1 March 1994 Role of coherence in optical pattern recognition
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Abstract
Spatial coherence in optical processing can be exploited to implement a wide variety of image processing functions. While fully coherent systems tend to receive the most attention, spatially noncoherent systems can often provide equivalent functionality while offering significant advantages over coherent systems with regard to noise performance and system robustness. The term noncoherent includes both partially coherent and fully incoherent illumination. In addition to the noise immunity advantage, noncoherent diffraction-based processors have relaxed requirements on pupil plane spatial light modulator characteristics. In this paper we provide a discussion of the tradeoffs between coherent and noncoherent processing, taking into account the limited performance characteristics of commercially available spatial light modulators. The advantages of noncoherent processing are illustrated with numerical and experimental results corresponding to three different noncoherent architectures.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph van der Gracht, Joseph Neil Mait, Dennis W. Prather, Ravindra A. Athale, "Role of coherence in optical pattern recognition", Proc. SPIE 2237, Optical Pattern Recognition V, (1 March 1994); doi: 10.1117/12.169418; https://doi.org/10.1117/12.169418
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