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Influence of flatness distortion on the output of a liquid-crystal-television-based joint transform correlator system


Demoli, Nazif; Dahms, Uwe; Gruber, Hartmut; Wernicke, Guenther
Influence of flatness distortion on the output of a liquid-crystal-television-based joint transform correlator system // Applied optics, 36 (1997), 32; 8417-8426 doi:10.1364/AO.36.008417 (međunarodna recenzija, članak, znanstveni)


Naslov
Influence of flatness distortion on the output of a liquid-crystal-television-based joint transform correlator system

Autori
Demoli, Nazif ; Dahms, Uwe ; Gruber, Hartmut ; Wernicke, Guenther

Izvornik
Applied optics (0003-6935) 36 (1997), 32; 8417-8426

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Liquid-crystal television; joint transform correlator

Sažetak
The use of a liquid-crystal panels from a commercially available Sanyo video projector as spatial light modulators in a standard joint transform correlator system is investigated. It is found that the flatness distortion of the panel disturbs the output correlation signal in general. Since the reported solutions for the flatness corrections are either expensive (liquid gates) or suffer from low light efficiency (holographic techniques), we have investigated the possibility to minimize the influence of these distortions on the correlation output without flatness correction. First we quantify optical flatness across the transparent panel area, and then we measure the effects of flatness distortion by changing the display location of the input objects and the resulting joint power spectrum. It is found that the correlation peak is 1 order of magnitude more sensitive to phase distortions of the input scene than to the same distortions of the joint power spectrum. Choosing the flattest location on the panel allows the utilization of the panels to be demonstrated through recognition of cuneiform inscription signs.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
00350102

Ustanove
Institut za fiziku, Zagreb

Autor s matičnim brojem:
Nazif Demoli, (87146)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI


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