Spatial filtering using the active-space indexing method

Sudhanshu K. Semwal*, Jun Ohya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Traditionally most camera-based position estimation systems use only a few points to calibrate cameras. In this paper, we investigate a novel and alternate approach for 3D position estimation by using a larger number of points arranged in a 3D grid. We present an implementation of the active-space indexing mechanism which uses three cameras. Given the corresponding points in camera images, a precise estimation of the position can be obtained. The active-space indexing method can be also used as a spatial filter to eliminate the large number of possible corresponding pairs from consideration. This capability, unique only to the active-space indexing method, provides a tractable algorithm to the otherwise intractable situation.

Original languageEnglish
Pages (from-to)135-150
Number of pages16
JournalGraphical Models
Issue number3
Publication statusPublished - 2001 May
Externally publishedYes


  • 3D position estimation
  • 3D spatial data structure
  • Camera calibration for multiple camera images
  • Computer vision techniques for 3D model building
  • Geometric algorithms
  • Virtual environments

ASJC Scopus subject areas

  • Software
  • Modelling and Simulation
  • Geometry and Topology
  • Computer Graphics and Computer-Aided Design


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