Conference Paper

Binary Synthetic Phase-Only Filter (BSPOF) With Random Mask

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Abstract

It has been shown that synthetic phase-only filter formed by using different plane wave carriers may provide very high optical efficiency and can produce very sharp correlation peaks in the case of multiobjects correlation recognition. Binarizing the synthetic phase-only filter (SPOF) would make filter making much more easy. But binary synthetic phase-only filter (BSPOF) would produce undesirable noise which mainly consists of convolution-like peaks in the output plane. These noise peaks may sometime rise very high especially when objects are symmetrical. In this paper a random phase mask placed close to the BSPOF in the Fourier plane is used in the correlation system. It can spread the energy of the noise peaks in the output plane. So that, there is no any obvious noise peaks presented, however, at the same time, the sharp correlation-like peaks of SPOF are remained very well. The computer simulation results are given. The comparison of the correlation outputs of BSPOF with that of SPOF is discussed. And 3-D plots of correlation output are presented.

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Article
Progress in Fourier optical processing techniques is reviewed. Particular emphasis is placed on real-time pattern recognition, which recently has received increased interest as the result of new filter formulations that can be implemented with existing spatial light modulators. Architectures for coherent optical correlation are reviewed, as are the recently reported phase-only filters. Smart filters that attack the inherent distortion sensitivity of correlation, including those suitable for implementation with phase-only modulation, are reviewed. Correlation experiments implementing real-time variation of both input and reference patterns are also reviewed. The potential for successful near-term application of these techniques is examined
Article
Full-text available
From image processing work, we know that the phase information is significantly more important than amplitude information in preserving the features of a visual scene. Is the same true in the case of a matched filter? From previous work [ Horner J. L. , Appl. Opt. 21, 4511( 1982)], we know that a pure phase correlation filter can have an optical efficiency of 100% in an optical correlation system. We examine this relationship between phase and amplitude in the case of alphanumeric characters, with and without noise, using a computer simulation. We compare the phase-only and amplitude-only filters to the classical matched filter using the criteria of discrimination, correlation peak, and optical efficiency. Three-dimensional plots of the autocorrelation and cross-correlation functions are presented and discussed.
A Synthetic Phase-only Holographic Filter for Multiobjects Recognition
  • X Y Su
  • G S Zhang
  • L R Gou
X.Y.Su, G.S.Zhang and L.R.Gou, "A Synthetic Phase-only Holographic Filter for Multiobjects Recognition," Proc. SPIE, Vol. 673, 1986