Recent advances in joint optical-digital design for optronics applications (Orale)
| Autor: | Fabrice Lemonnier, Mane-Si Laure Lee, Frédéric Diaz, Brigitte Loiseaux, François Goudail, Hervé Sauer, François Leprêtre, Philippe Millet, Anne Delboulbe, Marie-Anne Burcklen, François Duhem |
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| Přispěvatelé: | Laboratoire Charles Fabry / Spim, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Thales Angenieux, Thales Research and Technology [Palaiseau], THALES, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Aperture
Image quality Computer science ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Image processing 02 engineering and technology 01 natural sciences law.invention 010309 optics law Optical transfer function 0103 physical sciences Electronic engineering hybrid imaging system Computer vision Depth of field Image resolution wavefront coding Wavefront [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] business.industry Near-infrared spectroscopy joint optical-digital design 021001 nanoscience & nanotechnology Lens (optics) Artificial intelligence Deconvolution 0210 nano-technology business Night vision device Wavefront coding |
| Zdroj: | Proc. SPIE SPIE Defense + Commercial Sensing, Advanced Optics for Defense Applications: UV through LWIR SPIE Defense + Commercial Sensing, Advanced Optics for Defense Applications: UV through LWIR, Apr 2016, Baltimore, Maryland, United States. pp.98220E, ⟨10.1117/12.2219575⟩ |
| DOI: | 10.1117/12.2219575⟩ |
| Popis: | International audience; Increasing the capture volume of visible cameras while maintaining high image resolutions, low power consumption and standard video-frame rate operation is of utmost importance for hand-free night vision goggles or embedded surveillance systems. Since such imaging systems require to operate at high aperture, their optical design has become more complex and critical. Therefore new design alternatives have to be considered. Among them, wavefront coding changes and desensitizes the modulation transfer function (MTF) of the lens by inserting a phase mask in the vicinity of the aperture stop. This smart filter is combined with an efficient image processing that ensures optimal image quality over a larger depth of field. In this paper recent advances are discussed concerning design and integration of a compact imaging system based on wavefront coding. We address the design, the integration and the characterization of a High Definition (HD) camera of large aperture (F/1.2) operating in the visible and near infrared spectral ranges, endowed with wavefront coding. Two types of phase masks (pyramidal and polynomial) have been jointly optimized with their deconvolution algorithm in order to meet the best performance along an increased range of focus distances and manufactured. Real time deconvolution processing is implemented on a Field Programmable Gate Array. It is shown that despite the high data throughput of an HD imaging chain, the level of power consumption is far below the initial specifications. We have characterized the performances with and without wavefront coding through MTF measurements and image quality assessments. A depth-of- field increase up to x2.5 has been demonstrated in accordance with the theoretical predictions. |
| Databáze: | OpenAIRE |
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