Modeling Foreshortening in Stereo Vision Using Local Spatial Frequency.

Abstract

Many aspects of the real world continue to plague stereo matching systems. One of these is perspective foreshortening, an effect that occurs when a surface is viewed at a sharp angle. Because each stereo camera has a slightly different view, the image of the surface is more compressed and occupies a smaller area in one view. These effects cause problems because most stereo methods compare similarly-sized regions (using the same-sized windows in both images), tacitly assuming that objects occupy the same extents in both images. Clearly this condition is violated by perspective foreshortening. We show how to overcome this problem using a Local Spatial Frequency representation. A simple geometric analysis leads to an elegant solution in the frequency domain which, when applied to a Gabor filter-based stereo system, increases the system's maximum matchable surface angle from 30 degrees to over 75 degrees.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1995
Accession Number
ADA292246

Entities

People

  • Mark W. Maimone
  • Steven Arthur Shafer

Organizations

  • Carnegie Mellon University

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Biomedical
  • Engineered Resilient Systems
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Algorithms
  • Artificial Intelligence
  • Complex Numbers
  • Computations
  • Computer Science
  • Computer Stereo Vision
  • Computer Vision
  • Equations
  • Frequency Shift
  • Geometric Forms
  • Geometry
  • Measurement
  • Pattern Recognition
  • Signal Processing
  • Statistical Analysis
  • Three Dimensional
  • Two Dimensional

Readers

  • Computer Vision.
  • Systems Analysis and Design