Nonuniform lattice regression for modeling the camera imaging pipeline

  • Authors:
  • Hai Ting Lin;Zheng Lu;Seon Joo Kim;Michael S. Brown

  • Affiliations:
  • National University of Singapore, Singapore;University of Texas at Austin;SUNY, Korea;National University of Singapore, Singapore

  • Venue:
  • ECCV'12 Proceedings of the 12th European conference on Computer Vision - Volume Part I
  • Year:
  • 2012

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Abstract

We describe a method to construct a sparse lookup table (LUT) that is effective in modeling the camera imaging pipeline that maps a RAW camera values to their sRGB output. This work builds on the recent in-camera color processing model proposed by Kim et al. [1] that included a 3D gamut-mapping function. The major drawback in [1] is the high computational cost of the 3D mapping function that uses radial basis functions (RBF) involving several thousand control points. We show how to construct a LUT using a novel nonuniform lattice regression method that adapts the LUT lattice to better fit the 3D gamut-mapping function. Our method offers not only a performance speedup of an order of magnitude faster than RBF, but also a compact mechanism to describe the imaging pipeline.