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Volume holographic MACH correlator
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posted on 2023-06-07, 21:31 authored by Phil BirchPhil Birch, Akber Gardezi, Rupert YoungRupert Young, Chris ChatwinChris ChatwinVolume holographic correlators offer the ability to encode and compare thousands of templates in one operation. Angle multiplexing of each individual template means the position of the correlation spot in the output plane corresponds to the matching template. To be useful as a correlator the shift invariance must be restored by scanning the input image. This can be achieved by implementing the input signal modulation on a high speed SLM such as a MQW or DLP that is capable speeds in excess of 30kHz. The output correlation peak is read out using a high-speed linear CCD camera. The Bragg angle affects the number of templates that can be held on the hologram. However, this is not the same in both directions and this changes the correlator's shift invariance ability in different scan directions. In this paper we investigate this and how it affects the correlator's performance. This arrangement allows thousands of templates to be searched at video rate. The scanning nature allows space domain correlation to be implemented. The system we describe offers the ability to pre-filter the signal. We report on the results of a MACH filter implemented in a volume holographic correlator. The scanning window allows some interesting pre-filtering to be performed, such normalisation and non-linear optimisation.
History
Publication status
- Published
ISSN
0277-786XPublisher
SPIEExternal DOI
Volume
7696Presentation Type
- paper
Event name
Conference on Automatic Target Recognition XX - Acquisition, Tracking, Pointing, and Laser Systems Technologies XXIV - and Optical Pattern Recognition XXI, APR 05-08, 2010Event location
Orlando, FL, USAEvent type
conferenceISBN
978-0-8194-8160-3Department affiliated with
- Engineering and Design Publications
Notes
Proceedings of SPIE-The International Society for Optical EngineeringFull text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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