Pictorial cues, together with motion and stereoscopic depth fields, can be used for perception and constitute ‘three kinds’ of vision. Edges in images are important features and can be created in either of these attributes. Are local edge and global shape detection processes attribute-specific? Three visual phenomena, believed to be due to low-level visual processes, were used as probes to address these issues. (1) Tilt illusions (misperceived orientation of a bar caused by an inducing grating) were used to investigate possible binding of edges across attributes. Double dissociation of tilt repulsion illusions (obtained with small orientation differences between inducer and bar) and attraction illusions (obtained with large orientation differences) suggest different mechanisms for their origins. Repulsion effects are believed to be due to processes in striate cortex and attraction because of higher level processing…
Contents
A brief view on the problem
Inverse optics and edges in images
Seeing edges by ‘three kinds of vision’
Pictorial edges
Temporal edges
Cyclopean edges
Binding edges across attributes and space
Tilt illusions (Study 1)
Probing binding with tilt illusions
Illusory contours (Study 2)
Probing binding with illusory contours
Seeing ‘snakes’ in noise (Study 3)
Probing binding with ‘snakes’
Binding the results
A new view on vision
Brunswik, Bayes, and binding
Binding by conjunction cells
Dynamic binding and computational modeling
Edge detection precedes surface ‘filling-in’
Concluding remarks
References
Author: Poom, Leo
Source: Uppsala University Library
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