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Cost-effective multi-camera array for high quality video with very high dynamic range

: Keinert, J.; Wetzel, M.; Schöberl, M.; Schäfer, P.; Zilly, F.; Bätz, M.; Fößel, S.; Kaup, A.


Sampat, N. ; Society for Imaging Science and Technology -IS&T-; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Digital photography X : 3 - 5 February 2014, San Francisco, California, United States; Proceedings
Bellingham, WA: SPIE, 2014 (Proceedings of SPIE 9023)
ISBN: 978-0-8194-9940-0
Paper 90230Y, 15 S.
Digital Photography Conference <10, 2014, San Francisco/Calif.>
Fraunhofer IIS ()

Temporal bracketing can create images with higher dynamic range than the underlying sensor. Unfortunately, moving objects cause disturbing artifacts. Moreover, the combination with high frame rates is almost unachievÂ-able since a single video frame requires multiple sensor readouts. The combination of multiple synchronized side-by-side cameras equipped with different attenuation filters promises a remedy, since all exposures can be performed at the same time with the same duration using the playout video frame rate. However, a disparity correction is needed to compensate the spatial displacement of the cameras. Unfortunately, the requirements for a high quality disparity correction contradict the goal to increase dynamic range. When using two cameras, disparity correction needs objects to be properly exposed in both cameras. In contrast, a dynamic range inÂ-crease needs the cameras to capture different luminance ranges. As this contradiction has not been addressed in literature so far, this paper proposes a novel solution based on a three camera setup. It enables accurate deÂ-termination of the disparities and an increase of the dynamic range by nearly a factor of two while still limiting costs. Compared to a two camera solution, the mean opinion score (MOS) is improved by 13.47 units in average for the Middleburry images.