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Abstract:

We present a technique that allows us to increment the number of objects to be detected and classified simultaneously in an optical patterns recognition process. It basically consists of the multiplexing of several phase-only filters. The elimination of the convolution signal at the final correlation plane, by means of the direct implementation of phase-only filters, allows an increase in the number of channels to be used in a Vander Lugt correlator. The difference among these composed filters and others proposed before lies in the way they are synthesized. Usually filters are physically implemented by using amplitude media, and it is necessary to perform an encoding of the phase information. In the proposed method, no encoding technique is used to convert the phase values into amplitude ones. The implementation of this kind of filter is carried out by using liquid crystal displays working in phase-only mode. We present in this work numerical simulations and experimental results obtained from the implementation of two different kinds of phase-only filters. Impulse responses and correlation signals are analyzed.

Registro:

Documento: Artículo
Título:Parallel classification of multiple objects using a phase-only multichannel optical correlator
Autor:Villareal, M.; Iemmi, C.; Campos, J.
Filiación:Universidad de Buenos Aires, Laboratorio de Procesado de Imagenes, Departmento de Física, 1428 Buenos Aires, Argentina
Universidad Autonoma de Barcelona, Grupo de Optica, E-08193 Bellaterra, Spain
Palabras clave:Liquid crystal displays; Pattern recognition; Phase-only filters; Computer simulation; Convolution; Correlators; Fourier transforms; Liquid crystal displays; Multiplexing; Optical correlation; Optical filters; Optical correlators; Optical pattern recognition; Phase only filters; Vander Lugt correlator; Object recognition
Año:2003
Volumen:42
Número:8
Página de inicio:2354
Página de fin:2361
DOI: http://dx.doi.org/10.1117/1.1585060
Título revista:Optical Engineering
Título revista abreviado:Opt Eng
ISSN:00913286
CODEN:OPEGA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00913286_v42_n8_p2354_Villareal

Referencias:

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  • Marquez, A., Iemmi, C., Moreno, I., Davis, J., Campos, J., Yzuel, M., Quantitative predictions of the modulation behavior of twisted nematic liquid crystal displays based on a simple physical model (2001) Opt. Eng., 40 (11), pp. 2558-2564
  • Márquez, A., Campos, J., Yzuel, M.J., Moreno, I., Davis, J.A., Iemmi, C., Moreno, A., Robert, A., Characterization of edge effects in twisted nematic liquid crystal displays (2000) Opt. Eng., 39 (12), pp. 3301-3307

Citas:

---------- APA ----------
Villareal, M., Iemmi, C. & Campos, J. (2003) . Parallel classification of multiple objects using a phase-only multichannel optical correlator. Optical Engineering, 42(8), 2354-2361.
http://dx.doi.org/10.1117/1.1585060
---------- CHICAGO ----------
Villareal, M., Iemmi, C., Campos, J. "Parallel classification of multiple objects using a phase-only multichannel optical correlator" . Optical Engineering 42, no. 8 (2003) : 2354-2361.
http://dx.doi.org/10.1117/1.1585060
---------- MLA ----------
Villareal, M., Iemmi, C., Campos, J. "Parallel classification of multiple objects using a phase-only multichannel optical correlator" . Optical Engineering, vol. 42, no. 8, 2003, pp. 2354-2361.
http://dx.doi.org/10.1117/1.1585060
---------- VANCOUVER ----------
Villareal, M., Iemmi, C., Campos, J. Parallel classification of multiple objects using a phase-only multichannel optical correlator. Opt Eng. 2003;42(8):2354-2361.
http://dx.doi.org/10.1117/1.1585060