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D Weinshall

Publications and source records attributed to D Weinshall.

3 recordsLinked to original sources
PubMed1991

A self-organizing multiple-view representation of 3D objects.

We explore representation of 3D objects in which several distinct 2D views are stored for each object. We demonstrate the ability of a two-layer network of thresholded summation units to support such representations. Using unsupervised Hebbian relaxation, the network learned to recognize ten objects from different viewpoints. The training process led to the emergence of compact representations of the specific input views. When tested on novel views of the same objects, the network exhibited a substantial generalization capability. In simulated psychophysical experiments, the network's behavior was qualitatively similar to that of human subjects.

Cybernetics↗
PubMed1991

Seeing "ghost" planes in stereo vision.

I have studied particular ambiguous random dot stereograms where multiple matches (that are equally possible) are available at each point. The human visual system resolves these ambiguities in two qualitatively different ways. In some cases a few transparent surfaces are perceived corresponding to all the ambiguous matches. In other cases a single dominant opaque surface is perceived. The conditions under which each behavior occurs are described. Additional experiments, designed to explore whether a number of modified stereo matching algorithms can predict human perception, are described, and their theoretical implications are discussed.

Algorithms↗