15 October 2012 Building a high dynamic range video sensor with spatially nonregular optical filtering
Author Affiliations +
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Schöberl, Michael Schöberl, Alexander Belz, Alexander Belz, Arne Nowak, Arne Nowak, Jürgen Seiler, Jürgen Seiler, André Kaup, André Kaup, Siegfried Foessel, Siegfried Foessel, } "Building a high dynamic range video sensor with spatially nonregular optical filtering", Proc. SPIE 8499, Applications of Digital Image Processing XXXV, 84990C (15 October 2012); doi: 10.1117/12.928858; https://doi.org/10.1117/12.928858
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Evaluation of a high dynamic range video camera with non...
Proceedings of SPIE (February 03 2013)
Frameless, time domain continuous image capture
Proceedings of SPIE (March 03 2014)
Frameless representation and manipulation of image data
Proceedings of SPIE (March 03 2015)
Thin digital imaging systems using focal plane coding
Proceedings of SPIE (February 01 2006)
High-dynamic-range imaging for digital still camera
Proceedings of SPIE (April 23 2002)
Suppressing moiré with lateral dispersion
Proceedings of SPIE (June 06 2004)

Back to Top