (SPIE Vol. 2657) found that image discrimination models can predict target detectability when the background is kept constant, or 'fixed.' In experiment I, we use this same rating scale method and find no difference between 'fixed' and 'random' noise (where the white noise changes from trial to trial). In experiment II, we compare fixed noise and two random noise conditions. Using a two- interval forced-choice procedure, the 'random' noise was either the same or different in the two intervals. Contrary to image discrimination model predictions, the same random noise condition produced greater masking than the 'fixed' noise. This suggests that observers use less efficient target templates than image discrimination models implicitly assume. Also, performance appeared limited by internal process variability rather than external noise variability since similar masking was obtained for both random noise types.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W2022702382 title "<title>Image discrimination models: detection in fixed and random noise</title>" @default.
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