Minimum Points and Views for the Recovery of Three-Dimensional Structure.
CALIFORNIA UNIV IRVINE CONGNITIVE SCIENCES GROUP
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Mathematical analyses of motion perception have established minimum combinations of points and distinct views that are sufficient to recover three-dimensional 3D structure from two-dimensional 2D images, using such regularities as rigid motion, fixed axis of rotation, and constant angular velocity. To determine whether human subjects could recover 3D information at these theoretical levels, we presented subjects with pairs of displays and asked them to determine whether they represented the same or different 3D structures. Number of points was varied between 2 and 5 number of views was varied between 2 and 6 and the motion was either fixed axis with constant angular velocity, fixed axis with variable velocity, or variable axis with variable velocity. Accuracy increased with views, but decreased with points, apparently due to the increased difficulty of the comparison task as the structure became more complex. Subjects performance exceeded theoretical expectations, implying that they exploited regularities in addition to those in the theoretical analyses. Some possible additional regularities, and possible grouping effects, are discussed. Author
- Anatomy and Physiology
- Statistics and Probability