The digital fractional correlator utilized for character recognition: a comparative study

Cesar O. Torres Moreno; Lorenzo Mattos Vasquez; G. Mestre; Yezid M. Torres Moreno

doi:10.1117/12.591761

21 October 2004 The digital fractional correlator utilized for character recognition: a comparative study

Cesar O. Torres Moreno, Lorenzo Mattos Vasquez, G. Mestre, Yezid M. Torres Moreno

Proceedings Volume 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications; (2004) https://doi.org/10.1117/12.591761
Event: 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, 2004, Porlamar, Venezuela

Abstract

Some properties of digital correlation based of the fractional Fourier transform are analyzed. We generalize the architecture of a VanderLugt correlator to achieve the VanderLugt fractional Fourier transform correlator such that fractional correlation can be obtained. In this situation the Fourier transform in the classical VanderLugt is replaced by the fractional Fourier transform, and four different VanderLugt fractional architectures can be implemented. The performances of such a correlator are analyzed according to the standard criteria of signal-to-noise ratio, correlation sharpness, peak-to-correlation energy, and Horner efficiency. Here the binary image of a character is used for the test.

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Cesar O. Torres Moreno, Lorenzo Mattos Vasquez, G. Mestre, and Yezid M. Torres Moreno "The digital fractional correlator utilized for character recognition: a comparative study", Proc. SPIE 5622, 5th Iberoamerican Meeting on Optics and 8th Latin American Meeting on Optics, Lasers, and Their Applications, (21 October 2004); https://doi.org/10.1117/12.591761

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KEYWORDS

Optical correlators

Fractional fourier transform

Spherical lenses

Free space

Optical character recognition

Fourier transforms

Binary data

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