Abstract
We demonstrate a translation-invariant VanderLugt correlator (VLC) for a set of images stored via holographic angle multiplexing of volume gratings in a polymeric substrate. The images read out from the volume gratings are optically correlated in a translation-invariant manner with a dc-suppressed holographic filter. The quality and efficiency of this correlator are observed to be nearly as good as that of another VLC with images directly from a spatial light modulator used as inputs. This experiment is the first step toward realizing a novel optical image recognition system capable of identifying a query image through an exhaustive search in a large database of filter images stored in an ultrahigh capacity superparallel holographic random access memory (SPHRAM). In this system, the identification of the query image is to be performed with a translation invariant, real-time VLC or a joint transform correlator (JTC).
Original language | English (US) |
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Article number | 025201 |
Journal | Optical Engineering |
Volume | 45 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2006 |
Funding
This work was supported in part by Air Force Office of Scientific Research (AFOSR) Grant No. FA49620-03-1-0408.
Keywords
- Correlation
- Holography applications
- Image processing
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- General Engineering