Parallel implementation of a real-time high dynamic range video system

Authors:
Benjamin Guthier;Stephan Kopf;Matthias Wichtlhuber;Wolfgang Effelsberg
Affiliations:
Department of Computer Science IV, University of Mannheim, Mannheim, Germany;Department of Computer Science IV, University of Mannheim, Mannheim, Germany;Peer-to-Peer Systems Engineering, University of Darmstadt, Darmstadt, Germany;Department of Computer Science IV, University of Mannheim, Mannheim, Germany
Venue:
Integrated Computer-Aided Engineering
Year:
2014

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Abstract

This article describes the use of the parallel processing capabilities of a graphics chip to increase the processing speed of a high dynamic range HDR video system. The basis is an existing HDR video system that produces each frame from a sequence of regular images taken in quick succession under varying exposure settings. The image sequence is processed in a pipeline consisting of: shutter speeds selection, capturing, color space conversion, image registration, HDR stitching, and tone mapping. This article identifies bottlenecks in the pipeline and describes modifications to the algorithms that are necessary to enable parallel processing. Time-critical steps are processed on a graphics processing unit GPU. The resulting processing time is evaluated and compared to the original sequential code. The creation of an HDR video frame is sped up by a factor of 15 on the average.