7 March 2014 Cost-effective multi-camera array for high quality video with very high dynamic range
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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 unachiev­ 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 in­crease 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 de­ 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.
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Joachim Keinert, Joachim Keinert, Marcus Wetzel, Marcus Wetzel, Michael Schöberl, Michael Schöberl, Peter Schäfer, Peter Schäfer, Frederik Zilly, Frederik Zilly, Michel Bätz, Michel Bätz, Siegfried Fößel, Siegfried Fößel, André Kaup, André Kaup, "Cost-effective multi-camera array for high quality video with very high dynamic range", Proc. SPIE 9023, Digital Photography X, 90230Y (7 March 2014); doi: 10.1117/12.2039563; https://doi.org/10.1117/12.2039563


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