Abstract

This paper presents an experimental study of the rms error with which a three-dimensional representation of a shape (a shell) is formed in the visual system when a three-dimensional (3D) object is observed. Objects of sculptured form were used in the experiments, i.e., uniformly colored white, with various degrees of complexity in uniform lighting. During the experiments, 3D images of test objects previously subjected to distortions were presented to observers along with their undistorted prototypes. The observers' task was to determine the threshold at which distortions became appreciable. As a result, values are found for the barely noticeable rms deviations of the shells of 3D-distorted objects from the shells of undistorted objects.

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