Journal ArticleDOI
Digital phase-encoded inverse filter for optical pattern recognition.
TLDR
The calculation of a phase-encoded inverse filter allows compromises between discrimination capability and diffraction efficiency and phase quantization facilitates the materialization of the filter.Abstract:
Optical pattern recognition can profit from the progress in coding theory and technology that has been made in digital holography. The calculation of a phase-encoded inverse filter is described. This filter allows compromises between discrimination capability and diffraction efficiency. Phase quantization facilitates the materialization of the filter.read more
Citations
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Journal ArticleDOI
Digital holography as part of diffractive optics
Frank Wyrowski,Olof Bryngdahl +1 more
TL;DR: In this paper, the inverse problem of how to proceed from the desired wavefield in space to the design of a diffractive element that is able to form this field is treated by considering various approximations that define digital holography as a subset of diffractive optics.
Journal ArticleDOI
Understanding diffractive optic design in the scalar domain
TL;DR: In this paper, a general procedure for the design of diffractive optical elements is presented, and scalar diffraction theory is used to apply it to the design three common diffractive elements: a diffractive lens, an array generator and a correlation filter.
Journal ArticleDOI
Theory of speckles in diffractive optics and its application to beam shaping
TL;DR: In this paper, the influence of the phase of the signal wave on the design process of diffractive phase elements (DPEs) was examined and it was shown that depending on the application a pseudo-random or a spherical phase should be used as an initial phase for an iterative design procedure.
Journal ArticleDOI
Upper bound of the diffraction efficiency of diffractive phase elements
TL;DR: An upper bound of the diffraction efficiency of diffractive elements that only influence the phase of the illumination wave is derived and is independent of the technique to design and fabricate the diffractive element.
Journal ArticleDOI
Design theory of diffractive elements in the paraxial domain
TL;DR: The design theory presented in this paper describes characteristic features of thin diffractive elements and permits the derivation of upper bounds of the diffraction efficiency of diffraction elements. But these bounds are independent of the calculation method used to obtain the diffractive element.
References
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Journal ArticleDOI
Signal detection by complex spatial filtering
TL;DR: The experimental results obtained to date indicate that this technique provides an excellent two-dimensional filtering capability that will play a key role in such problems as shape recognition and signal detection.
Journal ArticleDOI
Phase-only matched filtering
TL;DR: This work examines the relationship between phase and amplitude in the case of alphanumeric characters, with and without noise, using a computer simulation and compares the phase-only and amplitude-only filters to the classical matched filter using the criteria of discrimination, correlation peak, and optical efficiency.
Journal ArticleDOI
Performance measures for correlation filters.
TL;DR: It is shown that the POF appears to provide a good compromise between noise tolerance and peak sharpness, with the help of a new family of filters called fractional power filters (FPFs).
Journal ArticleDOI
Iterative Fourier-transform algorithm applied to computer holography
Frank Wyrowski,Olof Bryngdahl +1 more
TL;DR: An iterative algorithm to determine phase distributions that can be manipulated to achieve a high diffraction efficiency, a small space–bandwidth product, and a speckle-free reconstruction is described.
Journal ArticleDOI
Iterative Method Applied To Image Reconstruction And To Computer-Generated Holograms
TL;DR: An iterative computer method that can be used to solve a number of problems in optics, including reconstruction of astronomical objects from stellar speckle interferometer data and spectrum shaping for computer-generated holograms to reduce quantization noise is discussed.
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Method for Computing Kinoforms that Reduces Image Reconstruction Error.
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