Scale-invariant recognition of three-dimensional objects by use of a quasi-correlator

Youzhi Li, Joseph Rosen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A method of scale-invariant recognition of three-dimensional (3-D) objects is presented. Several images of the observed scene are recorded under white-light illumination from several different points of view and compressed into a single complex two-dimensional matrix. After filtering with a single scaleinvariant filter, the resultant function is then coded into a computer-generated hologram (CGH). When this CGH is coherently illuminated, a correlation space is reconstructed in which light peaks indicate the existence and location of true targets in the tested 3-D scene. The light peaks are detectable for different sizes of the true objects, as long as they are within the invariance range of the filter. Experimental results in a complete electro-optical system are presented, and comparisons with other systems are investigated by use of computer simulation.

Original languageEnglish
Pages (from-to)811-819
Number of pages9
JournalApplied Optics
Issue number5
StatePublished - 10 Feb 2003

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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