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Dark-field techniques are successfully used in microscopy for increasing the contrast of almost transparent objects, and for edge detection by removing image components with low spatial frequencies. A removal of image components with little interesting information but high intensity yields a higher signal-to-noise ratio for the image components of interest. Here, we present a technique to enhance the signal-to-noise ratio of an image signature contained in a spatial asymmetry. While being an interferometric technique based on image inversion, it will work with incoherent light sources, and thus be applicable in many practical imaging scenarios. We experimentally demonstrate an increase of the signal-to-noise ratio in asymmetry detection by an order of magnitude in a proof-of-principle experiment.
Conference Presentation
(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Si Ying Foo, Ming Zhi Koh, Xi Jie Yeo, Jae Suk Hwang, Christian Kurtsiefer, Peng Kian Tan, "Dark-field separation of optical modes in a thermal point source," Proc. SPIE 12740, Emerging Imaging and Sensing Technologies for Security and Defence VIII, 127400A (17 October 2023); https://doi.org/10.1117/12.2675829