Digital neutral density filter for moving picture cameras

Conference contribution
(Conference Contribution)


Publication Details

Author(s): Schöberl M, Oberdoerster A, Foessel S, Bloss H, Kaup A
Publication year: 2010
Volume: 7533
ISBN: 9780819479266
Language: English


Abstract


Typical image sensors in digital cameras have a fixed sensitivity, and the amount of captured light energy is often controlled by adjusting exposure time and lens aperture. For high end motion imaging these settings are not available as they are used to set motion blur and depth of field, respectively. In many cases a proper exposure is achieved with additional optical filtering, using so called "neutral density" (ND) filters. We propose a digital equivalent of a neutral density filter, which can replace the handling of optical filters for camera systems. It consists of an adjusted sensor readout and in-camera processing of images. Instead of a single long exposure we capture N short exposures. These images are then combined by averaging. The short exposures reduce the sensitivity by a factor of N, while averaging reconstructs motion blur. In addition we also achieve a reduction of both dynamic and fixed pattern noise which leads to an overall increase in dynamic range. The digital ND filter can be used with regular image sensors and does not require hardware modifications. © 2009 Copyright SPIE - The International Society for Optical Engineering.


FAU Authors / FAU Editors

Kaup, André Prof. Dr.-Ing.
Lehrstuhl für Multimediakommunikation und Signalverarbeitung
Schöberl, Michael
Lehrstuhl für Multimediakommunikation und Signalverarbeitung


How to cite

APA:
Schöberl, M., Oberdoerster, A., Foessel, S., Bloss, H., & Kaup, A. (2010). Digital neutral density filter for moving picture cameras. In Proceedings of the Computational Imaging VIII. San Jose, CA, US.

MLA:
Schöberl, Michael, et al. "Digital neutral density filter for moving picture cameras." Proceedings of the Computational Imaging VIII, San Jose, CA 2010.

BibTeX: 

Last updated on 2019-29-04 at 18:08