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Proceedings Paper

Building a high dynamic range video sensor with spatially nonregular optical filtering
Author(s): Michael Schöberl; Alexander Belz; Arne Nowak; Jürgen Seiler; André Kaup; Siegfried Foessel
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Paper Abstract

Although we observe a steady progress in the development of High Dynamic Range Video (HDRV) technology, current image sensors are still lacking achievable dynamic range for high image quality applications. We propose a new imaging principle that is based on a spatial variation of optical Neutral Density (ND) filters on top of some pixels. In existing work, this method has been used to trade spatial resolution for an increase in dynamic range. We improve this approach by a non-regular placement of these filters. The non-regular sampling is an important step as any sub-sampling with regular patterns leads to aliasing. The non-regular patterns however preserve just a single dominant spatial frequency and enable an image reconstruction without aliasing. In combination with a new image reconstruction approach, we are able to recover image details at high resolution. The iterative reconstruction is based on the assumption that natural images can be represented with few coefficients in the Fourier domain. As typical natural images can be classified as near-sparse, the method enables the reconstruction of images of high objective and visual quality. In extension to theory and simulation of this method we want to present details on a practical implementation of our method. While building a demonstration system we encountered many challenges. This includes effects like crosstalk, aspects like sensor selection and mask fabrication as well as mounting of the masks.

Paper Details

Date Published: 15 October 2012
PDF: 11 pages
Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84990C (15 October 2012); doi: 10.1117/12.928858
Show Author Affiliations
Michael Schöberl, Univ. of Erlangen-Nürnberg (Germany)
Alexander Belz, Fraunhofer-Institut für Integrierte Schaltungen (Germany)
Arne Nowak, Fraunhofer-Institut für Integrierte Schaltungen (Germany)
Jürgen Seiler, Univ. of Erlangen-Nürnberg (Germany)
André Kaup, Univ. of Erlangen-Nürnberg (Germany)
Siegfried Foessel, Fraunhofer-Institut für Integrierte Schaltungen (Germany)

Published in SPIE Proceedings Vol. 8499:
Applications of Digital Image Processing XXXV
Andrew G. Tescher, Editor(s)

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