Separation of edge detection and brightness perception
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Updated: Aug 24, 2026

End-To-End Deep Neural Network for Salient Object Detection in Complex Environments
Published on: December 15, 2023
Tarja-L Peromaa1, Pentti I Laurinen
1Department of Psychology, University of Helsinki, P.O. Box 9, FIN-00014 Helsinki, Finland. tarja.peromaa@helsinki.fi
Abstract:
When a low spatial frequency noise mask is superimposed onto a luminance staircase, the perceived brightness pattern is dramatically altered although the edges remain visible. We measured contrast thresholds for the edges and for the illusory scalloping (Chevreul-illusion), as a function of noise center spatial frequency. The masking tuning functions overlapped, but peaked at different spatial frequencies and contrast levels. The results suggest that perceived brightness is triggered only by the low spatial frequency components of the edges--the high spatial frequency components are not able to produce a brightness pattern.
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