Accession Number:

ADA031882

Title:

Representation and Recognition of the Spatial Organization of Three Dimensional Shapes,

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE ARTIFICIAL INTELLIGENCE LAB

Personal Author(s):

Report Date:

1976-08-01

Pagination or Media Count:

57.0

Abstract:

A method is given for representing 3-D shapes. It is based on a hierarchy of stick figures called 3-D models, where each stick corresponds to an axis in the shapes generalized cone representation. Although the representation of a complete shape may contain many stick figures at different levels of detail, only one stick figure is examined at a time while the representation is being used to interpret an image. By thus balancing scope of description against detail, the complexity of the computations needed to support the representation is minimized. The method requires a a database of stored stick figures b a simple device called the image-space processor for moving between object-centered and viewer-centered coordinate frames and c a process for relaxing a stored model onto the image during recognition. The relation of the theory to mental rotation phenomena is discussed, and some critical experimental predictions are made. Author

Subject Categories:

  • Anatomy and Physiology
  • Bionics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE