A Unified Framework for Multi-Sensor HDR Video Reconstruction

Joel Kronander, Stefan Gustavson, Gerhard Bonnet, Anders Ynnerman, Jonas Unger
Signal Processing : Image Communications, Volume 29, Number 2, page 203 -- 215 - 2014
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One of the most successful approaches to modern high quality HDR-video capture is to use camera setups with multiple sensors imaging the scene through a common optical system. However, such systems pose several challenges for HDR reconstruction algorithms. Previous reconstruction techniques have considered debayering, denoising, resampling (alignment) and exposure fusion as separate problems. In contrast, in this paper we present a unifying approach, performing HDR assembly directly from raw sensor data. Our framework includes a camera noise model adapted to HDR video and an algorithm for spatially adaptive HDR reconstruction based on fitting of local polynomial approximations to observed sensor data. The method is easy to implement and allows reconstruction to an arbitrary resolution and output mapping. We present an implementation in CUDA and show real-time performance for an experimental 4 Mpixel multi-sensor HDR video system. We further show that our algorithm has clear advantages over existing methods, both in terms of flexibility and reconstruction quality.

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BibTex references

@Article\{KGBYU14,
  author       = "Kronander, Joel and Gustavson, Stefan and Bonnet, Gerhard and Ynnerman, Anders and Unger, Jonas",
  title        = "A Unified Framework for Multi-Sensor HDR Video Reconstruction",
  journal      = "Signal Processing : Image Communications",
  number       = "2",
  volume       = "29",
  pages        = "203 -- 215",
  year         = "2014",
  note         = "acceoted for publication"
}

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