Image Preprocessing For Phase-Only Filtering

Samuel P. Kozaitis; Atikom Roeksabutr

doi:10.1117/12.962215

5 February 1990 Image Preprocessing For Phase-Only Filtering

Samuel P. Kozaitis, Atikom Roeksabutr

Proceedings Volume 1151, Optical Information Processing Systems and Architectures; (1990) https://doi.org/10.1117/12.962215
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

We compare the performance of an optical binary phase-only correlator using several nonlinear filters for preprocessing. An image of an airfield with different but similar appearing planes is used as the input data. The performance of the correlator was measured by examining several parameters in the correlation plane. Performance criteria are the signal-to-clutter ratio, the signal-to-noise ratio for objects within the same class, and the variance of the correlation peak within a class. Input images to the correlator were preprocessed using nonlinear filters based on both median filtering and adaptive filtering. The preprocessing improved the performance of the correlator by supressing noise while preserving the edges of the input image. The SNR changes with the position of an object due to diffraction from the pixels of a spatial light modulator.

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Samuel P. Kozaitis and Atikom Roeksabutr "Image Preprocessing For Phase-Only Filtering", Proc. SPIE 1151, Optical Information Processing Systems and Architectures, (5 February 1990); https://doi.org/10.1117/12.962215

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KEYWORDS

Digital filtering

Nonlinear filtering

Signal to noise ratio

Image segmentation

Phase only filters

Image filtering

Optical correlators

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