Human stereovision without localized image features |
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Authors: | Petra A Arndt Hanspeter A Mallot Heinrich H Bülthoff |
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Institution: | (1) Institut f\"ur Neuroinformatik, Ruhr-Universit\"at-Bochum, 44780 D-Bochum, Germany , DE;(2) Max-Planck-Institut f\"ur biologische Kybernetik, Spemannstrasse 38, D-72076 T\"ubingen, Germany , DE |
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Abstract: | Many theories of human stereovision are based on feature matching and
the related correspondence problem. In this paper, we present
psychophysical experiments indicating that localized image features
such as Laplacian zerocrossings, intensity extrema, or centroids are
not necessary for binocular depth perception. Smooth one-dimensional
intensity profiles were combined into stereograms with
mirror-symmetric half-images such that these localized image features
were either absent or did not carry stereo information. In a
discrimination task, subjects were asked to distinguish between
stereograms differing only by an exchange of these half-images (ortho-
vs. pseudoscopic stereograms). In a depth ordering task, subjects had
to judge which of the two versions appeared in front. Subjects are
able to solve both tasks even in the absence of the mentioned image
features. The performance is compared to various possible stereo
mechanisms. We conclude that localized image features and the
correspondences between them are not necessary to perceive
stereoscopic depth. One mechanism accounting for our data is
correlation or mean square difference.
Received: 8 February 1994 / Accepted in revised form: 15
September
1994 |
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Keywords: | |
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