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Binary nonlinear joint transform correlator performance with different thresholding methods under unknown

B Javidi, J Li, A H Fazlollahi

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Binary joint transform correlators (BJTCs) show improved correlation performance with unknown illumination. A spatial frequency dependent thresholding method makes BJTCs invariant to uniform input-image light, confirmed by simulations and experiments.

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Correlation Systems

    Background:

    • Binary joint transform correlators (BJTCs) are widely used for pattern recognition.
    • Input-image illumination variations can degrade BJTC performance.
    • Binarization methods in the Fourier plane are crucial for BJTC operation.

    Purpose of the Study:

    • To investigate the correlation performance of BJTCs under unknown input-image illumination.
    • To evaluate different thresholding methods for Fourier plane binarization.
    • To identify a thresholding method that provides invariance to uniform illumination.

    Main Methods:

    • Analysis of binary joint transform correlator performance.
    • Implementation and testing of various thresholding techniques in the Fourier plane.
    • Computer simulations to model correlation outcomes.
    • Optical experimental validation of simulation results.

    Main Results:

    • Different thresholding methods exhibit varying effects on correlation performance.
    • A spatial frequency dependent threshold function was identified as effective.
    • This specific thresholding method renders the BJTC invariant to uniform input-image illumination.

    Conclusions:

    • The choice of thresholding method significantly impacts BJTC robustness to illumination changes.
    • Spatial frequency dependent thresholding offers a solution for illumination-invariant correlation.
    • Validated computer simulations and optical experiments confirm the findings.