Moving refractive optical low-pass filter for digital cameras

Schöberl M, Ernst J, Schnurrer W, Fößel S, Kaup A (2011)

Publication Language: English

Publication Status: Published

Publication Type: Conference contribution, Conference Contribution

Publication year: 2011

Book Volume: 7876

Article Number: 78760Z

Event location: San Francisco, CA US

ISBN: 9780819484130

DOI: 10.1117/12.872402

Abstract

As with any sampling process, image acquisition is subject to spatial domain aliasing. Many designs of optical filters have been proposed that reduce the amount of aliasing in image acquisition. Still, the most common systems are based on birefringent optical materials. Unfortunately, these filters are expensive and the actual filter response curve can only partially be influenced. We propose a new refractive optical low-pass filter (ROLPF) based on refraction at a structured glass plate. The transparent plate features a single surface with a defined structure. This leads to refraction and will lead to a modified light distribution on the sensor. The plate is placed in front of the sensor and is moved in the image sensor plane during an exposure. This causes an averaging process and results in a spatial domain filtering. The response curve of this setup can be controlled by designing the gradient of the surface. This filter will be easy to manufacture, it offers a true low-pass characteristic which can be specifically designed and the bandwidth can be adjusted at runtime by variation of the distance to the sensor. © 2011 SPIE-IS&T.

Authors with CRIS profile

Michael Schöberl Lehrstuhl für Multimediakommunikation und Signalverarbeitung Jan Ernst Technische Fakultät Wolfgang Schnurrer Lehrstuhl für Multimediakommunikation und Signalverarbeitung Andre Kaup Lehrstuhl für Multimediakommunikation und Signalverarbeitung

How to cite

APA:

Schöberl, M., Ernst, J., Schnurrer, W., Fößel, S., & Kaup, A. (2011). Moving refractive optical low-pass filter for digital cameras. In Proceedings of the SPIE Electronic Imaging - Digital Photography VII. San Francisco, CA, US.

MLA:

Schöberl, Michael, et al. "Moving refractive optical low-pass filter for digital cameras." Proceedings of the SPIE Electronic Imaging - Digital Photography VII, San Francisco, CA 2011.

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